What Does Hair, Skin & Nails Do? Hair, Skin & Nails Provides A Blend Of Carefully Selected Vitamins And Minerals That Contribute To The Normal Maintenance Of Skin, Hair And Nails. ThatS Why WeVe Included Vitamin A, B2, B3, Zinc, Selenium, Iodine And Copper As They All Contribute To The Normal Maintenance Of Skin. Selenium, Zinc And Copper Also Contribute To Normal Maintenance Of Hair, With Selenium And Zinc Contributing To The Normal Maintenance Of Nails. Suitable For Vegans Hair, Skin & Nails Is Suitable For Vegetarians And Vegans. It Is Also Approved Kosher And Does Not Contain Any Major Allergens