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Light Exposure: Peptides, including GHK-Cu, are photosensitive
It took 25 years for the agency to approve a new UV filter for sunscreen, largely because of the extensive safety, toxicology, and absorption data the agency required before signing off
Additionally, the government negotiates prices on behalf of the provinces, whereas in the US, prices are largely determined by market forces and private insurance negotiations
Using more than necessary can be counterproductive
There is no established therapeutic dose, and claims about metabolic benefits lack robust clinical validation
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