Biotin is an important nutrient and a biotin deficiency can cause weak hair and nails.
Unfortunately, while biotin supplements have promising studies, topical biotin in creams, serums, and other products doesn’t have large body of evidence to back it up.
Science
1
National Institutes of Health, Biotin, Fact Sheet for Health Professionals, June 3, 2020 https://ods.od.nih.gov/factsheets/Biotin-HealthProfessional/#h2
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