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"A standardized Withania somnifera extract significantly reduces stress-related parameters in chronically stressed humans: a double-blind, randomized, placebo-controlled study." JANA 11 (2008): 50-56

The antioxidant function of GSH is determined by the redox-active thiol (-SH) of cysteine that becomes oxidized when GSH reduces target molecules (Pompella et al., 2003)

doi: 10.1007/s00394-009-0035-9 68 ReuterSGuptaSCChaturvediMMAggarwalBB

For hair restoration specifically, some protocols combine subcutaneous GHK-Cu with direct scalp injection (mesotherapy) to deliver the peptide closer to the follicle bulb

10.1016/S0140-6736(89)91909-0 Lancet 23 CaiJ.ChenY.SethS.FurukawaS.CompansR