Two copper peptides dominate procurement conversations in the cosmetics industry: GHK-Cu (copper tripeptide-1) and AHK-Cu. Both are peptide-copper complexes, both are supplied as cosmetic-grade powders, and both appear in premium skincare lines. Yet they are different raw materials with different sequences, physical characteristics and product positions. This article compares them from a formulator and buyer perspective.
The Basics: Two Tripeptides, Two Copper Complexes
GHK-Cu is built on the tripeptide glycyl-histidyl-lysine. It is the most widely documented copper peptide and is supplied as a fine powder for skincare formulations. AHK-Cu is built on a different tripeptide sequence (alanine-histidine-lysine) and is also referenced in some ingredient catalogs as copper tripeptide-3. When you request quotes, use the INCI-style name printed on the specification sheet to avoid confusion between the two — identical marketing names are occasionally reused by different suppliers.
Formulation Positioning at a Glance
- GHK-Cu is a general-purpose copper peptide for anti-aging skincare lines, commonly used in serums, creams and eye-care products. Its extensive documentation history makes it a default first choice for formulators building a copper peptide range.
- AHK-Cu is increasingly positioned in hair and scalp care product lines, while also appearing in facial serums. If your brief is a scalp product, read our guide on AHK-Cu in hair and scalp care before finalising the formula.
Physical and Specification Differences
The two materials also look different in powder form, which makes visual inspection a useful first check when a batch arrives:
- GHK-Cu is supplied as a fine, light-coloured powder in cosmetic grade.
- AHK-Cu is commonly supplied as a dark purple granular powder — the copper complex gives the material its distinctive colour. Verify the expected appearance against the COA when you receive the goods.
Buying Considerations
From a purchasing standpoint the two products share the same diligence requirements: request a specification sheet, ask for COA documentation, confirm packaging (double-layer plastic and foil is standard for peptides) and storage guidance, and arrange samples before bulk commitment. Many buyers purchase both materials from one manufacturer to simplify documentation and freight — both are available on request alongside other cosmetic peptides.
Which One Should You Choose?
Start from the product brief, not the ingredient trend. For a broad skincare range anchored on copper peptide technology, GHK-Cu is the natural base. For a scalp or hair-positioned line, AHK-Cu deserves evaluation alongside other hair-positioned peptides. If your project spans both directions, sourcing both from the same supplier keeps quality documentation consistent.
Compare the two specifications side by side on our GHK-Cu product page and AHK-Cu product page, then submit your quantities through the inquiry form for a quotation with COA documentation.
Related reading: the GHK-Cu sourcing guide and copper peptides in skincare: stability and formulation tips.
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