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People with absorption issues need supplementation even with adequate dietary intake
Oral administration offers convenience but can suffer from reduced bioavailability, while injectables provide higher precision and predictability
J.WilsonS.HuX
(2012) in Journal of Aging Research confirmed that GHK-Cu increased skin density and thickness, counteracting the natural decline in GHK-Cu levels (from 200 ng/ml at age 20 to 80 ng/ml at age 60) that exacerbates wrinkles (Pickart et al., 2012)
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