Viviscal Extra Strength hair vitamin supplements for women nourish thinning hair and promote existing hair growth from within.Viviscal Extra Strength dietary supplements supply vital nutrients to the hair follicle to prolong the anagen (growing) phase of the hair growth cycle, nourishing thinning hair and promoting hair growth. Viviscal Extra Strength dietary supplements contain the exclusive marine complex AminoMar®, as well as Biotin, Zinc, Vitamin C, Horsetail Extract and Iron, to nourish hair from within.