Collagen Powder for Nails
One reason why collagen peptide powder may be a good supplement to take for your nails is because it's high in the amino acid, arginine. Collagen peptides contain 18 of the 20 amino acids. Arginine is one of them. This creates Nitric Oxide which is essential for bringing blood and nutrients to nail roots.
A study published in the Journal of Cosmetic Dermatology investigates if and how collagen peptides benefits the nails. The subjects supplemented with the collagen peptide powder once a day for 24 weeks.
The results: supplementing with collagen peptides promoted an increase of 12% nail growth rate and a decrease of 42% in the frequency of broken nails. Moreover, about two-thirds of the subjects reported better outcomes with brittle nails. And almost 90% of the participants showed improvement even after the 4 weeks of not taking the collagen peptides. "The majority of participants (80%) agreed that the use of collagen peptides improved their nails' appearance, and were completely satisfied with the performance of the treatment," concluded the study authors.