GHK-Cu vs AHK-Cu: fast selection guide for skin and scalp formulas
For most skin-care formulas, start with GHK-Cu / Copper Tripeptide-1. For more targeted scalp-care and hair-appearance concepts, evaluate AHK-Cu as a separate copper peptide route. The two materials are related, but they are not interchangeable grades. A buyer should qualify each one by identity, assay, copper content, pH handling, storage conditions, COA, specification sheet and target-market label review.
| Decision point | Choose GHK-Cu when… | Evaluate AHK-Cu when… |
|---|---|---|
| Primary format | You are building a broader skin-care serum, cream, ampoule or topical cosmetic system. | You are building a scalp-care, hair-appearance or localized topical concept. |
| Ingredient identity | You need the common Copper Tripeptide-1 cosmetic route, qualified by current specification and COA. | You need a distinct AHK-Cu route and will confirm exact labeling identity from the supplied specification. |
| Supplier review | Request GHK-Cu assay, copper content, heavy metals, microbiology, SDS and sample support. | Request AHK-Cu assay, copper content, heavy metals, microbiology, SDS and sample support. |
| Claim boundary | Keep the claim route in skin-appearance and cosmetic formulation language. | Keep the claim route in scalp-care, hair-appearance and cosmetic formulation language. |
Nutrition BioTech supplies both routes for B2B formulation review. Start from the GHK-Cu and AHK-Cu copper peptide supplier page, then review the GHK-Cu / Copper Tripeptide-1 guide, the AHK-Cu scalp-care guide and the copper peptides for formulators hub.
Next step: request side-by-side COA/specification review or samples for the copper peptide route that matches your formula format.
Short answer: GHK-Cu and AHK-Cu are two different copper peptides, not two grades of one ingredient. GHK-Cu is glycine-histidine-lysine chelated to copper; AHK-Cu is alanine-histidine-lysine chelated to copper. In cosmetic practice, GHK-Cu is the broader, more widely used copper peptide across general skin-appearance formats, while AHK-Cu is the more specialised peptide most often formulated into scalp and hair-appearance products. Choose on category fit, format, use level and documentation — not on health-outcome claims.
This page compares the two materials side by side. For the wider category framing — how to evaluate copper peptides as a class, and where the claim boundaries sit — see the copper peptide selection guide for formulators. For the full identity and specification detail on each material, see GHK-Cu (Copper Tripeptide-1) and AHK-Cu.
GHK-Cu vs AHK-Cu at a glance
| Property | GHK-Cu | AHK-Cu |
|---|---|---|
| Peptide composition | Glycine–histidine–lysine, chelated to copper | Alanine–histidine–lysine, chelated to copper (one amino acid different — a distinct ingredient) |
| Identity for labelling | INCI Copper Tripeptide-1, CAS 49557-75-7 | A distinct peptide — take the exact INCI from the specification for the material you are buying; it should not be labelled as Copper Tripeptide-1 |
| Typical category use | Broad — general skin-appearance formats (serums, ampoules, creams) | More specialised — scalp and hair-appearance formats (tonics, scalp serums) |
| Appearance & solubility | Water-soluble blue to blue-green powder | Water-soluble blue to blue-green powder |
| Typical cosmetic use level | Broadly ~0.2%–2% depending on format. Note that high headline percentages on finished products usually refer to a stock solution or dispersion rather than pure peptide. | |
| pH window | Near-neutral (~5.0–6.5) to maintain the copper-peptide chelate | |
| Processing | Cold or controlled-temperature blending; avoid prolonged exposure above ~40°C; protect from light | |
| Compatibility | Pairs cleanly with niacinamide, hyaluronic acid and panthenol at near-neutral pH. Caution with strong oxidisers and low-pH, high-concentration L-ascorbic acid. | |
| Colour behaviour | Both tint a formula blue to blue-green. Colour is an integrity indicator (loss of colour signals degradation), not a measure of concentration. | |
| Documentation | COA, specification, HPLC identity/assay, copper-chelation ratio, appearance, heavy metals, microbiology, stability — plus third-party laboratory test reports | |
Choose GHK-Cu if…
- You are formulating facial or body skin-appearance products and want the broadly characterised, widely recognised copper peptide.
