Opal Beauty
Ingredient guide
AHK-Cu, explained clearly.
A focused guide to the copper-binding tripeptide used in Opal's scalp-focused cosmetic formulas — what the research studied, how concentrations differ, and what a daily routine can realistically promise.
What is AHK-Cu?
AHK-Cu is a copper-binding tripeptide also listed as Alanine/Histidine/Lysine Polypeptide Copper HCl. Opal uses it as a disclosed cosmetic active in scalp serums designed to support the appearance and feel of hair and scalp.
What has been studied?
AHK-Cu has been studied in isolated human hair follicles and cultured dermal papilla cells. Those laboratory findings inform ingredient interest, but they do not predict a specific result for every topical formula or person.
Why concentration matters
Opal lists the actual AHK-Cu concentration: Follicle Fuel at 1.0%, Root Surge at 2.5%, and Root Matrix at 1.0% AHK-Cu alongside 0.5% GHK-Cu. A higher percentage does not guarantee a better individual result.
How to choose
Choose Follicle Fuel for full-scalp daily application, Root Surge for a more targeted routine, or Root Matrix when you want two transparent copper-peptide actives in one formula.
Cosmetic expectations
Use consistently, apply to scalp skin rather than the hair shaft, and judge appearance and feel over time in consistent lighting. Opal does not promise regrowth, treatment, disease prevention, or a guaranteed individual outcome.
Explore the full formulas
Every hair product page includes its concentration, INCI list, application steps, storage guidance, and routine expectations.