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GHK-Cu has a science-heavy backstory, but interest usually comes down to visible outcomes

Evidence gaps No published human randomized trial has evaluated injectable GHK-Cu for cosmetic, hair, or wound endpoints

While it may not reverse advanced baldness, it shows great promise in slowing thinning, supporting regrowth in weakened follicles, and enhancing overall scalp health

There are accounts of potential toxicity or side effects that are not yet fully mapped, and some researchers have voiced public concerns with both safety and efficacy

Below are the benefits experimenters report many favorable outcomes

It increases the proportion of slow-wave sleep (delta, 0.5-4 Hz) without suppressing REM sleep, unlike GABAergic hypnotics