- You need a clearly established labelling identity (Copper Tripeptide-1, CAS 49557-75-7) for your regulatory file.
- You want the copper peptide with the widest base of formulation precedent across cosmetic formats.
Choose AHK-Cu if…
- You are building scalp or hair-appearance formats such as tonics and scalp serums.
- You want a more specialised copper peptide to differentiate a hair-category SKU.
- You are designing a dual copper-peptide system and want a second, distinct peptide alongside GHK-Cu.
Using both together
Dual copper-peptide systems are common in scalp and hair-appearance products, typically pairing a higher-level GHK-Cu with a lower-level AHK-Cu. Because both are copper-chelated peptides, they share handling requirements — near-neutral pH, controlled temperature, light protection — which makes them straightforward to co-formulate. What must be validated case by case is the combined system: total copper load, total use level, preservative compatibility and stability through your process and shelf life.
Formulation & handling notes
Both materials are intensely coloured actives, so plan colour into your bench work early: a white emulsion will shift far more visibly than a clear serum, and how the tint reads depends on your packaging. Build a colour-matching and staining check into early bench trials — light-coloured textiles and porous surfaces are the sensible things to test — because it is much cheaper to solve at bench stage than after a pilot batch. Store raw materials cool, dry, sealed and protected from light, and prefer amber glass or opaque airless packaging for finished formats.
For the working sequence rather than the parameters alone — order of addition, when in the batch to adjust pH, the routes around the low-pH ascorbic acid conflict, packaging choice and what a bench trial should cover — see the copper peptide formulation process guide.
Documentation & how to verify
For either peptide, ask for the full document set before you sample: a COA naming the assay method and the batch, a specification sheet, HPLC identity and assay, copper-chelation ratio, appearance, heavy metals, microbiology and stability data. We also supply third-party laboratory test reports, so your QA team is not relying on supplier-generated data alone, and we support buyers who want to commission their own independent testing. See our quality & certifications for how we document and verify ingredients, and browse our ingredient selection guides for related comparisons.
Request a sample, COA or specification → Contact our team with your material, grade, target format and planned volume, and we will send the applicable documentation.
For the material-specific version of this checklist — what a copper peptide certificate of analysis should state, what an HPLC assay does and does not tell you, and how many lots to review before scaling — see how to qualify a copper peptide supplier.
Frequently asked questions
What is the difference between GHK-Cu and AHK-Cu?
They are two different copper peptides, not two grades of the same ingredient. GHK-Cu is built on glycine-histidine-lysine chelated to copper; AHK-Cu is built on alanine-histidine-lysine chelated to copper. That single amino-acid difference makes them distinct materials with different formulation histories, so they should be specified, documented and labelled separately.
Which copper peptide should I use for scalp and hair formats?
As a starting frame, GHK-Cu is the broader, more widely used copper peptide across general skin-appearance formats, while AHK-Cu is the more specialised peptide most often formulated into scalp and hair-appearance products. Neither is stronger in the abstract. Decide on category fit, format, use level and the documentation your regulatory team needs.
Can GHK-Cu and AHK-Cu be used in the same formula?
Yes. Dual copper-peptide systems are common in scalp and hair-appearance products. Because both are copper-chelated peptides they share similar handling requirements, which makes them straightforward to co-formulate. Confirm the combined copper load, total use level and stability in your specific base, and validate with your own testing.
Does a deeper blue colour mean a higher copper peptide concentration?
No. The blue colour comes from the copper-peptide chelate, which is a strong chromophore and reads as intense blue even at low concentrations. Perceived depth of colour is affected by the optical path length you view through, packaging, background and any other coloured ingredients, so it is not a measure of content. Colour is useful in the opposite direction: loss of colour signals degradation. For actual content, rely on the declared specification, the HPLC assay on that batch COA and independent third-party testing.
Request documentation for evaluation
Samples, a COA and a specification can be requested for evaluation before any commercial commitment. Tell us the material, grade, target format and the volume you are planning, and we will come back with the applicable documentation, MOQ, lead time and pricing for that specific case — these vary by material and grade, so a quoted figure is only meaningful against a real brief.
Nutrition BioTech
1601 W. Mission Blvd, Suite 103 (DL#29), Pomona, CA 91766
Phone: (909) 745-1357
Email: [email protected]
Contact us to request a sample, COA or specification