Vitamins & Supplements · Collagen
Bovine Collagen (Types I and III)
Hydrolysed type I and III collagen from cattle · also called Beef collagen, cow collagen, bovine collagen peptides, colágeno bovino, colágeno de res
Bovine collagen is a protein from cattle hide and bone, usually sold as small collagen peptides in powders, capsules and drinks. Pooled trials of collagen from all animals found small skin gains over about 90 days and less knee pain, but bovine collagen was rarely studied alone and several trials were run by makers. The main cautions are beef, gelatin and alpha-gal allergy, and labels that may not match the real source.
General information, not medical advice. Last substantive update · Not medically reviewed. A named clinician has not signed off on this page. How this page is made
About Bovine Collagen (Types I and III)
Bovine collagen is a protein from cattle hide and bone. Trials show small skin and knee-pain gains with low certainty, mostly for collagen in general. Beef, gelatin and alpha-gal allergy are the key risks, and 'types I and III' and 'grass-fed' are unproven label words.
What bovine collagen is
Bovine collagen is collagen from cattle. Papers read describe it as made from hide (skin) and bone. It is usually broken into small pieces called peptides (hydrolysed) so that it dissolves in drinks.
The labels 'types I and III' name the two main structural collagens in the body: type I gives strength and type III forms an elastic network. That describes body tissue. No source read shows that a product labelled this way works differently. Gelatin is a related, partly broken-down form of collagen.
Beef, gelatin and alpha-gal allergy come first
Bovine type I collagen is a known allergen in people allergic to bovine gelatin. In one laboratory study, 13 of 15 children who had reacted to vaccines containing bovine gelatin had IgE against the same part of the bovine collagen chain. Case reports describe anaphylaxis after jelly candy with bovine gelatin and after a bovine gelatin surgical product, with IgE to bovine collagen.
Alpha-gal syndrome, a tick-linked allergy to mammal meat, can also involve gelatin and other cow-derived products, often with a delay of 2 to 6 hours. If you have any of these, ask an allergist before using cow-derived collagen.
What the research shows
For skin, pooled analyses of hydrolysed collagen from mixed sources found better hydration and elasticity than placebo over about 90 days, but most trials were high risk of bias and bovine collagen was not separated out. For knee osteoarthritis, a 2023 pooled analysis of four trials found less pain, and two bovine-based trials reported benefit but were linked to a gelatin maker.
For bone, one 12-month trial and a 2025 pooled analysis reported small gains with very uneven results. For muscle, one small trial in older men found extra gains with strength training. In these studies the animal source was not stated, so they cannot be assumed to apply to bovine collagen.
Labels, grass-fed claims and BSE
A 2024 laboratory study of collagen supplements found the collagen content adequate, but some labels did not match the origin found. No source read tested whether 'grass-fed' changes purity or safety, so treat it as a marketing word unless the maker shows test results.
In 2024 the European Food Safety Authority judged it almost certain (99 to 100 percent) that eating gelatine or collagen made from ruminant bones under EU rules would not create a new BSE case in cattle or small ruminants. It said the risk to people cannot be read directly from exposure because the human barrier is not quantified, though it is considered substantial.
Food versus pills
Trial results are for hydrolysed collagen products, not for eating beef or bone broth. No collagen amounts per portion of beef or bone broth were found, and no trial compared foods with pills. This page gives no amounts to take; if you wonder about your own needs, ask a doctor, pharmacist or dietitian.
At a glance
Traditional uses history, not proof
- A by-product of beef production turned into a supplement
- Sold for skin, joints and bones
Studied for research
- Skin hydration and elasticity, low certainty (collagen from all sources)
- Knee osteoarthritis pain, low certainty
- Bone density, low certainty
- Muscle with strength training, low certainty
- 'Types I and III' and 'grass-fed' claims, insufficient evidence
Main compounds
- Type I collagen
- Type III collagen
- Collagen peptides (hydrolysate)
- Hydroxyproline
Common forms
- Powders and drinks
- Capsules and tablets
- Gelatin as a related food ingredient
Research links: 2023 review: oral collagen for skin anti-aging (26 trials) · 2023 pooled analysis: collagen peptide for knee osteoarthritis pain · 2024 EFSA opinion: BSE risk from ruminant collagen and gelatine · 2024 lab study: collagen supplement labels and origin · 2002 study: allergy to bovine type I collagen in children · Research Library · Genes & Biomarkers Library
What it is and its history
- Accepted scientific name
- Bovine collagen (hydrolysed collagen from cattle hide and bone; types I and III named on labels)
- Common names
- Bovine collagen (English); Beef collagen (English); Cow collagen (English); Bovine collagen peptides (English); Colágeno bovino (Spanish); Colágeno de res (Spanish)
- Family or group
- Structural protein. Collagen I gives tissues tensile strength and collagen III forms an elastic network (2023 review).
- Harvest and processing
- Papers read describe skin- and hide-derived hydrolysates from cattle (two molecular weights, 2,000 and 5,000 Da) and gelatine or collagen made from ruminant bones under EU rules. Extraction details were not read.
- Look-alikes and adulterants
- Name: Gelatin; Note: Partly broken-down (denatured) type I collagen, mostly from cattle or pigs. It has its own page.; Name: Marine, chicken or pork collagen; Note: Other animal sources. They have their own pages.; Name: Multi-collagen blends; Note: Products that combine several collagen types and sources.
- Sustainability and conservation
- Not assessed.
What is inside, and how it may work
What it contains and how those compounds act in cells and animals. Laboratory and animal mechanisms are not proven effects in people.
Main compounds
| Compound | Family | Where it is concentrated | Activity studied | Level of evidence |
|---|---|---|---|---|
| Type I collagen | structural protein | Cattle hide and bone Not read from a source. | Gives tissues tensile strength; the bovine alpha2 chain is a known allergen in bovine gelatin allergy. 15 6 | Human data |
| Type III collagen | structural protein | Cattle hide Not read from a source. | Forms an elastic network in tissues (review of body tissue, not of supplements). 15 | Human data |
| Collagen peptides (hydrolysate) | protein fragments | Cattle hide and bone Not read from a source. | The form used in supplement trials; small hydroxyproline-containing peptides appear in blood after a dose. 17 9 3 | Human data |
| Hydroxyproline | amino acid | All collagen Not read from a source. | Collagen's characteristic amino acid; the body can turn some into oxalate. 7 | Human data |
Mechanisms, receptors and pathways
| Target or pathway | Gene or receptor | What was found | Level |
|---|---|---|---|
| IgE binding to bovine collagen | IgE antibodies | IgE from children allergic to bovine gelatin bound a 10-amino-acid stretch of the bovine type I alpha-2 chain, absent from human type I chains. 6 | Human data |
| Absorption of collagen peptides | Not specified | After a single dose, blood hydroxyproline rose similarly for fish, pig and cattle hydrolysates, showing small hydroxyproline-containing peptides are taken up. 17 | Human data |
| Oxalate production from hydroxyproline | Not specified | Gelatin raised urine glycolate and oxalate in healthy people, so hydroxyproline appears to feed oxalate production. 7 | Human data |
Absorption, metabolism and elimination
- Absorption
- After a single dose in healthy volunteers, cattle, pig and fish hydrolysates all raised blood hydroxyproline; total hydroxyproline was higher than free, showing hydroxyproline-containing small peptides are taken up.
- Distribution
- Not read.
- Metabolism
- Hydroxyproline can be converted toward glycolate and oxalate (gelatin feeding study).
- Elimination
- Urine oxalate and glycolate rose after gelatin in that study.
- Bioavailability
- Comparable across source and molecular weight for the markers measured; larger studies are needed (per the authors).
