Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails.
J Cosmet Dermatol. 2017 Dec;16(4):520-526. doi: 10.1111/jocd.12393. Epub 2017 Aug 8.
J Cosmet Dermatol. 2017.
PMID: 28786550
Clinical Trial.