Vitamin B7 (biotin) promotes healthy hair, skin, and nails, and aids in the metabolism of fats and carbohydrates

https://www.scribd.com/document/750054896/Vitamines-B-Essential-Nutrients-for-a-Healthy-Body-and-Mind-142586

Vitamin B7 (biotin) promotes healthy hair, skin, and nails, and aids in the metabolism of fats and carbohydrates