Isolated compounds versus whole extracts
Eating beef, bone broth or gelatin is different from taking collagen peptide powder. Trials use hydrolysed collagen products, not foods. No trial read compared foods with pills, and no collagen amounts per portion of beef or bone broth were read from USDA or NIH ODS.
Nutritional composition
Collagen is a protein that lacks tryptophan. No USDA or NIH ODS values for collagen per portion of beef, hide or bone broth were read, so none is given.
4 low certainty2 not enough evidence
What was looked at
The 6 benefits and uses checked for Bovine Collagen (Types I and III), each with how strong the evidence is. Tap one to open it.
- Skin hydration and elasticityLow certainty
- Knee osteoarthritis pain and functionLow certainty
- Bone densityLow certainty
- Muscle mass and strength (with exercise)Low certainty
- Collagen as a protein sourceNot enough evidence
- "Types I and III" and "grass-fed" claimsNot enough evidence
Lab markers tracked in the studies
Skin hydrationSkin elasticityKnee pain scoreBone mineral densityFat-free mass
What is Bovine Collagen (Types I and III) good for?
The main studied uses and how strong the human evidence is for each. Most results are for collagen from several animals, and cow-only trials are few.
Benefits, one by one
Each card is a research question, not a promise. Tap a goal to filter. Open a card to see the studies, doses and limits.
Skin hydration and elasticity
Low certaintyPooled trials of hydrolysed collagen from all animal sources found small gains in skin hydration and elasticity over about 90 days. None of the reviews separated out cow (bovine) collagen, and most included trials were rated high risk of bias. So the result is for collagen in general, not proven for bovine collagen on its own.
3 studiesStudied form: hydrolysed (broken-down) collagen peptides taken by mou…
Studies, doses and limits
What the trials found
Three reviews of hydrolysed collagen from mixed sources: 26 trials with 1,721 people (2023) found better hydration than placebo, with results that varied by source and length of use, and no clear difference between sources for elasticity. 19 trials with 1,125 people (2021, 95% women) found better hydration, elasticity and wrinkles after about 90 days. A 2026 review of 25 trials counted hydration better in 10 of 15 trials, elasticity in 10 of 13 and wrinkles in 9 of 10, and rated most trials high risk of bias. No trial of bovine collagen alone on skin was found in the searches done for this page.
Results
Probably a small improvement in skin measurements after about 3 months, mostly in women. It is not shown that bovine collagen does better or worse than other collagen. It does not replace sun protection.
Effect sizes as reported
Direction and counts of trials, not one number.
Why this rating
Pooled results from all collagen sources lean positive, but most trials were high risk of bias and bovine collagen was not studied separately. Rated low for bovine collagen.
Form and dose studied
Studied form: hydrolysed (broken-down) collagen peptides taken by mouth; trial amounts appear in the studies table only.
Who was studied
Mostly women, healthy adults aged 20 to 70. Not well studied in men or in people with skin disease.
Limits
Trials differ in product, amount, source and measuring method. Several are tied to makers.
Why researchers looked
People buy bovine collagen hoping for firmer, smoother skin as they age.
Traditional use
Bovine collagen is collagen from cattle hide and bone. The skin claims are modern supplement marketing; what matters here is what trials found.
Proposed mechanism Not established
The abstracts read do not show how eaten collagen would act in the skin of people.
A proposed mechanism does not show that the effect happens in people.
Mostly mild or no side effects in these trials. Allergy to beef or gelatin is a real risk; see the Safety tab.
Knee osteoarthritis pain and function
Low certaintyA pooled analysis of four trials found less knee pain with collagen peptides than placebo, but all four trials were at high risk of bias. Two trials of bovine-based peptides (one with pork skin and bovine bone, one with a branded bovine peptide) were run or paid for by the maker and reported benefits.
3 studiesStudied forms: collagen peptides from bovine bone or hide taken by mo…
Studies, doses and limits
What the trials found
A 2023 pooled analysis of 4 trials with 507 people found less pain with collagen peptides than placebo (standardised mean difference -0.58, 95% CI -0.98 to -0.18) with big differences between trials; all four were at high risk of bias, and the source of collagen was not separated. A 13-week trial gave peptides from pork skin or bovine bone and reported lower WOMAC, pain and quality-of-life scores than placebo; the lead author works for a gelatin maker and group sizes are not in the abstract. A 2024 trial in 100 adults tested a branded bovine peptide against a conventional bovine peptide and placebo for 90 days and reported benefit with all collagen arms; it was run by the product's maker and the abstract gives no numbers.
Results
Probably some pain relief in studies, but the evidence is thin and much of it comes from makers of the product. It is not shown that bovine collagen works better than other collagen or that it slows joint damage.
Effect sizes as reported
Pooled pain effect: standardised mean difference -0.58 (a medium-sized difference), with I2 of 68% (large differences between trials).
Why this rating
The authors of the pooled analysis graded pain moderate, but every trial was high risk of bias, there are only four, and the bovine-specific trials are industry-run. Rated low here.
Form and dose studied
Studied forms: collagen peptides from bovine bone or hide taken by mouth for 13 weeks to 90 days; amounts appear in the studies table only.
Who was studied
Adults with knee osteoarthritis. Not studied in other joints.
Limits
Few trials, high risk of bias, industry links, and mixed or unstated sources.
Why researchers looked
Knee osteoarthritis causes pain and stiffness, and collagen is a main protein of joint tissue.
Traditional use
Bovine collagen and gelatin come from cattle bone and hide. Joint claims are modern supplement marketing.
Proposed mechanism Preliminary mechanism
One trial abstract says collagen peptides are absorbed and reach joint tissues in earlier studies; the abstracts read do not test how they would ease pain in people.
A proposed mechanism does not show that the effect happens in people.
The pooled analysis found no clear difference in side effects versus placebo, but the interval just reaches 1 (odds ratio 1.66, 95% CI 0.99 to 2.78) and the evidence was very low certainty.
Bone density
Low certaintyOne 12-month trial in postmenopausal women and a 2025 pooled analysis reported small gains in bone density with collagen peptides, but results differed a lot between trials and the animal source was not stated.
2 studiesStudied form: collagen peptides by mouth for 12 months; amounts in th…
Studies, doses and limits
What the trials found
The 12-month trial in 131 postmenopausal women (102 finished) found spine T-score +0.1 with collagen versus -0.03 with placebo (p = 0.030) and femoral neck +0.09 versus -0.01 (p = 0.003), with a rise in a bone-building marker. A 2025 pooled analysis found higher spine and femoral neck density with collagen peptides but very uneven results (I2 = 80.1%); the number of trials is not in the abstract.
Results
Possibly a small gain in bone density in postmenopausal women. Neither source says the collagen was bovine, and fractures were not shown to fall.
Effect sizes as reported
Spine T-score change +0.1 versus -0.03; femoral neck +0.09 versus -0.01 (a small difference).
Why this rating
One trial, small changes, very uneven pooled results and links to collagen companies; animal source not stated.
Form and dose studied
Studied form: collagen peptides by mouth for 12 months; amounts in the studies table only.
Who was studied
Mostly postmenopausal women with reduced bone density. Not studied in men or younger people.
Limits
Source not stated, uneven results, possible industry links.
Why researchers looked
Bone is built on a collagen framework, so collagen has been tested for bone loss after menopause.
Traditional use
Bone broth and gelatin are traditional foods; the bone claims for supplements are modern.
Proposed mechanism Preliminary mechanism
The trial abstract says earlier rodent and test-tube work suggested collagen peptides help bone formation; this is lab and animal evidence.
A proposed mechanism does not show that the effect happens in people.
No side-effect details in the abstracts.
Muscle mass and strength (with exercise)
Low certaintyIn one small trial of older men with age-related muscle loss, collagen peptides plus strength training gave more muscle and strength gain than placebo plus training. The source animal was not stated.
