is glutathione the body's master antioxidant Antioxidant? Here’s What Science Says Glutathione! - PMC

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PubMed PMID: 3777154

The collagen-derived compound collagen tripeptide induces collagen expression and extends lifespan via a conserved p38 mitogen-activated protein kinase cascade

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However, as oxidative stress increases, the permeability of this barrier increases, and free radicals can cross the barrier