what is the best supplement for hair regrowth?
['Vitamin A. All cells need vitamin A for growth. ... ', 'B-Vitamins. One of the best known vitamins for hair growth is a B-vitamin called biotin. ... ', 'Vitamin C. Free radical damage can block growth and cause your hair to age. ... ', 'Vitamin D. ... ', 'Vitamin E. ... ', 'Iron. ... ', 'Zinc. ... ', 'Protein.']