2 studiesStudied form: collagen peptides by mouth after training for 12 weeks;…
Studies, doses and limits
What the trials found
A 12-week trial of 53 men aged about 72 with sarcopenia compared 15 g a day of collagen peptides with silica placebo, both with supervised training. Fat-free mass rose 4.2 kg versus 2.9 kg, leg strength 16.5 versus 7.3 Nm, and fat mass fell 5.4 versus 3.5 kg (each P < 0.05). The 2025 pooled analysis also reported muscle performance gains (SMD 0.60, 95% CI 0.05 to 1.15).
Results
Possibly helps older men gain a bit more muscle when also doing strength training. Not shown without training, in women, or for bovine collagen specifically.
Effect sizes as reported
Fat-free mass 1.3 kg more than placebo group; pooled muscle performance SMD 0.60.
Why this rating
One small trial in older men plus a pooled analysis with wide range; authors linked to a collagen research company.
Form and dose studied
Studied form: collagen peptides by mouth after training for 12 weeks; amounts in the studies table only.
Who was studied
Older men with sarcopenia.
Limits
Small, single group, an erratum exists for the trial paper (not read).
Why researchers looked
Protein plus exercise builds muscle, and collagen is a protein.
Proposed mechanism Not established
Not described in the abstract read.
A proposed mechanism does not show that the effect happens in people.
None reported in the abstract.
Collagen as a protein source
Not enough evidenceCollagen lacks one essential amino acid (tryptophan), so it counts as an incomplete protein. A calculation estimated collagen peptides could replace up to about 36% of daily protein and still meet essential amino acid needs.
1 studiesNot applicable.
Studies, doses and limits
What the trials found
No trial in people. A modelling study using the PDCAAS protein score found up to 36% of daily protein could be collagen peptides while meeting essential amino acid needs; two authors have ties to collagen makers.
Results
Information only: collagen is a weak protein by itself. This is not a benefit claim.
Effect sizes as reported
Model result: 36% of protein.
Why this rating
A calculation by authors with industry ties, no human outcome.
Who was studied
A model of a Western-pattern diet.
Limits
Calculation only.
Why researchers looked
People ask if collagen powder can count as their protein.
Proposed mechanism Not established
A scoring calculation of amino acid balance, not a study in people.
A proposed mechanism does not show that the effect happens in people.
Not applicable.
"Types I and III" and "grass-fed" claims
Not enough evidenceTypes I and III are the two main structural collagens in the body. No source read shows that a product labelled "types I and III" or "grass-fed" works better, is purer or is safer than one without those words.
2 studiesNot applicable.
Studies, doses and limits
What the trials found
No trial compared "types I and III" or "grass-fed" bovine collagen with other collagen. A 2024 laboratory study found collagen content in supplements was adequate but some labels did not match the origin found.
Results
Treat these as marketing words unless a maker shows test results. Eating collagen does not mean it is built into your own tissue in the same form.
Why this rating
No study tested these claims.
Limits
Number of products tested and which mismatched is not in the abstract.
Why researchers looked
Labels often name collagen types and farming terms, and people wonder if they matter.
Proposed mechanism Not established
A review says collagen I gives tensile strength and collagen III forms an elastic network in tissues. That describes the body, not supplements.
A proposed mechanism does not show that the effect happens in people.
See label accuracy on the Safety tab.
Connections to the rest of health
How Bovine Collagen (Types I and III) connects to the rest of our health knowledge graph. Every link says what kind of connection it is. A safety link (for example to the liver) is a warning, not a benefit. A study that merely mentions a topic never creates a benefit link.
Explore every connection: goals, body systems, organs, symptoms, genes
A. Wellness goals
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Healthy Skin | Low certainty | Skin hydration and elasticity: Pooled trials of hydrolysed collagen from all animal sources found small gains in skin hydration and elasticity over about 90 days. None of the reviews separated out cow (bovine) collagen, and most included trials were rated high risk of bias. So the result is for collagen in general, not proven for bovine collagen on its own. | 13 20 1 | |
| Anti Aging Support | Low certainty | Skin hydration and elasticity: Pooled trials of hydrolysed collagen from all animal sources found small gains in skin hydration and elasticity over about 90 days. None of the reviews separated out cow (bovine) collagen, and most included trials were rated high risk of bias. So the result is for collagen in general, not proven for bovine collagen on its own. | 13 20 1 | |
| Joint Support | Low certainty | Knee osteoarthritis pain and function: A pooled analysis of four trials found less knee pain with collagen peptides than placebo, but all four trials were at high risk of bias. Two trials of bovine-based peptides (one with pork skin and bovine bone, one with a branded bovine peptide) were run or paid for by the maker and reported benefits. | 11 9 3 | |
| Mobility Support | Low certainty | Knee osteoarthritis pain and function: A pooled analysis of four trials found less knee pain with collagen peptides than placebo, but all four trials were at high risk of bias. Two trials of bovine-based peptides (one with pork skin and bovine bone, one with a branded bovine peptide) were run or paid for by the maker and reported benefits. | 11 9 3 | |
| Bone Health | Low certainty | Bone density: One 12-month trial in postmenopausal women and a 2025 pooled analysis reported small gains in bone density with collagen peptides, but results differed a lot between trials and the animal source was not stated. | 10 16 | |
| Muscle Recovery | Low certainty | Muscle mass and strength (with exercise): In one small trial of older men with age-related muscle loss, collagen peptides plus strength training gave more muscle and strength gain than placebo plus training. The source animal was not stated. | 19 16 | |
| Muscle Recovery | Not enough evidence | Collagen as a protein source: Collagen lacks one essential amino acid (tryptophan), so it counts as an incomplete protein. A calculation estimated collagen peptides could replace up to about 36% of daily protein and still meet essential amino acid needs. | 12 | |
| Healthy Skin | Not enough evidence | "Types I and III" and "grass-fed" claims: Types I and III are the two main structural collagens in the body. No source read shows that a product labelled "types I and III" or "grass-fed" works better, is purer or is safer than one without those words. | 15 8 |
B. Body systems
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Skin Hair Beauty | Biological association | Low certainty | Studied for: Skin hydration and elasticity | 13 20 1 |
| Integumentary System | Biological association | Low certainty | Studied for: Skin hydration and elasticity Studied for: "Types I and III" and "grass-fed" claims | 13 20 1 15 8 |
| Bones Joints Muscles | Biological association | Low certainty | Studied for: Knee osteoarthritis pain and function Studied for: Bone density | 11 9 3 10 16 19 12 |
| Musculoskeletal System | Biological association | Low certainty | Studied for: Knee osteoarthritis pain and function | 11 9 3 |
E. Health conditions
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Alpha-gal syndrome | Adverse effect or risk | Review | Gelatin and other products from non-primate mammals can trigger reactions in alpha-gal syndrome. Gelatin and other cow-derived products can trigger reactions in alpha-gal syndrome. Preparation or compound: Gelatin and cow-derived products |
18 14 |
| Beef and gelatin allergy | Adverse effect or risk | Case reports and laboratory studies | Bovine type I collagen is a known allergen in people allergic to bovine gelatin. Preparation or compound: Bovine gelatin and bovine type I collagen |
6 5 2 |
| Kidney stones (calcium oxalate) | Drug or supplement interaction | Controlled feeding study | Gelatin raised urine oxalate in healthy people; stones were not studied. Preparation or compound: Hydroxyproline from gelatin |
7 |
| Skin ageing | Preliminary | Small gains in hydration and elasticity in pooled trials of collagen from all sources; low certainty. Preparation or compound: Hydrolysed collagen |
13 1 | |
| Knee osteoarthritis | Preliminary | Lower pain scores in four high-risk-of-bias trials; low certainty. Preparation or compound: Collagen peptides |
11 9 |
I. Biomarkers
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Skin hydration | Biological association | Low certainty | Measured in trials: higher with collagen in most pooled analyses. A lab change is not the same as a health benefit. | 13 1 |
| Skin elasticity | Biological association | Low certainty | Measured in trials: higher with collagen in most trials. A lab change is not the same as a health benefit. | 13 1 |
| Knee pain score | Biological association | Low certainty | Measured in trials: lower with collagen peptides in the trials read. A lab change is not the same as a health benefit. | 11 9 3 |
| Bone mineral density | Biological association | Low certainty | Measured in trials: slightly higher with collagen peptides in the trials read. A lab change is not the same as a health benefit. | 10 16 |
| Fat-free mass | Biological association | Low certainty | Measured in trials: higher with collagen peptides plus training. A lab change is not the same as a health benefit. | 19 |
K. Biological pathways
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Type I collagen alpha-2 chain (bovine) | Preliminary mechanism | Human | A major IgE-binding region of bovine gelatin allergy lies in this chain. | 6 |
L. Active compounds
| Connected to | Kind of connection | Evidence status | Context | Studies |
|---|---|---|---|---|
| Type I collagen | Biological association | Human | Gives tissues tensile strength; the bovine alpha2 chain is a known allergen in bovine gelatin allergy. Preparation or compound: Cattle hide and bone |
15 6 |
| Type III collagen | Biological association | Human | Forms an elastic network in tissues (review of body tissue, not of supplements). Preparation or compound: Cattle hide |
15 |
| Collagen peptides (hydrolysate) | Biological association | Human | The form used in supplement trials; small hydroxyproline-containing peptides appear in blood after a dose. Preparation or compound: Cattle hide and bone |
17 9 3 |
| Hydroxyproline | Biological association | Human | Collagen's characteristic amino acid; the body can turn some into oxalate. Preparation or compound: All collagen |
7 |
Each connection is stored with the ingredient, the connected record, the kind of connection, the evidence status, the supporting studies, the preparation or compound involved, and a review date (last reviewed October 26, 2026).
