AHK-Cu (Alanine-Histidine-Lysine Copper) vs SNAP-8 (Acetyl Octapeptide-3)
A neutral, side-by-side comparison of two anti-aging & longevity peptides — their mechanisms, dosing ranges, administration routes, side effects, and research evidence. For research and educational purposes only.
AHK-Cu (Alanine-Histidine-Lysine Copper)
Copper-chelating tripeptide structurally related to GHK-Cu but optimized for scalp and hair follicle applications. AHK-Cu activates hair follicle stem cells and prolongs the anagen (active growth) phase, making it a key research compound for androgenetic alopecia and diffuse hair loss. Used topically as an alternative or complement to minoxidil and finasteride.
Full profileSNAP-8 (Acetyl Octapeptide-3)
8-amino acid cosmetic peptide active (Acetyl Octapeptide-3) that competes with SNARE complex proteins to reduce neuromuscular signal transmission in facial expression muscles. An extended, more potent version of Argireline (Acetyl Hexapeptide-3). Clinical studies show 26–63% reduction in expression wrinkle depth with twice-daily application, positioning it as a topical botulinum toxin alternative.
Full profile| AHK-Cu (Alanine-Histidine-Lysine Copper) | SNAP-8 (Acetyl Octapeptide-3) | |
|---|---|---|
| Category | Anti-Aging & Longevity | Anti-Aging & Longevity |
| Also known as | AHK copper peptide, Ala-His-Lys copper, hair growth copper peptide, AHK-copper complex | Leuphasyl, Acetyl Octapeptide-3, SNAP-8 peptide, Argireline extension, Acetyl Glutamyl Heptapeptide-3 |
| Evidence | Research-stage | Research-stage |
| Dosing range | 0.1%–1% %, Daily topical application (scalp) | 1%–10% %, twice daily topical application |
| Administration | Topical (scalp serum/solution), Subcutaneous (microneedling-assisted delivery) | Topical (serum/cream) |
| Key side effects | Mild scalp irritation, Contact dermatitis (rare), Temporary scalp redness or tingling, Transient scalp shedding at initiation (shedding phase) | Very well-tolerated, Rare mild skin irritation or redness, No systemic absorption at cosmetic concentrations, No paralysis risk (partial SNARE competition only) |
| Cited sources | 2 references | 2 references |
Key differences
- Administration: AHK-Cu (Alanine-Histidine-Lysine Copper) — Topical (scalp serum/solution), Subcutaneous (microneedling-assisted delivery); SNAP-8 (Acetyl Octapeptide-3) — Topical (serum/cream).
- Frequency: AHK-Cu (Alanine-Histidine-Lysine Copper) is typically Daily topical application (scalp); SNAP-8 (Acetyl Octapeptide-3) is twice daily topical application.
How each works
AHK-Cu (Alanine-Histidine-Lysine Copper)
AHK-Cu activates β-catenin/Wnt signaling in dermal papilla cells and promotes VEGF expression around hair follicles. Studies demonstrate extended anagen phase duration, increased follicle size, and upregulation of hair growth factors in treated scalp tissue. The copper component supports tyrosinase activity for follicle pigmentation and metalloenzymes involved in extracellular matrix remodeling around follicles.
SNAP-8 (Acetyl Octapeptide-3)
SNAP-8 mimics the N-terminal domain of SNAP-25, competing for SNARE complex assembly required for acetylcholine vesicle fusion at the neuromuscular junction. This partial inhibition reduces muscle contraction intensity without complete paralysis. Clinical studies demonstrate statistically significant reductions in crow's feet and forehead line depth after 28 days of use at 5–10% concentration.
This comparison aggregates public research and structured profile data for informational purposes only. It is not medical advice and does not recommend either compound for human use. Consult a qualified healthcare provider before considering any peptide.