Fulvic Acid and Humic Acid: What They Are and What Is Known
What fulvic and humic acids are, where products come from, what lab, animal and human studies show, and why composition and metal content differ between products.
Content last updated . This page has not been medically reviewed.
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What is Fulvic and Humic Acid good for?
What the body uses it for, and how strong the evidence is. A normal job in the body is not proof that extra supplements add benefit; each card says which.
Fulvic or humic acid taken for any condition in people
Not enough evidenceThe sources we read include no randomized trial of fulvic or humic acid taken alone by people. Claims that they cleanse, detox or heal are seller claims here.
Supplements: Proper evidence not found in the sources we read.
Binding metals: 'removes heavy metals' claim check
Lab or animal research onlyReviews say fulvic acid can bind metals such as lead in soil and water chemistry. In mice, humic substances did not change cadmium uptake from the gut, though kidney cadmium was lower. A shilajit review says metal detoxification evidence needs clarifying.
Supplements: Lab and animal findings only; no human detox benefit shown.
Combination supplement in a nursing-home COVID-19 chart review
Not enough evidenceIn a retrospective review of 60 records, residents given a combination of EGCG, humic/fulvic acid and vitamin C had no deaths, versus 21 deaths among 38 others. It was not randomized and the combination makes it impossible to credit fulvic or humic acid.
Supplements: Cannot show that fulvic or humic acid works.
Gut and cell findings (mice and cell cultures)
Lab or animal research onlyIn mice, fulvic acid reduced chemically induced small-intestine injury. Two fulvic acid formulations were well tolerated by cells and shifted gut microbes in lab and animal tests.
Supplements: Lab or animal only.
Immune, antioxidant and other 'pharmacological' claims
Lab or animal research onlyA 2025 review lists many effects of humic substances. Its abstract does not separate human from laboratory findings, so we do not rely on it for human benefit.
Supplements: Mostly lab-level claims.
Animal safety studies
Lab or animal research onlyIn a 60-day rat study, up to 5,000 mg/kg a day caused no significant changes, the highest amount tested. A sucrose-made fulvic acid was not genotoxic in most tests, with a weak effect in human lymphocytes that authors linked to pH.
Supplements: Animal and lab safety data only; no human safety data were found.
Soil and plant (agriculture) use
Not enough evidenceMuch recent research on humic substances is about soil and plants, where reviewers say effects vary with source and chemistry.
Supplements: Not a health claim.
Connected topics
Open a group to see how each topic connects and how strong the evidence is.
Functional actions (1)
- Gut RepairLab or animal research only
Reduced intestinal injury in mice and shifted gut microbes in lab tests; no human data read.
Root causes (1)
- Heavy Metal ExposureDocumented risk
Environmental and mined fulvic products can contain lead, cadmium, arsenic and mercury; content varies by batch.
Documented risks and interactions (1)
- Metals and variable makeup of products. Fulvic acids from the environment vary a lot and may contain heavy metals. Five batches of one traditional mineral medicine containing humic and fulvic acid each held measurable lead, cadmium, arsenic, mercury and copper. A shilajit review warns that using it without knowing metal levels is not safe.
Fulvic and humic acids are not one standard ingredient. A review of the field says their quality varies with raw materials and extraction methods. [1] The sources we read include no randomized trial of fulvic or humic acid taken alone by people, so claims that they "cleanse", "detox" or "heal" are marketing claims here, not established findings. If you have symptoms, see a clinician; for a suspected poisoning call Poison Help at 1-800-222-1222 (US).
What they are
Humic substances form when plant and animal matter breaks down, and they consist mainly of humin, humic acid and fulvic acid. [2] Fulvic acid is described as the main active part of humic substances; it can come from low-rank coal (lignite), peat and soil. [1] Shilajit, a different material discussed on shilajit: evidence, contamination and safety, is reported to be more than 80% humic substances. [3]Different products share a name. One developed "carbohydrate-derived" fulvic acid is made by oxidizing sugar (sucrose) rather than mined; the developers did so partly to avoid the variable composition and metal impurities that they say environmental fulvic acids can have. [4] Results for one material do not apply to another.
