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Side effects are rare but may include temporary scalp sensitivity or minor irritation

Protect it from light to prevent photo-oxidation of Cu2+

Common doses are 2 to 5 milligrams per week, split into 2 or 3 shots, for 4 to 8 weeks

The ratio of GHK to Cu is 2:1 according to manufacturer data

It is the most studied, the most recommended, and the simplest to track

Since baseline collagen production is known to decline roughly 1% per year starting in the mid-20s, a compound that reactivates a suppressed signaling pathway rather than simply adding raw material is mechanistically interesting in a way that most topical actives aren't