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People with G6PD deficiency should avoid high doses or combinations with vitamin C, as this may cause harmful side effects like red blood cell breakdown
Other peptides, including AOD-9604, Retatrutide, CJC-1295, and MOTS-c, either have limited evidence or are still being studied
The evidence for injectable GHK-Cu producing systemic skin benefits is thin compared to topical use
Community sources consistently cite round-number concentrations as the most important practical safeguard simpler math means fewer dosing errors
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