BIO-H-TIN 5mg, 60 tabletsBIO H TIN 5 mg tablets contain biotin as the active ingredient. Biotin is also known as vitamin H or skin vitamin because it is essential for keeping skin, hair and nails healthy. 1. What is BIO H TIN 5 mg and what is it used for? BIO H TIN 5 mg tablets contain biotin as the active ingredient. Biotin is also known as vitamin H or skin vitamin, as it is essential for keeping the skin and skin appendages (hair and nails) healthy. Like all vitamins,