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This is done to treat clinically diagnosed low testosterone, a condition known as hypogonadism

So even the topical route, which is the evidence-backed one, should be described as supported by small, sometimes industry-affiliated human cosmetic studies with modest effect sizes, not as proven. The correct posture toward topical GHK-Cu is cautious optimism grounded in real but imperfect human data which is still a materially stronger position than the injectable route can claim

Sci.: Sci

Pollard & Pomfrett suggest that DSIP administration doesnt induce tolerance,4 but theirs isnt the consensus conclusion

This route dependence is why GHK-Cu dosage cannot be expressed as a single universal figure