Methionine concentration naturally decreases with age
Methionine is needed for the uptake of cysteine
Two of the most important are the amino acids cysteine and methionine. Cysteine is the amino acid in alpha-keratin, the major protein found in hair, skin and nails. It promotes collagen production and is largely responsible for skin elasticity and texture. Both methionine and cysteine are also powerful antioxidants and detoxifying agents.
Cysteine is created by the body, but only with adequate quantities of methionine. As methionine production is reduced by stress, illness and aging, cysteine production also decreases (Skincare-news). Considering cysteine in particular is regarded in the hair and nails as a revitalizing agent, stimulating the growth of both the hair and the nails in a statistically-significant manner, and enhancing anti-static resistance of the hair (J. Applied Cosmetology, 2012), it is extremely important that cysteine uptake is maintained within aging skin, hair, and nails!
Based on these studies, it may be beneficial to use a regimen that includes methionine. We recommend any of the AminoGenesis products with sleek black packaging — all contain 17 amino acids, including methionine.