{"id":"collagen-peptides","name":"Collagen peptides","aliases":["hydrolysed collagen","collagen hydrolysate","bioactive collagen peptides","collagen supplement"],"url":"https://lyoresearch.com/compounds/collagen-peptides","class":{"id":"supplement-peptides","name":"Peptides sold as supplements","url":"https://lyoresearch.com/classes/supplement-peptides"},"summary":"Collagen peptides are collagen broken down by enzymes into short chains that dissolve in water and are sold as powders for skin, joints and hair. Meta-analyses of the small trials find improved skin hydration and elasticity, but the 2025 analysis that separated trials by funding found the effect only in industry-funded and low-quality studies; independent, high-quality trials showed none. Joint-pain trials are similarly mixed. It is a food supplement, safe, and probably doing less than the label says.","overall_grade":"C","overall_grade_meaning":"weak human evidence","human_trials":"20+ small RCTs; meta-analyses disagree by funding and quality","regulatory_status":"Food supplement","molecule":{"formula":null,"molecular_weight":null,"cas":null,"pubchem_cid":null,"note":"A mixture of peptides of varying length from hydrolysed collagen — no single molecular identity"},"pharmacokinetics":{"basis":"none","route":"Oral (powder or capsules)","half_life":"Not applicable — a mixture digested to peptides and amino acids; no single half-life","licensed_regimen":null,"product":null,"source":null},"outcomes":[{"outcome":"Skin hydration and elasticity","grade":"C","grade_meaning":"weak human evidence","effect_size":"small","adverse":false,"human_studies":"23–26 RCTs in meta-analyses (n≈1,500–1,700)","evidence":"Pooled across all trials the effect is positive; sorted by funding and quality, the independent and high-quality trials show no benefit. Two meta-analyses reach opposite conclusions on the same literature, which is itself the finding.","references":[{"citation":"Myung SK, et al. Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials.","where":"Am J Med, 2025","url":"https://pubmed.ncbi.nlm.nih.gov/40324552/"},{"citation":"Pu SY, et al. Effects of oral collagen for skin anti-aging: a systematic review and meta-analysis.","where":"Nutrients, 2023","url":"https://pubmed.ncbi.nlm.nih.gov/37432180/"}],"verbatim":{"text":"However, in the subgroup meta-analysis by funding source, studies not receiving funding from pharmaceutical companies revealed no effect of collagen supplements for improving skin hydration, elasticity, and wrinkles, while those receiving funding from pharmaceutical companies did show significant effects.","citation":"Myung SK, et al. Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials.","url":"https://pubmed.ncbi.nlm.nih.gov/40324552/"}},{"outcome":"Joint pain and function","grade":"C","grade_meaning":"weak human evidence","effect_size":"small","adverse":false,"human_studies":"Several small RCTs; one 9-month trial (3 arms)","evidence":"A 9-month trial in active adults found improved daily-activity and pain scores on 10 g a day, but the pain effect appeared only in a subgroup of frequent exercisers. Other trials in knee osteoarthritis report small improvements; none is large.","references":[{"citation":"Kviatkovsky SA, et al. Collagen peptides supplementation improves function, pain, and physical and mental outcomes in active adults.","where":"J Int Soc Sports Nutr, 2023","url":"https://pubmed.ncbi.nlm.nih.gov/37551682/"}],"verbatim":{"text":"Improvements in ADLs (p = .031, ηp2 = .096) and pain (p = .037, ηp2 = .164) were observed with 10 g/d CP over 6 months, although pain only improved in high frequency exercisers (>180 min/week).","citation":"Kviatkovsky SA, et al. Collagen peptides supplementation improves function, pain, and physical and mental outcomes in active adults.","url":"https://pubmed.ncbi.nlm.nih.gov/37551682/"}},{"outcome":"Safety","grade":"B","grade_meaning":"probable, not settled","effect_size":"not measurable","adverse":true,"human_studies":"All trials","evidence":"No safety signal in any trial; it is digested like any dietary protein. The risk is to the wallet, not the body.","references":[{"citation":"Pu SY, et al. Effects of oral collagen for skin anti-aging: a systematic review and meta-analysis.","where":"Nutrients, 2023","url":"https://pubmed.ncbi.nlm.nih.gov/37432180/"}]}],"regions":[{"region":"European Union","status":"Food supplement","note":"Sold as food; no authorised health claim for skin or joints under the EU claims register."},{"region":"United States","status":"Dietary supplement","note":"Sold under DSHEA; structure/function claims only."},{"region":"United Kingdom","status":"Food supplement","note":"Food law; no authorised health claim."},{"region":"Australia","status":"Food or listed complementary medicine","note":"Depending on presentation."},{"region":"Canada","status":"Natural health product","note":"Licensed NPN products exist with limited claims."},{"region":"Sport (WADA)","status":"Not prohibited","note":"Not on the Prohibited List."}],"faq":[{"q":"Do collagen peptides work for skin?","a":"The pooled trials say a little; the independent, high-quality trials say no. The 2025 meta-analysis that made that split concluded there is no clinical evidence to support the use for skin ageing."},{"q":"Do collagen peptides help joints?","a":"Small trials report small improvements in pain and function, often in subgroups. Nothing large or independent settles it."},{"q":"Is it safe?","a":"Yes. It is a food protein; no trial has found a safety problem."}],"references":[{"cite":"Myung SK, et al. Effects of collagen supplements on skin aging: a systematic review and meta-analysis of randomized controlled trials.","where":"Am J Med, 2025","url":"https://pubmed.ncbi.nlm.nih.gov/40324552/","note":"23 RCTs, 1,474 participants; analysed by funding source and quality."},{"cite":"Pu SY, et al. Effects of oral collagen for skin anti-aging: a systematic review and meta-analysis.","where":"Nutrients, 2023","url":"https://pubmed.ncbi.nlm.nih.gov/37432180/","note":"26 RCTs, 1,721 participants; positive pooled effect, biases noted."},{"cite":"Kviatkovsky SA, et al. Collagen peptides supplementation improves function, pain, and physical and mental outcomes in active adults.","where":"J Int Soc Sports Nutr, 2023","url":"https://pubmed.ncbi.nlm.nih.gov/37551682/","note":"Three-arm RCT, 9 months."}],"last_reviewed":"2026-09-23","literature_searched_to":"2026-09-23","changelog":[{"date":"2026-09-23","note":"Initial publication. Grade C: many small trials, effect dependent on funding and quality."}],"license":"CC BY 4.0 — cite as “LYO Research” with a link.","methodology":"https://lyoresearch.com/methodology"}