Comment on Top 6 Vitamins for Hair Growth (#2 Is Essential) by Erica Crockett Pierre Van Zyl2nd May 2018Collagen FAQ (Frequently Asked Questions) Share www.GetCollagen.co.zaWhat is the appropriate dosage of each of these vitamins/minerals to take for hair loss without risking taking too much?? Vitamin E Vitamin D Biotin Iron Zinc Source: Dr Axe