Healthy Hair Growth Supplements may combat hair loss with DHT inhibiting botanicals plus Biotin, Niacin and Zinc for thicker, fuller looking hair. Biotin helps strengthen the hair follicle while Niacin and Zinc maintain healthy hair and reduce shedding. Pumpkin Seed Extract, available in the Men's Healthy Hair Supplements, is a natural DHT-blocking ingredient rich in vitamins and minerals. May also improve the appearance of skin and nails.