l carnitine benefits for hair L-Carnitine Benefits, Sources, and Side Effects L Cysteine Hair | Benefits,
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Two points worth noting here
10.3389/fpsyt.2021.596601 31 BrancatoA.CastelliV.LavancoG.MarinoR
In males, it has been found to significantly increase free testosterone levels, decrease estrogen levels as well as decrease inflammation markers CRP (50% decrease) and TNF- (30% decrease)

They talked about it like something fundamentally connected to how the body handles stress and biological wear