Collagen supplements increase hair growth in adults.

the verdict

CONTESTED PARTIAL

Recorded sources

5 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that collagen supplements increase hair growth in adults?

Partly. Evidence is mixed and only partial: a Cleveland Clinic dermatologist-sourced article says collagen supplements probably will not help hair growth, while a systematic review of oral hair supplements and several small open-label or animal/cell studies report some improvements in hair measures, though collagen is often only one ingredient and human evidence is described as heterogeneous.

Verdict: CONTESTED PARTIAL · 5 sources for, 1 against · Last checked 2 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5

Evaluating the Effectiveness of Commercial Oral Supplements for Hair Growth: A Systematic Review and Meta-Analysis.

2026

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R, A., S, A., K, A., R, A., D, A., S, A., A, A., A, A., & A, A. (2026). Evaluating the Effectiveness of Commercial Oral Supplements for Hair Growth: A Systematic Review and Meta-Analysis.. doi.org. https://doi.org/10.1111/jocd.70817

Evidence against · 1

Does Collagen Help Hair Growth?

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Does Collagen Help Hair Growth?. (n.d.). health.clevelandclinic.org. https://health.clevelandclinic.org/collagen-for-hair-growth

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More for · 4

Hair-Growth-Promoting Effects of the Fish Collagen Peptide in Human Dermal Papilla Cells and C57BL/6 Mice Modulating Wnt/β-Catenin and BMP Signaling Pathways -

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Hair-Growth-Promoting Effects of the Fish Collagen Peptide in Human Dermal Papilla Cells and C57BL/6 Mice Modulating Wnt/β-Catenin and BMP Signaling Pathways - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.3390/ijms231911904

Dietary Collagen Supplementation as a Strategy for Skin Health: A Narrative Review of Clinical Effects on Skin, Hair, Nails, and Wound Healing.

2026

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A, B., M, J., I, F., & E, Z. (2026). Dietary Collagen Supplementation as a Strategy for Skin Health: A Narrative Review of Clinical Effects on Skin, Hair, Nails, and Wound Healing.. doi.org. https://doi.org/10.3390/nu18132141

Effects of Oral Supplementation of TrichovitalsTM on Human Skin, Hair and Nail Physiology

2021

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Effects of Oral Supplementation of TrichovitalsTM on Human Skin, Hair and Nail Physiology. (2021). doi.org. https://doi.org/10.52711/2321-5844.2021.00008

Effects of Oral Supplementation of Muttaijow complexTM on Human Skin, Hair and Nail Physiology

2021

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Effects of Oral Supplementation of Muttaijow complexTM on Human Skin, Hair and Nail Physiology. (2021). doi.org. https://doi.org/10.52711/2321-5844.2021.00005

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