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This is also why GHK-Cu appears frequently in longevity-adjacent research alongside other compounds studied for age-related cellular changes, since a quantifiable, age-correlated decline gives researchers a concrete variable to test against rather than a purely theoretical one
Dark spots from old acne
This was the upper limit of quantitation of assays performed in the early days of research regarding paracetamol poisoning and has empirically been maintained as the definition for liver injury since then *
Another study in older adults showed whey protein (40g daily) raised glutathione by 24% and reduced oxidative stress [16]
Sonksen P
Oncol Rep 14(1):8184 Nico B et al (2010) Intussusceptive microvascular growth in human glioma
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