8. Black Beans
Lysine is an essential amino acid that plays an important role in iron and zinc uptake. Given what we've already told you about hair and those key nutrients, it's not surprising that lysine has been shown to encourage the growth and development of healthy hair. In fact, a 2012 study printed in the journal Clinical and Experimental Dermatology showed that the addition of lysine to iron supplementation significantly helped some women with chronic thinning hair and hair loss who failed to respond to iron supplementation alone. Black beans, which are packed with protein, are also loaded with lysine. A half-cup serving of the legumes contains an impressive 523 milligrams of the essential amino acid.
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