VITAMINS & SUPPLEMENTS · GUIDE
Collagen for Muscle Mass, Strength and Sarcopenia: Trial Results
What randomized trials of collagen peptides with resistance training found for muscle mass, strength and age-related muscle loss, and how collagen compared with whey protein.
Content last updated . This page has not been medically reviewed.
Back to Collagen Supplements: What They Are, Types, Sources and EvidenceTrials against whey protein
- Older women, 6 days. 22 women (average age 69) took 30 g of whey or collagen protein twice daily with exercise. Whey raised muscle protein synthesis more; collagen did not raise longer-term synthesis significantly above baseline. [6]
- Young adults, 10 weeks. Whey (35 g) gave a greater rise in muscle thickness than leucine-matched collagen peptides, with similar gains in strength and power. [7]
- Older men, 8 days. Extra whey or pea protein raised muscle protein synthesis above the recommended intake; collagen did not. [5]
- Middle-aged men, 12 weeks. In an exploratory comparison, whey and collagen did not differ significantly. [4]
Muscle protein synthesis is a short-term laboratory measure, not proof of lasting muscle gain.
What reviews say
A 2021 systematic review of 15 randomized trials reported certain improvements in body composition and strength, and no significant effect on muscle protein synthesis versus higher-quality protein. [8] It also asked for larger samples, female participants and better outcome measures. [8]Frequently asked questions
Does collagen build muscle?
In some small trials with resistance training, collagen groups gained more fat-free mass than placebo, but training did most of the work. [1][3]
Is collagen as good as whey for muscle?
Not in the direct comparisons that measured muscle protein synthesis or muscle thickness. [6][7]
Is collagen a complete protein?
Not by the standard protein-quality score: it lacks tryptophan. [2]
Can collagen treat sarcopenia?
Proper evidence not found. One trial in men with sarcopenia measured body composition and strength alongside supervised training, not clinical outcomes. [1]
Who should check with a clinician first?
Anyone on medicines, with kidney or liver conditions, pregnant, breastfeeding, or having surgery. [9]
More details: evidence, limits and cautions
The details behind this page: cautions, limits of the evidence and where sources disagree. Open any note to read it.
How to read the evidence labels
Labels used on this page: promising but limited, mixed, insufficient evidence. Collagen peptides given alongside supervised resistance training were linked to larger gains in fat-free mass than placebo in several small trials, and some of those trials had authors affiliated with a collagen research company. [1] When collagen was compared directly with whey protein for muscle protein synthesis or muscle thickness, collagen did worse in three trials. Overall label: mixed. Training is the main driver in every trial: all groups, including placebo, improved.
Why collagen is treated differently from other proteins
One paper, written partly by collagen industry authors, notes that by a standard protein-quality score collagen "lacks one indispensable amino acid (tryptophan) and is therefore categorized as an incomplete protein source." [2] For the wider protein picture see protein for muscle, training and recovery and collagen vs protein powder.Trials against placebo, combined with resistance training
All amounts below are study amounts, not advice. The comparator was placebo unless stated.| Study | Who | Collagen peptides and length | What was measured | What the authors reported |
|---|---|---|---|---|
| 2015 randomized trial | 53 men, average age 72, with sarcopenia | 15 g a day, 12 weeks, after guided training | Scan-measured body composition, leg strength | Fat-free mass +4.2 kg vs +2.9 kg with placebo; leg strength gain larger [1] |
| 2019 randomized trial | 77 premenopausal women | 15 g a day, 12 weeks | Bioimpedance body composition, grip and leg strength | Larger rise in fat-free mass and grip strength than placebo [3] |
| 2021 randomized trial | 97 middle-aged untrained men | 15 g a day, 12 weeks (also a whey group) | Scan-measured body composition, leg strength | More fat-free mass than placebo; no statistically significant difference between whey and collagen [4] |
Points to keep in mind: sarcopenia means age-related muscle loss [5]; the trials are small; body composition and strength tests are the outcomes, not falls, independence or hospital stays; and a conflict-of-interest statement on the 2021 trial records lectures supported by a collagen manufacturer and patents on collagen peptides [4]. Fat-free mass is not the same as muscle mass, because it includes water, bone and organs.
Limits and what we did not find
- Proper evidence not found for effects on falls, fractures, walking ability or independence in people with sarcopenia. We searched PubMed for collagen supplementation with sarcopenia, older adults and strength.
- Results for hydrolyzed peptides do not transfer to gelatin, undenatured type II collagen or whole-food sources; see collagen peptides vs gelatin.
- Creatine has its own muscle research: creatine.
Safety and who should ask first
References
- Zdzieblik D et al. Collagen peptide supplementation with resistance training in elderly sarcopenic men: randomised controlled trial. Br J Nutr 2015. PubMed abstract. Read 2026-10-22.
- Paul C, Leser S, Oesser S. Significant amounts of functional collagen peptides can be incorporated in the diet while maintaining indispensable amino acid balance. Nutrients 2019. PubMed abstract. Read 2026-10-22.
- Jendricke P et al. Specific collagen peptides with resistance training in premenopausal women: randomized controlled trial. Nutrients 2019. PubMed abstract. Read 2026-10-22.
- Zdzieblik D et al. Specific bioactive collagen peptides, body composition and muscle strength in middle-aged untrained men: randomized controlled trial. Int J Environ Res Public Health 2021. PubMed abstract. Read 2026-10-22.
- McKendry J et al. Whey, pea, and collagen protein supplementation beyond the RDA and myofibrillar protein synthesis in older males: randomized controlled trial. Am J Clin Nutr 2024. PubMed abstract. Read 2026-10-22.
- Oikawa SY et al. Whey protein but not collagen peptides stimulate muscle protein synthesis in healthy older women: randomized controlled trial. Am J Clin Nutr 2020. PubMed abstract. Read 2026-10-22.
- Jacinto JL et al. Whey protein supplementation is superior to leucine-matched collagen peptides to increase muscle thickness during resistance training in untrained young adults. Int J Sport Nutr Exerc Metab 2022. PubMed abstract. Read 2026-10-22.
- Khatri M et al. Collagen peptide supplementation: body composition, collagen synthesis, and recovery from joint injury and exercise, a systematic review. Amino Acids 2021. PubMed abstract. Read 2026-10-22.
- Using Dietary Supplements Wisely, National Center for Complementary and Integrative Health (US). Read 2026-10-22.
- Information for Consumers on Using Dietary Supplements, US Food and Drug Administration. Read 2026-10-22.