2 citations,
January 2019 in “Elsevier eBooks” Biotin supplements are unnecessary for most people but may help with certain conditions like biotin deficiency, brittle nails, and some hair loss.
December 2021 in “Trichology and cosmetology:” Taking Kera-Diet® improves hair and nail health without side effects.
January 2019 in “Journal of cosmetology & trichology” L-Cystine and L-Cystine with Kera-Diet® safely improved hair and nail quality in healthy women.
7 citations,
July 2021 in “PubMed” Vitamins A, B, C, and D are important for skin health and are being explored for new uses, but more research is needed to confirm their effectiveness.
19 citations,
January 2018 Most people with alopecia areata have nail changes, which are common but don't greatly affect their quality of life.