Evidence at a glance: what the research found for 6 outcomes
Each outcome below is one thing researchers measured. Certainty is how far the evidence can be trusted, not how well it works. The full studies are on the next tab.
The evidence
The research centre for Bovine Collagen (Types I and III). Every record here was checked against PubMed or the publisher's page; we never list a study we have not verified.
Evidence by outcome
Bars show how many studies we found for each outcome, not how well it works. People are added up across trials only (reviews are not added, to avoid double counting).
How we rate evidence
High certainty
Several well-run trials or reviews agree; further research is unlikely to change the picture much.
Moderate certainty
Good trials point the same way, but some doubt remains.
Low certainty
Small, short or inconsistent trials. The finding could change with better research.
Very low certainty
Very little or very weak human data. Treat as a possibility only.
Mixed findings
Trials or reviews disagree with each other.
Not enough evidence
Not enough human research to say either way.
Evidence against
Good research found no benefit, or found harm.
We take the reviewers' own risk-of-bias and GRADE statements where they exist, and otherwise judge from study size, design, consistency, directness and whether a product matches what is sold. Many publications do not make evidence high. Method note: We searched PubMed for trials, reviews, allergy studies and regulator opinions on bovine collagen, checked each title with PubMed's summary record and read each abstract. Only abstracts were read. The CDC alpha-gal page returned an access-denied error and is marked unread.
Study library: every study we checked 21
| Study | Design | People | Product, dose, length | Result |
|---|---|---|---|---|
| Bassila 2026 Efficacy and safety of hydrolyzed collagen supplementation on skin health outcomes: a systematic literature review of randomized controlled trials. Eur J Clin Nutr · PMID 42342959 · DOI |
Systematic review |
25 randomised trials (13 to 236 people each); mostly healthy volunteers, 7 in people with chronic conditions | Hydrolysed collagen (several sources) Oral supplement Varied · vs Placebo or active comparators |
Hydration improved over placebo in 10 of 15 trials, elasticity in 10 of 13, and wrinkle depth or volume in 9 of 10. Water loss results were less consistent. Generally well tolerated with a low rate of side effects. Most trials were at high risk of bias. Counts of trials, not one pooled number. (Not applicable (descriptive review).) Methods, limits and fundingOutcomes: Hydration, elasticity, wrinkles, water loss, safety, quality of life Limitations: Most included trials were rated high risk of bias; the authors call for larger, longer trials. Bovine collagen is not separated out in the abstract. Funding and conflicts: One author is an employee of Lumanity; he states no conflict specific to this review. Read: abstract |
| Coury 2022 Intraoperative Anaphylaxis to the Bovine Flowable Gelatin Matrix: A Report of 2 Cases. JBJS Case Connect · PMID 35239550 · DOI |
Case report |
2 Two young patients having spine surgery, with no known bovine or gelatin allergy |
A bovine gelatin product placed in the surgical site Surgical material Single events |
Both patients had life-threatening anaphylaxis, treated successfully. Blood tests were positive for IgE to beef, pork, bovine collagen and porcine collagen. Two cases. (Not applicable.) Methods, limits and fundingOutcomes: Anaphylaxis Limitations: Two cases with an injected surgical product, not an oral supplement. It shows bovine collagen can trigger severe allergy. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Devasia 2024 Management and Amelioration of Knee Joint Osteoarthritis in Adults Using a Novel High-Functional Bovine Collagen Peptide as a Nutritional Therapy: A Double-Blind, Prospective, Multicentric, Randomized, Active and Placebo Controlled, Five-Arm, Clinical Study to Evaluate the Efficacy, Safety, and Tolerability. Cartilage · PMID 38235711 · DOI |
Randomised controlled trial |
100 Adults with knee osteoarthritis, five groups |
A branded bovine collagen peptide (three amounts), a conventional bovine collagen peptide, and placebo Oral supplement 2.5 g, 5.0 g and 10.0 g of the branded peptide; 10.0 g conventional peptide; 10.0 g placebo 90 days · vs Placebo and a conventional bovine collagen peptide |
The branded peptide at 2.5 g improved WOMAC, quality of life, the blood marker and MRI score, and was reported as equal to 10 g of conventional peptide. All collagen arms were called beneficial. Qualitative; numbers are not in the abstract. (Not given in the abstract.) Methods, limits and fundingOutcomes: WOMAC, pain scale, quality of life, physician impression, a blood cartilage marker (CTX-II), MRI knee score Limitations: Tested a maker's own branded product against a conventional peptide; the abstract gives no numbers. Funding and conflicts: Industry funded and run by the product's maker: the authors work for Nitta Gelatin, which owns the brand. Read: abstract |
| EFSA Panel on Biological Hazards (Koutsoumanis 2024 BSE risk posed by ruminant collagen and gelatine derived from bones. EFSA J · PMID 39015303 · DOI |
Risk assessment model |
Model of one BSE-infected animal in a small batch of gelatine made from ruminant bones | Gelatine and collagen made from cattle, sheep or goat bones, made under EU rules Bones |
The probability that no new BSE case would arise in cattle or small ruminants through eating gelatine made from ruminant bones is 99 to 100 percent (almost certain), and the conclusion also holds for collagen. Infectivity exposure in people cannot be turned directly into disease risk because the human transmission barrier is not quantified, though it is considered substantial. 99% to 100% (EFSA wording: almost certain). (Not applicable.) Methods, limits and fundingOutcomes: Probability of new BSE cases in cattle or small ruminants from oral exposure Limitations: A model based on current knowledge, disease levels and EU practices; the conclusion is about cattle and small ruminants, and for people it gives no number. It covers EU production rules. Funding and conflicts: EFSA scientific panel; interests declarations are available from EFSA. Read: abstract |
| Gungor 2013 Anaphylaxis Provoked by Bovine Gelatin Caused by Ingestion of Jelly Candy and Using Hair Gel. Pediatr Allergy Immunol Pulmonol · PMID 35927840 · DOI |
Case report |
1 One patient |
Bovine gelatin in jelly candy and in hair gel Foods and a cosmetic Single events |
A patient had an anaphylactic reaction after eating jelly candy containing bovine gelatin and after using hair gel. The authors note gelatin allergy to foods was thought to be rare. One reported case. (Not applicable.) Methods, limits and fundingOutcomes: Allergic reaction Limitations: A single case; it shows reactions can happen, not how often. Not a collagen supplement. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Hori 2002 Analysis of the major epitope of the alpha2 chain of bovine type I collagen in children with bovine gelatin allergy. J Allergy Clin Immunol · PMID 12373276 · DOI |
Laboratory study laboratory |
15 15 children who had had allergic reactions to vaccines and had high IgE to bovine gelatin |
Bovine type I collagen (alpha2 chain) pieces Blood tests |
