ghk-cu recommended dosage injectable Dosing: 1.7mg/Day (2026) KLOW Dosing Guide: GHK-Cu +

The changes are typically gradual, but they support long-term skin health and can enhance the effects of other actives. Their gentleness and versatility, though, can make peptides somewhat like skincare unicorns, particularly if you get regular in-office treatments or use products with retinol, hyaluronic acid, niacinamide, and/or ceramides, since peptides complement these ingredients

For a longer Retatrutide protocol of 20 to 24 weeks, GHK-Cu can run for the first 12 weeks, take a 4 to 6 week break while Retatrutide continues, then resume for another 8 to 12 week cycle

Jose et al

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While both cell types showed increased HO levels, no intergroup differences emerged