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Loren Pickart, GHK-Cu is found in plasma, saliva, and urine with plasma concentrations declining significantly with age, from approximately 200 ng/mL at age 20 to 80 ng/mL by age 60

Ye Z, Xia Y, Li L, Li B, Chen L, Yu W, et al

HUBERMAN: So again, you want to avoid food in the hour and a half, probably two hours before taking them, and certainly in the half hour or longer after, which is why most people take them right before going to sleep, and add or augment that big growth hormone pulse that occurs in the early part of the night

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