Gelatin is mostly denatured type I collagen. 13 of 15 children had IgE that reacted with a central part of the bovine alpha2 type I chain, and a 10-amino-acid stretch was the main binding site. That stretch is not in the human type I chains. 13 of 15 patients reacted. (Not applicable.) Methods, limits and fundingOutcomes: Which part of bovine collagen the allergy antibodies bind to Limitations: Laboratory test of blood from 15 children with vaccine reactions; it shows what the antibodies bind, not how often a supplement causes a reaction. Funding and conflicts: Not stated in the abstract. Read: abstract |
| Knight 2006 Hydroxyproline ingestion and urinary oxalate and glycolate excretion. Kidney Int · PMID 17021603 · DOI |
Controlled feeding study |
Healthy people on controlled oxalate diets (number not in the abstract) | Gelatin (a source of hydroxyproline) compared with whey protein Food protein 30 g gelatin or whey; also 1, 2, 5 and 10 g gelatin Single loads · vs Whey protein |
After 30 g of gelatin, urinary glycolate was 5.3 times higher and urinary oxalate 43% higher than after whey. Loads of 5 and 10 g changed plasma hydroxyproline and urine oxalate and glycolate; 1 and 2 g did not. Oxalate +43%; glycolate 5.3-fold (30 g gelatin vs whey). (Not given in the abstract.) Methods, limits and fundingOutcomes: Urinary oxalate and glycolate; plasma hydroxyproline Limitations: A short feeding study of gelatin, not of a collagen supplement and not in people with kidney stones. It shows a change in urine chemistry, not stones. Funding and conflicts: Research supported by NIH extramural funding (per the PubMed record). Read: abstract |
| Kržišnik 2024 A Comprehensive Analytical Approach for Quality Control of Collagen in Food Supplements. Mar Drugs · PMID 39452843 · DOI |
Laboratory study product test |
Collagen food supplements tested in a laboratory (number not in the abstract) | Collagen supplements (marine and land-animal origin) Finished products |
Collagen content in the supplements tested was adequate, but some labels did not match the origin found, with possible safety implications. The new method can tell marine from land-animal collagen. Not given in the abstract. (Not applicable.) Methods, limits and fundingOutcomes: Collagen content; match between label and collagen origin Limitations: Number of products and which ones did not match are not in the abstract. It does not say how common mismatches are in the market. Funding and conflicts: The authors declare no conflicts of interest. Read: abstract |
| Kumar 2015 A double-blind, placebo-controlled, randomised, clinical study on the effectiveness of collagen peptide on osteoarthritis. J Sci Food Agric · PMID 24852756 · DOI |
Randomised controlled trial |
People diagnosed with knee osteoarthritis | Collagen peptides from pork skin and from bovine bone (two groups) Oral supplement 13 weeks · vs Placebo |
Scores fell from the start in both collagen groups and stayed unchanged in the placebo group. At 13 weeks all scores were lower than placebo. All scores lower than placebo at 13 weeks (P < 0.01); numbers are not in the abstract. (Not given in the abstract.) Methods, limits and fundingOutcomes: WOMAC score, pain scale (VAS), quality of life Limitations: Group sizes are not in the abstract. The bovine bone group is not reported separately in the abstract. Funding and conflicts: Lead author works for Nitta Gelatin India Ltd, a collagen maker (industry link). Read: abstract |
| König 2018 Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study. Nutrients · PMID 29337906 · DOI |
Randomised controlled trial |
131 Postmenopausal women (average age 64) with age-related reduced bone density |
Specific collagen peptides (animal source not stated in the abstract) Oral supplement 5 g a day 12 months · vs Placebo |
Bone density T-scores rose in the collagen group and not in placebo at both sites. P1NP (bone building) rose with collagen; CTX 1 (bone breakdown) rose in the placebo group. Spine T-score +0.1 vs -0.03 (p = 0.030); femoral neck +0.09 vs -0.01 (p = 0.003). P1NP p = 0.007; CTX 1 p = 0.011. (Not given in the abstract.) Methods, limits and fundingOutcomes: Bone mineral density of the spine and femoral neck; blood bone markers P1NP and CTX 1 Limitations: 102 of 131 women finished; all were analysed. Changes were small. The abstract does not say the collagen was bovine, so it cannot be assumed. Funding and conflicts: The authors declare no conflict of interest; two authors are at or linked to the Collagen Research Institute, a collagen research company. Read: abstract |
| Lin 2023 Analgesic efficacy of collagen peptide in knee osteoarthritis: a meta-analysis of randomized controlled trials. J Orthop Surg Res · PMID 37717022 · DOI |
Systematic review meta analysis |
507 4 randomised trials in people with knee osteoarthritis |
Collagen peptides or hydrolysed collagen (source not separated) Oral supplement · vs Placebo |
Pain was lower with collagen peptide than placebo. The risk of adverse events did not differ significantly between groups. All four trials were rated high risk of bias. Pain: standardised mean difference -0.58, p = 0.004, I2 68%. Adverse events: odds ratio 1.66, p = 0.05, I2 0%. (Pain: 95% CI -0.98 to -0.18. Adverse events: 95% CI 0.99 to 2.78.) Methods, limits and fundingOutcomes: Pain; adverse events Limitations: Only four trials, all at high risk of bias; large differences between trials. The authors graded the pain result moderate and the adverse-event result very low certainty. The adverse-event interval just reaches 1, so a small rise cannot be ruled out. Funding and conflicts: The authors report no conflict of interest. Read: abstract |
| Paul 2019 Significant Amounts of Functional Collagen Peptides Can Be Incorporated in the Diet While Maintaining Indispensable Amino Acid Balance. Nutrients · PMID 31096622 · DOI |
Modelling study model |
A calculation using a Western-pattern diet | Collagen peptides (source not stated) Diet model |
Collagen lacks tryptophan, so it is rated an incomplete protein. Iterative scoring found that up to 36% of daily protein could be collagen peptides while still meeting indispensable amino acid needs. 36% of protein (model result). (Not applicable.) Methods, limits and fundingOutcomes: Maximum share of daily protein collagen peptides could replace while meeting indispensable amino acid needs Limitations: A calculation, not a trial in people. It says nothing about benefit. Funding and conflicts: Authors include a Gelita AG employee and a researcher who provides services to a supplement maker; they state no influence on the work. Read: abstract |
| Pu 2023 Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis. Nutrients · PMID 37432180 · DOI |
Systematic review meta analysis |
1721 26 randomised trials of hydrolysed collagen from several sources; skin hydration and elasticity |
Hydrolysed collagen (several sources) Oral supplement Varied; subgroups by duration · vs Placebo |
Hydrolysed collagen improved skin hydration compared with placebo. Hydration results varied by collagen source and by how long it was taken. For elasticity there was no significant difference between sources. Hydration overall effect Z = 4.49, p < 0.00001. Difference between sources for elasticity p = 0.21. (Not given in the abstract.) Methods, limits and fundingOutcomes: Skin hydration; skin elasticity Limitations: The authors found several biases in the included trials and call for larger trials. Bovine collagen is not separated out in the abstract. Funding and conflicts: No conflict of interest declared; funders had no role (per the paper). Read: abstract |
| Sami 2026 The Alpha-Gal Syndrome and Hypersensitivity to Biomaterials: Understanding Xenoimmunity. Cardiol Rev · PMID 41703677 · DOI |
Narrative review review |
Review of reactions to animal-derived medical materials | Not a supplement study |
