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Although some peptides may reach the small intestine unchanged, many of them will likely be broken down during digestion

The "right" dose sits in a narrow window that depends on: Delivery method - injectable GHK-Cu vs topical GHK-Cu vs oral/sublingual GHK-Cu Goal - skin rejuvenation , hair and scalp support, wound healing , general anti-ageing Individual factors - age , skin type , baseline GHK levels , other peptides being stacked Natural plasma GHK falls from roughly 200 ng/ml at age 20 to around 80 ng/ml by age 60

However, Kang et al

For reduction experiments BSO-OxOAc (2 mM) was dissolved in phosphate buffer (500 mM, pH 7.4)