glutathione reactions catalysis and the reaction mechanisms of glutathione-dependent enzymes Glutathione-Mediated Conjugation of Anticancer Drugs:

It suggests that low concentrations of epitalon could have an inhibitory effect on cancer cells and telomere length extension

Adiponectin provides protective metabolic signaling and declines with adiposity, lifting a brake on inflammation and insulin sensitivity that then affects estrogen and progesterone homeostasis

demonstrated dose-dependent proliferation effects on cultured human dermal papilla cells exposed to GHK-Cu at physiologically relevant concentrations.3 Subsequent work has confirmed that this effect translates into upregulation of genes associated with anagen-phase activity including VEGF, FGF-2, and IGF-1, the three growth factors most directly implicated in hair-cycle regulation

Seal, 2000

When it comes to supplementing with substrates, glycine may be just as important as cysteine