People with alpha-gal syndrome face risk from porcine heparin, gelatin-based hemostatic agents and bioprosthetic heart valves, with reactions from delayed hives to immediate anaphylaxis. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Risks for people with alpha-gal syndrome Limitations: About medical products, not supplements. Funding and conflicts: The authors declare no conflict of interest. Read: abstract |
| Singh 2023 Regulation of Collagen I and Collagen III in Tissue Injury and Regeneration. Cardiol Cardiovasc Med · PMID 36776717 · DOI |
Narrative review review |
Review of collagen I and III biology | Not a supplement study |
Collagen I is a stiff fibre that gives tensile strength; collagen III forms an elastic network. They are the two main structural collagens in many tissues, including skin, blood vessels and bone. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Roles of collagen I and III Limitations: About body collagen, not about eating it; it does not show that eating type I or III collagen raises them in the body. Funding and conflicts: The authors declare no conflict of interest. Read: abstract |
| Sun 2025 Efficacy of collagen peptide supplementation on bone and muscle health: a meta-analysis. Front Nutr · PMID 41049371 · DOI |
Systematic review meta analysis |
Randomised trials of collagen peptides alone or with calcium and vitamin D (number of trials not in the abstract) | Collagen peptides (source not separated) Oral supplement · vs Placebo or control |
Collagen peptides raised bone density at the femoral neck and spine, but results differed a lot between trials. Bone turnover markers and muscle performance also improved. Pairing with vitamin D and calcium showed small added gains. Bone turnover markers SMD 0.40 to 0.58; muscle performance SMD 0.60; with vitamin D and calcium SMD 0.40 to 0.56; bone density heterogeneity I2 = 80.1%. (Muscle performance 95% CI 0.05 to 1.15.) Methods, limits and fundingOutcomes: Bone mineral density, bone turnover markers, fracture risk, muscle performance Limitations: Very uneven bone density results (I2 80.1%). Number of trials and their quality are not in the abstract; the authors' wording ('adjunct therapy for osteoporosis') goes further than the numbers. Funding and conflicts: The authors report no commercial or financial relationships. Read: abstract |
| Virgilio 2024 Absorption of bioactive peptides following collagen hydrolysate intake: a randomized, double-blind crossover study in healthy individuals. Front Nutr · PMID 39149544 · DOI |
Randomised controlled trial |
Healthy volunteers (number not in the abstract) | Skin- and hide-derived collagen hydrolysates from fish, pig and cattle, two bovine molecular weights (2,000 and 5,000 Da) Oral single serving Single dose · vs Crossover between products |
All hydrolysates gave comparable blood levels of free hydroxyproline, and total hydroxyproline was higher than free, showing hydroxyproline-containing small peptides were taken up. Source and molecular weight did not matter for this. Qualitative; numbers are not in the abstract. (Not given in the abstract.) Methods, limits and fundingOutcomes: Blood levels of free and peptide-bound hydroxyproline and collagen peptides Limitations: Single dose in healthy people; it measures absorption, not any health benefit. The authors say larger studies are needed. Funding and conflicts: Several authors are employees of Rousselot BV, a collagen maker; others work at testing companies. Read: abstract |
| Wilson 2024 Tick bites, IgE to galactose-alpha-1,3-galactose and urticarial or anaphylactic reactions to mammalian meat: The alpha-gal syndrome. Allergy · PMID 38193233 · DOI |
Narrative review review |
Review of alpha-gal syndrome, a tick-linked allergy to mammal meat | Not a supplement study |
Alpha-gal syndrome can involve reactions to organ meats, dairy, gelatin and other products, including medicines, made from non-primate mammals. Reactions are often delayed 2 to 6 hours after eating mammal meat. Not applicable. (Not applicable.) Methods, limits and fundingOutcomes: Which products can trigger alpha-gal reactions Limitations: A review; it names gelatin but does not test collagen supplements. Funding and conflicts: Some authors hold patents or receive assay support or grants related to alpha-gal testing (per the paper's statement). Read: abstract |
| Zdzieblik 2015 Collagen peptide supplementation in combination with resistance training improves body composition and increases muscle strength in elderly sarcopenic men: a randomised controlled trial. Br J Nutr · PMID 26353786 · DOI |
Randomised controlled trial |
53 Men about 72 years old with sarcopenia (age-related muscle loss) who finished the trial |
Collagen peptides (animal source not stated in the abstract) Oral supplement 15 g a day 12 weeks of supervised resistance training · vs Silica placebo |
Everyone improved with training. The collagen group improved more in fat-free mass, leg strength and fat loss than the placebo group. Fat-free mass +4.2 vs +2.9 kg; leg strength +16.5 vs +7.3 Nm; fat mass -5.4 vs -3.5 kg (each P < 0.05). (Not given in the abstract.) Methods, limits and fundingOutcomes: Fat-free mass, fat mass, leg strength, balance control Limitations: Small trial in older men only; effects need the training programme. An erratum was later published for this paper (its content was not read). The abstract does not say the collagen was bovine. Funding and conflicts: Not stated in the abstract; two authors are at the Collagen Research Institute. Read: abstract |
| de Miranda 2021 Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol · PMID 33742704 · DOI |
Systematic review meta analysis |
1125 19 randomised, double-blind trials; adults aged 20 to 70 (95% women) |
Hydrolysed collagen (several sources) Oral supplement The authors conclude 90 days of use was effective · vs Placebo |
Pooled results favoured hydrolysed collagen over placebo for skin hydration, elasticity and wrinkles. Direction only; numbers are not in the abstract. (Not given in the abstract.) Methods, limits and fundingOutcomes: Wrinkles, hydration, elasticity, firmness Limitations: Almost all participants were women. Bovine collagen is not separated out in the abstract. Funding and conflicts: Not stated in the abstract. Read: abstract |
| s-cdc-alpha-gal CDC: About alpha-gal syndrome (page blocked, not read) · Source |
Reference database n/a |
Methods, limits and fundingRead: not-read |
What we do not know yet
- No randomised trial of bovine collagen alone on skin was found.
- Independent (not maker-run) trials of bovine collagen peptides were not found.
- No study tested whether 'types I and III' or 'grass-fed' changes results, purity or safety.
- No safety data in pregnancy, breastfeeding or children were read.
- No survey of contaminants in bovine collagen products was found.
- No collagen amounts per portion of beef or bone broth were found.
How new research is added
New studies are found by a saved PubMed search and placed in a review queue before the page changes.
Lab markers
What changed in blood or saliva tests during trials. A changed number is not the same as feeling or being healthier, and we give no "normal ranges".
Other 5
Skin hydration
Higher with collagen in most pooled analyses in trials
How much water the outer layer of the skin holds, measured with a skin meter.
Low certaintyResults and what it means
Why it was measured
The most common measure in collagen skin trials.
Statistical vs. clinical meaning
Small instrument readings; not shown to change how skin looks or feels day to day.
