Overview
Palmitoyl AHK is the fatty-acid-conjugated form of the AHK tripeptide (Ala-His-Lys), applying to AHK the same delivery strategy that palmitoyl tripeptide-1 applies to GHK.
The rationale is straightforward and is the strongest thing that can be said for it: free AHK is hydrophilic and penetrates the stratum corneum poorly, and attaching a C16 palmitic acid chain increases lipophilicity so the conjugate partitions into the skin barrier. The underlying peptide has genuine ex vivo human hair follicle evidence behind it as the copper complex AHK-Cu, where it elongated cultured follicles and increased dermal papilla cell proliferation.
Identity caveat: no PubChem record could be matched to palmitoyl AHK under that name in this session, so unlike palmitoyl tripeptide-1 and palmitoyl tripeptide-5 — both of which have confirmed CAS numbers and formulas — the exact chemical identity of material sold under this name cannot be checked against a public registry. Buyers cannot verify what they are receiving, and INCI naming in this corner of the market is inconsistent.
The limiting factor for every topical peptide is delivery. Peptides are hydrophilic and relatively large, while the stratum corneum is a lipophilic barrier built to exclude exactly such molecules. A peptide that performs well in a fibroblast culture has not thereby been shown to reach fibroblasts through intact skin. Reviews of cosmeceutical peptides identify this permeability gap — not receptor pharmacology — as the principal open problem, and note that formulation strategies such as oil-in-water and water-in-oil-in-water emulsions are used to try to close it with uncertain success.
What the evidence shows
Separated by study type- HumanClinical trials and human studies
- No controlled clinical trial isolating this ingredient was located. The parent AHK motif has ex vivo human hair follicle data as AHK-Cu.
- AnimalRodent and other animal models
- Not the primary evidence base.
- In vitroCell and tissue studies
- Evidence attaches to the parent AHK-Cu complex — dermal papilla cell proliferation and hair follicle elongation — rather than to the palmitoylated conjugate specifically.
Key studies & findings
2 studies- 1
The parent motif as AHK-Cu (10⁻¹²–10⁻⁹ M) stimulated human hair follicle elongation ex vivo and dermal papilla cell proliferation in vitro.
- 2
No PubChem record was retrievable for palmitoyl AHK under that name in this session, in contrast to palmitoyl tripeptide-1 and tripeptide-5, which both returned confirmed formulas and CAS numbers.
Benefits & effects
1 documentedImproved skin partitioning relative to unmodified AHK
Side effects & safety
Safety noteCosmetic ingredient used topically in finished formulations. Injecting cosmetic peptides is not an established route, has no supporting safety data, and is not a use these ingredients were characterised for.
Recorded in the cited literature No confirmed chemical registry identity located · No ingredient-isolated clinical safety data located.
No specific adverse events have been compiled for this entry. Absence of data is not evidence of safety.
Limitations & open questions
No confirmed chemical registry entry was located under this name, so material identity cannot be verified against a public reference — a meaningful difference from the other palmitoylated peptides catalogued here. All biological evidence belongs to the parent AHK-Cu complex rather than to this conjugate, and no controlled clinical trial isolating this ingredient was located.
Pharmacology
Palmitoyl AHK is the N-palmitoylated form of Ala-His-Lys. No PubChem entry was retrievable under this name in this session, so molecular formula, weight and CAS number are not stated here rather than guessed.
Frequently asked questions
How does palmitoyl AHK differ from plain AHK?
A 16-carbon palmitic acid chain is attached to make it lipophilic enough to partition into skin. The peptide portion is the same Ala-His-Lys.
Does it have its own research?
Not that was located. The hair follicle and dermal papilla evidence belongs to the copper complex AHK-Cu. The palmitoylated form is a delivery variant.
Why is the identity caveat important here?
Palmitoyl tripeptide-1 and palmitoyl tripeptide-5 both have confirmed CAS numbers and PubChem entries you can check material against. Palmitoyl AHK did not return one, so there is no public reference to verify a purchase against.
Citations
2 sources- 1
- 2