One small study with amino acid supplements, including L-glutamate (which converts to glutathione in the body), showed improved skin hydration and elasticity
Filaggrin is a protein that binds structural proteins in the outer skin layer together to form a tight barrier that shields against allergens, bacteria, and moisture loss
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Beyond brightness, glutathione also defends your skin from UV damage, pollution, and inflammation, key factors that accelerate dullness and pigmentation
There are also numerous reports from both males and females stating that an unexpected side effect (or benefit) of Biotin, was that it noticeably improved their sex drive - however, there is no factual scientific evidence to support this, other than improving their overall health by supplementation