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No formal guideline establishes a threshold, but the Recommended Dietary Allowance for copper is 900 micrograms per day in adults, and daily injectable GHK-Cu doses in compounding protocols commonly range from 1 to 3 mg, delivering copper well above that if administered daily (11)
In one case, a man who ate mostly canned beef developed scurvy twice
A.NakamuraK.CookS.CadavidD.WolanskyL.et al
At age 20, plasma contains approximately 200 ng/ml of GHK-Cu, dropping to just 80 ng/ml by age 60
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