ghk-cu kit – Research Peptide designed to support optimal absorption into the skins upper layer GHK-Cu — Research Kit |

Copper toxicity Though its unlikely, copper peptide skin care products may lead to potential copper toxicity if not used as directed by the manufacturer (or if multiple copper-containing products are used together)

Patients whose only complaint is weight and who have no secondary concerns about skin, hair, inflammation, or tissue quality are better served by optimizing their GLP-1 protocol, adding resistance training, and addressing nutrition rather than adding a peptide that doesnt directly address their primary goal

This is particularly disappointing because, despite being a copper peptide isolate serum with the fewest key ingredients, NIODs product comes in second for the highest cost per mL (Allies of Skins serum comes in first, but closes the gap a bit when the subscription price is lowered after the fifth order)

GHK-Cu has five, with primary-literature support for each

Novo Nordisk filed an NDA for the CagriSema combination in December 2025, with an FDA decision anticipated in late 2026