Much of the recent research on these substances concerns soil and plants, where review authors say effects vary a great deal with source, chemistry and dose. [5][6]
Traditional use
Wujin, a mineral-derived Chinese medicine containing humic and fulvic acids, was first recorded in the Compendium of Materia Medica (Bencao Gangmu) and has been used for inflammatory conditions, according to a 2026 paper, which also notes that its safety had not been systematically evaluated. [7] A mouse study describes a fulvic acid product as a mineral-based Chinese medicine commonly used for gastrointestinal diseases. [8] That is tradition and product description, not proof. See animal and mineral ingredients in Chinese medicine.What research shows
| Question | What the source found | Strength of evidence | What was studied |
|---|---|---|---|
| Does taking fulvic or humic acid help any condition in people? | Proper evidence not found in the sources we read. We searched PubMed for fulvic or humic acid with randomized and clinical trial limits in humans. | Insufficient evidence | None |
| Nursing-home COVID-19 chart review | Among 60 records, none of 22 patients given a combination of a compound called EGCG, humic/fulvic acid and vitamin C died, versus 21 of 38 others. [9] It was retrospective, not randomized, and the combination makes it impossible to credit fulvic or humic acid. | Insufficient evidence | Nursing-home residents in one facility; combination |
| Animal safety | In a 60-day animal study, amounts up to 5,000 mg/kg body weight a day caused no significant changes; that was the highest amount tested. [10] | Preclinical (animals) | A fulvic acid product; animal doses do not tell us a human amount |
| Cells, microbes and genotoxicity | Two mined fulvic acid formulations were well tolerated by cells and changed gut microbes in lab and animal tests. [11] The sucrose-derived product showed no genotoxicity in the tests, apart from a weak effect in human lymphocytes that the authors thought may be due to pH. [4] | Preclinical (cells and animals) | Specific formulations |
| Stomach and gut injury | Fulvic acid reduced chemically induced intestinal injury in mice. [8] | Preclinical (animals) | Mice |
| Binding metals | In mice, humic substances did not change intestinal uptake of cadmium at six hours, though kidney cadmium retention was lower. [12] A review of shilajit says the evidence on metal detoxification needs to be clarified. [13] | Preclinical; marketing claim | Mice; review |
| Broad "pharmacological" claims | A 2025 review lists many effects and states they lack toxic and allergenic properties. [14] Its abstract does not separate human from laboratory findings, so we do not rely on it for human benefit. | Insufficient evidence | Mixed |
Frequently asked questions
What is the difference between fulvic acid and humic acid?
Both are parts of humic substances, which form as organic matter breaks down. [2] Fulvic acid is described as the main active component. [1]
Is fulvic acid proven to help people?
Proper evidence not found in the sources we read for randomized trials of fulvic acid alone. A nursing-home chart review used a combination and cannot show a benefit. [9]
Is fulvic acid safe?
A 60-day animal study found no significant changes up to the highest dose tested, but that is animal evidence. [10] Product composition and metal content vary. [4]
Is shilajit the same as fulvic acid?
No. Shilajit is a material whose major component is humic substances, which include fulvic acid. [3]
Does fulvic acid remove heavy metals from the body?
Not shown. It binds metals in laboratory and environmental settings, but human detox claims have not been established in the sources we read. [1][13]
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.
Safety and quality
- Composition and metals. Environmental fulvic acids vary and may contain heavy metals. [4] Five batches of Wujin each contained measurable lead, cadmium, arsenic, mercury and copper. [7] A genotoxicity test of that product was negative. [7] See heavy metals in natural ingredients.
- Human safety. No human safety data on fulvic or humic acid supplements were found in the sources we read. Animal findings are not proof of safety in people.
- Medicines, pregnancy, breastfeeding, children, liver and kidney disease, surgery. Not described in the sources we read. Lack of evidence is not proof of safety. See how interactions work and ask a pharmacist.
- Labels. Names such as "fulvic complex" or "mineral" do not tell you the source or the metals. See quality testing and certifications.
References
- Advances in fulvic acid extraction from lignite: techniques, challenges, and applications. Environ Monit Assess. 2026. PubMed 41860641. Review. Read 2026-10-23.
- Isolation, characterization, and antifungal behavior of humic acid and fulvic acid fractions from biowaste-derived vermiproducts. J Environ Sci Health B. 2025. PubMed 41376176. Laboratory study. Read 2026-10-23.
- A comprehensive review on shilajit: what we know about its chemical composition. Crit Rev Anal Chem. 2025. PubMed 38133965. Narrative review. Read 2026-10-23.
- Genotoxicity of carbohydrate derived fulvic acid. Toxicol Rep. 2026. PubMed 42383226. Laboratory and mouse study. Read 2026-10-23.
- Natural biostimulants for sustainable agriculture: the mechanisms and functions of humic substances for plant growth advancement. ACS Omega. 2026. PubMed 42326667. Review. Read 2026-10-23.
- Humic substances for abiotic stress resilience: current knowledge and perspectives. Plant Physiol Biochem. 2026. PubMed 42302557. Review of plant studies. Read 2026-10-23.
- Evaluation of the mutagenic and genotoxic potential of Wujin: a traditional mineral medicine. J Ethnopharmacol. 2026. PubMed 41985640. Laboratory and mouse study. Read 2026-10-23.
- Protection of fulvic acid against 5-fluorouracil-induced intestinal injury in mice. Curr Pharm Biotechnol. 2026. PubMed 42565411. Mouse study. Read 2026-10-23.
- COVID-19 humic/fulvic acid plus epigallocatechin gallate treatment: a retrospective chart review. Cureus. 2025. PubMed 39925527. Retrospective chart review. Read 2026-10-23.
- A comprehensive toxicological assessment of fulvic acid. Evid Based Complement Alternat Med. 2020. PubMed 33381216. Rat and mouse study. Read 2026-10-23.
- Integrated safety and microbiota profiling of fulvic acid formulations across in vitro and in vivo models. Sci Rep. 2026. PubMed 41580488. Cell and animal study. Read 2026-10-23.
- The influence of humic substances on the absorption and distribution of cadmium in mice. Pharmacol Toxicol. 1999. PubMed 10401728. Mouse study. Read 2026-10-23.
- Hazardous or advantageous: uncovering the roles of heavy metals and humic substances in shilajit (phyto-mineral). Biol Trace Elem Res. 2024. PubMed 38393486. Literature review. Read 2026-10-23.
- Pharmacological effects of humic substances and their signaling mechanisms. Molecules. 2025. PubMed 41515410. Narrative review (abstract read). Read 2026-10-23.