Safety implication
Allergy to beef or gelatin is the main safety concern.
Skin elasticity
Higher with collagen in most trials in trials
How well the skin springs back after being pulled gently, measured with a suction device.
Low certaintyResults and what it means
Why it was measured
Loss of elasticity is a sign of skin ageing.
Statistical vs. clinical meaning
Instrument readings; most trials were high risk of bias.
Safety implication
Same as above.
Knee pain score
Lower with collagen peptides in the trials read in trials
A pain rating (for example a visual scale or the WOMAC index) filled in by people with knee osteoarthritis.
Low certaintyResults and what it means
Why it was measured
Pain is the main complaint in knee osteoarthritis.
Statistical vs. clinical meaning
Self-reported pain can be affected by expectation; trials were high risk of bias and some were by makers.
Safety implication
Side-effect rates were not clearly different from placebo.
| Study | Result | People | Product |
|---|---|---|---|
| 11 | Pain lower than placebo (standardised mean difference -0.58, 95% CI -0.98 to -0.18, I2 68%) | 4 trials, 507 people | Collagen peptides or hydrolysed collagen |
| 9 | WOMAC and pain scale scores lower than placebo at 13 weeks (P < 0.01); numbers not in the abstract | Adults with knee osteoarthritis | Peptides from pork skin and from bovine bone |
Bone mineral density
Slightly higher with collagen peptides in the trials read in trials
A scan measure of how dense bone is at the spine and hip.
Low certaintyResults and what it means
Why it was measured
Lower density is linked to fracture risk.
Statistical vs. clinical meaning
Small changes on a scan; fewer fractures were not shown.
Safety implication
None reported in the abstracts.
| Study | Result | People | Product |
|---|---|---|---|
| 10 | Spine T-score +0.1 vs -0.03 (p = 0.030); femoral neck +0.09 vs -0.01 (p = 0.003) | 131 postmenopausal women, 12 months | Specific collagen peptides, source not stated |
| 16 | Higher spine and femoral neck density, very uneven (I2 = 80.1%) | Randomised trials (number not stated) | Collagen peptides |
Fat-free mass
Higher with collagen peptides plus training in trials
Body weight that is not fat (muscle, bone, organs, water), measured by a body scan.
Low certaintyResults and what it means
Why it was measured
A guide to muscle gain in strength-training trials.
Statistical vs. clinical meaning
Seen in one small trial only.
Safety implication
None reported.
| Study | Result | People | Product |
|---|---|---|---|
| 19 | +4.2 kg vs +2.9 kg with placebo (P < 0.05) | 53 older men with sarcopenia, 12 weeks | Collagen peptides plus resistance training |
Safety
What studies and official sources say about side effects, medicines and who should check first. Each point shows what kind of evidence it comes from.
Main points to know 4
- Beef, gelatin and alpha-gal allergy come first. Gelatin is mostly denatured type I collagen, and the type I collagen of cattle is a known allergen. In a laboratory study, 13 of 15 children who had reacted to vaccines containing bovine gelatin had IgE to the central part of the bovine alpha2 type I chain. A patient had anaphylaxis after jelly candy with bovine gelatin and hair gel, and two young patients had life-threatening anaphylaxis to a bovine gelatin surgical product, with IgE to bovine collagen. Alpha-gal syndrome, a tick-linked allergy to mammal meat, can involve gelatin and products from non-primate mammals; reactions are often delayed 2 to 6 hours. If you have a beef allergy, gelatin allergy or alpha-gal syndrome, ask an allergist before any cow-derived collagen. Case reports, laboratory studies and review 6 5 2 18 14
- Label origin may not match what is in the product. A 2024 laboratory study of collagen food supplements found collagen content was adequate, but some labels did not match the origin of the collagen found, with possible safety implications. The abstract does not say how many products or which ones. This matters most for people avoiding beef, pork or fish for allergy or other reasons. Laboratory study 8
- Mad cow disease (BSE): what the European regulator concluded. In 2024 the European Food Safety Authority assessed gelatine and collagen made from cattle, sheep and goat bones under EU rules. It judged it almost certain (99 to 100 percent) that eating them would not create a new BSE case in cattle or small ruminants. It said human disease risk cannot be read directly from exposure because the human transmission barrier is not quantified, though it is considered substantial. This is a regulator's model for EU production, not a guarantee for every product. Regulator risk assessment 4
- Collagen, hydroxyproline and kidney stones. Collagen is rich in hydroxyproline, an amino acid the body can turn into oxalate, a building block of the most common kidney stones. In a controlled diet study, 30 g of gelatin raised urine oxalate 43% above whey protein, and 5 and 10 g changed urine and blood markers while 1 and 2 g did not. This was gelatin in healthy people, not a supplement study and not stones. Controlled feeding study 7
Side effects 2
| Effect | How often | Severity and recovery | Evidence |
|---|---|---|---|
| Allergic reactions in people allergic to beef, cow gelatin or bovine collagen (including anaphylaxis) The cases involve gelatin in food and a surgical product, not a collagen supplement. | Not known. 13 of 15 children with vaccine reactions to bovine gelatin had IgE to bovine collagen in one laboratory study. | Can be life-threatening Not described in the abstracts read. | Case reports and laboratory studies 6 5 2 |
| Mild side effects (not specified) The reviews did not separate bovine from other collagen. | Described as low incidence in a 2026 review; the 2023 knee pooled analysis found no clear difference from placebo (odds ratio 1.66, 95% CI 0.99 to 2.78, very low certainty). | Usually mild Not described. | Systematic review 1 11 |
Liver
No liver or kidney injury from bovine collagen was found in the sources read. A liver-safety reference (LiverTox) was not opened. The urine oxalate finding above is the only kidney-related signal found. 7
How often. No frequency was found.
Monitoring. No agency monitoring advice was found.
This is a safety connection. It is not evidence that Bovine Collagen (Types I and III) supports liver health.
Medicines and supplements 3
| With | Why it matters | Importance | Evidence | What to do |
|---|---|---|---|---|
| Prescription and over-the-counter medicines prescription | Not described in the sources read. | No drug interaction was found in the abstracts read; none was checked against a drug-interaction reference. | None found Not enough evidence 1 | Ask a pharmacist, especially if you take several medicines. |
| Other ingredients in combination products (vitamins, minerals, plant extracts) supplement | Many collagen products mix several ingredients. | Effects and side effects of a mixed product cannot be tied to collagen alone. | No study read Not enough evidence | Check the full ingredient list. |
| Other gelatin or beef-derived products and medicines food | Alpha-gal syndrome is an allergy to a sugar found in non-primate mammals; reviews list gelatin and medicines from such animals as possible triggers. | People with alpha-gal syndrome may react to cow-derived gelatin and related products; reactions are often delayed 2 to 6 hours. | Narrative review Low certainty 18 14 | If you have alpha-gal syndrome or a beef allergy, ask an allergist before any cow-derived collagen or gelatin. |
Who should check first 5
| Situation | Advice | Evidence |
|---|---|---|
| Beef allergy, gelatin allergy or alpha-gal syndrome | Ask an allergist before using. Bovine gelatin and collagen have caused anaphylaxis in case reports, and alpha-gal syndrome can involve gelatin. | Case reports, laboratory studies and review 6 5 2 18 |
| Kidney stones or high urine oxalate | Collagen is rich in hydroxyproline, which the body can turn into oxalate. A feeding study found higher urine oxalate after 30 g of gelatin. No study of collagen supplements in people with stones was read. Ask a doctor. | Controlled feeding study 7 |
| Pregnancy and breastfeeding | No safety study in pregnancy or breastfeeding was read. Ask a doctor or pharmacist. | No data found |
| Children | No trial of collagen supplements in children was read. Gelatin reactions in children are described after vaccines. Ask a paediatrician. | Laboratory study 6 |
| Kidney or liver disease | No source read gave advice for these conditions. Ask a doctor. | No data found |
Overdose, product quality and regulators
Summary. No harmful-amount or poisoning data for bovine collagen were found. The known danger is allergy, not toxicity from amount.
