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They're like an ingredient so probably not a by itself type thing. Most skincare products hardly do anything; the only ones that do shit are...

Not a pharmaceutical but you can buy TCA online for cheap and rub it on your face for an aggressive DIY chemical peel. It's pretty much guaranteed...

GHK-Cu is one that's commonly sold for skin health. You can buy cosmetic grade, which is usually just loose crystals that you mix into lotions or...