Very high concentrations or excessive application frequency are more likely to trigger irritation without a proportional benefit, and the dose-response relationship for cosmetic GHK-Cu is not precisely defined in the literature
It is also unusually stable in gastric acid, which is why oral dosing is even theoretically plausible
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I have never had vomiting or nausea as a side effect of my jabs (Ive just finished my loading doses 6 weeks ago) but I have thrown up my vit d tablets and felt sick occasionally, mainly when not taking them with food
doi:10.1093/eurheartj/ehae244 Schiffman SS, Scholl EH, Furey TS, Nagle HT