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From a receptor standpoint, there is no overlap
These ranges come from animal studies and informal reports
In double-blind, placebo-controlled trials, daily application of GHK-Cu cream at 3% concentration for 12 weeks produced a 70% increase in skin collagen thickness as measured by ultrasound imaging, a 40% increase in skin elasticity, and visible reduction in fine lines and wrinkles
Combined nicotinamide N-methyltransferase inhibition and lean-diet substitution reduces body weight and liver fat in obese mice
Six trials totaling roughly 900 participants are summarized in Stier et al
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