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For convenience and needle aversion : Oral GHK-Cu is the easiest option, but understand that systemic benefits will be significantly limited by poor bioavailability
These figures are useful for purchasing decisions before starting
When the experiment was run in serum-containing medium the distinction partly collapses anyway, because free GHK will acquire copper from the medium, but that only means the effective species was never under the experimenter's control
Premature Ageing Glutathione reduces oxidative stress that contributes to fine lines, wrinkles, and loss of elasticity
PMID 16583442
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