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Y. Xionget al., Neuroprotective and neurorestorative effects of thymosin 4 treatment following experimental traumatic brain injury, Wiley, Oct. 2012. doi: 10.1111/j.1749-6632.2012.06683.x

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

Journal of pharmaceutical and biomedical analysis, 2008, 47(3): 596- 602

Mitra, M