weirdly metallic taste after injection. anyone else

oh that's actually really interesting. thanks

GHK-Cu specifically — the copper can cause a transient metallic taste. Well-documented. Harmless. It's the compound, not you.

first time i got this I thought i was dying. it's just the copper.

If the taste persists for hours or you feel nauseous, that's a different conversation. Transient metallic = copper, fine.