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Even if you do not fall into the strict "avoid" categories, you should exercise heightened caution and consult a physician before using GHK-Cu if you: Are currently pregnant or breastfeeding Have a known copper metabolism disorder (like Wilson's disease) Have a history of severe allergic reactions to cosmetics or metals Have significant underlying medical conditions affecting the liver or kidneys How Long Does GHK-Cu Take to Work

PMID: 6782675 Wang YM, Liu JB, Peng SQ

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Andrew Huberman: We could do an entire episode all about cold, but what I'd love to know is what sort of activity or stimulus do you think is a reasonable and particularly potent one to use in terms of cold