functions of glutathione The antioxidant Essential Glutathione Glutathione - Wikipedia

This amino acid combination allows researchers to study immune system interactions, inflammatory responses, and tissue repair processes across multiple biological pathways

10.1016/j.regpep.2012.12.007 9 BecejacT.CesarecV.DrmicD.HirslD.MadzaracG.DjakovicZ.et al (2018)

GPX3, similar to GPX1, is located at a low level of the selenoprotein level and is sensitive to selenium content in the body, so it is often used as a biological marker to measure selenium content in the body

That's a meaningfully different claim than what most product pages make

Use within 28 days of opening, and keep tools sterile to prevent contamination

(13) GHK is proposed to act as an endogenous antioxidant, potentially due to its selective targeting and neutralization of certain radicals, specifically hydroxyl (OH) and peroxyl (ROO) radicals