GNC Biotin 5000 mcg: Supports Healthy Hair, Skin & Nails* GNC Biotin 5000mcg is a supplement that provides a vitamin important to the development and maintenance of healthy skin, nails and hair.

Without the nerve cells in skin ... shaft of the hair. Hair grows all over the human body except the palms of the hands, soles of the feet, and lips. Hair grows faster in summer than winter, and ...