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Existing data come exclusively from preclinical (animal) literature
Beyond collagen, GHK-Cu boosts elastin production by 30% and increases decorin, a small proteoglycan that regulates collagen organization, by 302% at 1 nanomolar concentration
398, ISBN 0-12-181977-9
doi: 10.1111/1365-2435.12778 64
Glutathione is not a stimulant and typically does not interfere with sleep
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