In most mammals, melanin formation consists of eumelanin (brown-black pigment) and pheomelanin ( yellow-red pigment) as either mixtures or copolymers
Also, injectable glutathione is not approved for skin lightening in many countries
2014), confirmed in the larger Cochrane meta-analysis of 42 RCTs (Franik et al
As noted above, Trxs are responsible for reducing Prx back to their reduced, oxidant-scavenging state, while thioredoxin reductases (TrxRDs) keep the reduced state of Trxs using NAPDH reducing equivalents, as depicted in Figure 2
Mechanistic studies of the plant GCL demonstrated that reversible disulfide bond formation alters catalytic activity with the oxidized protein more active than the reduced protein (Jez et al., Subsequent crystallographic and functional studies established the molecular basis for this thiol-based redox-switch