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Combination therapies using L-cysteine and glutathione showed enhanced brightening effects, supporting their use in skin rejuvenation programmes
Dimet-Wiley A, Wu Q, Wiley JT, et al
Notably, most clinical investigations studied women (1404 female versus 83 male participants), which is expected since estrogen declines after age 30 years, and further estrogen decline with aging represents health challenges, as well as a reduction in QOL [9, 10, 19,20,21,22] and a degradation in the most visible organ of the bodythe skin [9, 10]
But this connection was never certain
It degrades rapidly in the bloodstream, making it impractical as a daily medication without significant modification
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