Strong evidenceamino_acid
Collagen for Brittle Nails
Collagen peptides provide structural amino acids for nail matrix keratin synthesis. Increases nail growth rate.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceHexsel D et al. · Journal of Cosmetic Dermatology 2017How much to take
2.5–5 g
Limited but promising evidence. Effects observed after 24 weeks of consistent supplementation.