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GHK-Cu (glycine-histidine-lysine-copper) is a tripeptide that occurs naturally in human plasma, with concentrations declining significantly after age 60

Topical applications may achieve only 5-15% absorption depending on formulation and skin condition

The safest and most reliable solution to reduce chlorine and DBPs in drinking water is to install a whole-house water filter system with a UV post-filter to eliminate microbes that may have entered the water after leaving the treatment plant

Goal-Specific Dosing Considerations The optimal MOTS-c dose is not one-size-fits-all: it shifts depending on whether the clinical goal is metabolic correction, athletic performance enhancement, or anti-aging and longevity support

They're functionally different interventions with different absorption profiles, different target tissues, and different reasons to choose them