Animal. Not reviewed.
Overdose response. Not described in the sources read. For a severe allergic reaction call emergency services.
Genotoxicity. Not researched.
No survey of heavy metals or other contaminants in bovine collagen products was found, so none is claimed. The one product-testing paper read looked at label origin and collagen content.
Label origin. A 2024 laboratory study found some collagen supplements had labels that did not match the collagen origin found. 8
BSE. EFSA's 2024 assessment is summarised above. It concerns EU production rules for bone-derived gelatine and collagen. 4
Sourcing words (grass-fed, pasture-raised). No source read tested whether these words change purity or safety.
| Body | Action | Date |
|---|---|---|
| EFSA (European Food Safety Authority) BIOHAZ Panel (European Union) | Concluded it is almost certain (99 to 100 percent) that gelatine or collagen from ruminant bones made under EU rules would not create a new BSE case in cattle or small ruminants; human risk cannot be read directly from exposure. source | 2024-07-16 |
When to get medical help
- After any product made from cow, gelatin or collagen: trouble breathing, swelling of the lips, face or throat, widespread hives, repeated vomiting, dizziness or fainting. These can be signs of anaphylaxis: call emergency services at once.
- Delayed reactions 2 to 6 hours after eating, in someone with alpha-gal syndrome, can still be serious: get medical help for hives with vomiting, breathing trouble or faintness.
Stop using the product and contact a clinician or emergency service. In the US, Poison Control is 1-800-222-1222.
General information only, not medical advice. Ask a clinician or pharmacist before use, especially with medicines, in pregnancy or with a health condition. See the Natural Remedy Safety guide.
Frequently asked questions
What is bovine collagen?
Does bovine collagen make skin look younger?
Does it help knee joint pain?
Does it strengthen bones?
Does it build muscle?
One small trial in older men found more muscle and strength gain when collagen was combined with strength training. It was not tested without training or for bovine collagen specifically.
What do 'types I and III' on the label mean?
They name the two main structural collagens in the body. No source read shows a product with those words works better or is safer than one without them.
Does 'grass-fed' make bovine collagen better?
No source read tested this. It describes how the cattle were raised, not purity or results. Ask the maker for test results if it matters to you.
Is bovine collagen safe with respect to mad cow disease?
In 2024 EFSA judged it almost certain (99 to 100 percent) that gelatine or collagen from ruminant bones made under EU rules would not create a new BSE case in cattle or small ruminants. Human risk cannot be read directly from exposure.
Who should avoid bovine collagen?
Can collagen supplements raise kidney stone risk?
Collagen is rich in hydroxyproline, which the body can turn into oxalate. A feeding study found higher urine oxalate after 30 g of gelatin. No study of collagen supplements in people with stones was read. Ask a doctor if you have stones.
Can the label be wrong about the source?
A 2024 laboratory study found some collagen supplements had labels that did not match the origin of the collagen found. The abstract does not say how many.
Is bovine collagen the same as marine collagen or gelatin?
No. Marine collagen comes from fish and carries fish-allergy risks. Gelatin is partly broken-down collagen. Each has its own page.
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Editorial transparency
- Written by
- AlternativeMed editorial team. Research compiled with AI assistance, then checked against the sources listed.
- Medical review
- None. This page has not been reviewed by a physician or pharmacist.
- First published
- 2026-10-26
- Last substantive update
- 2026-10-26
- How we research
- We searched PubMed for trials, reviews, allergy studies and regulator opinions on bovine collagen, checked each title with PubMed's summary record and read each abstract. Only abstracts were read. The CDC alpha-gal page returned an access-denied error and is marked unread.
- How we rate evidence
- See "How we rate evidence" in the Evidence tab.
- Independence
- No product is promoted on this page. No affiliate links are shown. Several bovine-collagen trials were run or paid for by makers; this is stated on each study.
Sources 21
Each source was opened and checked. Where we read only the abstract, it says so. The small numbers in the text point here.
- Bassila C, Bassila JC, Slim M. Efficacy and safety of hydrolyzed collagen supplementation on skin health outcomes: a systematic literature review of randomized controlled trials.. Eur J Clin Nutr. 2026. PMID 42342959. DOI 10.1038/s41430-026-01778-3. (abstract)
- Coury JR, Skaggs KF, Marciano GF, Pinyavat T, Naseef M et al.. Intraoperative Anaphylaxis to the Bovine Flowable Gelatin Matrix: A Report of 2 Cases.. JBJS Case Connect. 2022. PMID 35239550. DOI 10.2106/JBJS.CC.21.00753. (abstract)
- Devasia S, Joseph JT, P S S, Koizumi S, Clarke L et al.. Management and Amelioration of Knee Joint Osteoarthritis in Adults Using a Novel High-Functional Bovine Collagen Peptide as a Nutritional Therapy: A Double-Blind, Prospective, Multicentric, Randomized, Active and Placebo Controlled, Five-Arm, Clinical Study to Evaluate the Efficacy, Safety, and Tolerability.. Cartilage. 2024. PMID 38235711. DOI 10.1177/19476035231221211. (abstract)
- EFSA Panel on Biological Hazards (Koutsoumanis K, Allende A, Bolton D et al.). BSE risk posed by ruminant collagen and gelatine derived from bones.. EFSA J. 2024. PMID 39015303. DOI 10.2903/j.efsa.2024.8883. (abstract)
- Gungor HE, Tahan F. Anaphylaxis Provoked by Bovine Gelatin Caused by Ingestion of Jelly Candy and Using Hair Gel.. Pediatr Allergy Immunol Pulmonol. 2013. PMID 35927840. DOI 10.1089/ped.2012.0171. (abstract)
- Hori H, Hattori S, Inouye S, Kimura A, Irie S et al.. Analysis of the major epitope of the alpha2 chain of bovine type I collagen in children with bovine gelatin allergy.. J Allergy Clin Immunol. 2002. PMID 12373276. DOI 10.1067/mai.2002.127862. (abstract)
- Knight J, Jiang J, Assimos DG, Holmes RP. Hydroxyproline ingestion and urinary oxalate and glycolate excretion.. Kidney Int. 2006. PMID 17021603. DOI 10.1038/sj.ki.5001906. (abstract)
- Kržišnik N, Kurent E, Roškar R. A Comprehensive Analytical Approach for Quality Control of Collagen in Food Supplements.. Mar Drugs. 2024. PMID 39452843. DOI 10.3390/md22100435. (abstract)
- Kumar S, Sugihara F, Suzuki K, Inoue N, Venkateswarathirukumara S. A double-blind, placebo-controlled, randomised, clinical study on the effectiveness of collagen peptide on osteoarthritis.. J Sci Food Agric. 2015. PMID 24852756. DOI 10.1002/jsfa.6752. (abstract)
- König D, Oesser S, Scharla S, Zdzieblik D, Gollhofer A. Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study.. Nutrients. 2018. PMID 29337906. DOI 10.3390/nu10010097. (abstract)
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- . CDC: About alpha-gal syndrome (page blocked, not read). . . (not-read)
Where to buy
Check the label first. Whatever you buy, look for these:
- The amount of the active ingredient per serving, not just the front-label claim
- A third-party testing mark (USP, NSF or ConsumerLab)
- Other ingredients and allergens
- Ask a pharmacist about interactions with your medicines
Talk to a pharmacist or doctor before you start any supplement, especially if you take medicines. See the Safety tab for interactions.
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