For most younger women, thinning hair is caused by incomplete protein digestion as a result of insufficient stomach acid and pepsin production. Poor protein digestion results in low levels of essential amino acids and essential minerals. Without sufficient essential amino acids, hair starts to thin out. The problem can be stopped by supplementation with hydrochloric acid-pepsin capsules with meals, as well as with individualized essential amino acid and mineral supplements. Birth control pills and pregnancy can occasionally cause hair loss, too. B-complex vitamins – especially folate and vitamin B6 -- will reverse this effect. Suggestions for thinning hair: Rodex Forte, Vitamin B-6, and Hair Health