If you're formulating anti-aging skincare or a scalp-care serum, choosing the right cosmetic peptide is the difference between a product that performs and one that just sounds good on the label. Below is a straightforward comparison of three of the most widely used cosmetic peptides and when each makes sense in a formulation. All three are raw cosmetic actives for professional formulation use.
1. Acetyl Octapeptide-3 (Snap-8) — for the look of expression lines
Used for: formulations targeting the appearance of forehead lines, crow's feet, and other expression lines.
Snap-8 is an octapeptide popular in leave-on serums and creams aimed at smoothing the look of the skin and softening the appearance of expression lines. If your formulation targets the visible signs of movement-related lines, this is a classic starting point. View Acetyl Octapeptide-3 (Snap-8).
2. Acetyl Hexapeptide-38 — for the appearance of volume and firmness
Used for: formulations aimed at the appearance of facial volume, contour, and firmness.
Acetyl Hexapeptide-38 (also known as Adifyline) is a newer-generation lipopeptide used in products designed to improve the look of skin volume and firmness. It's a strong choice for a topical plumping or volumizing cosmetic effect, and it pairs well with signal peptides in a layered anti-aging formula. View Acetyl Hexapeptide-38.
3. AHK-Cu Copper Peptide — for hair and scalp cosmetics
Used for: scalp serums and cosmetic products aimed at the appearance of fuller, thicker-looking hair.
AHK-Cu is a copper tripeptide used in hair- and scalp-focused cosmetic formulations, valued for supporting the appearance of denser-looking hair and a well-conditioned scalp. If you're building a scalp or hair cosmetic product, this is a common choice. View AHK-Cu Copper Peptide.
Quick comparison
| Peptide | Typical use in formulation | Type |
|---|---|---|
| Acetyl Octapeptide-3 (Snap-8) | Appearance of expression lines | Octapeptide |
| Acetyl Hexapeptide-38 | Appearance of volume & firmness | Lipopeptide |
| AHK-Cu Copper Peptide | Hair & scalp cosmetics | Copper tripeptide |
Whichever you choose, verify the raw material
The peptide type matters, but so does the quality of the powder itself. Look for HPLC-verified purity at 99%+, a batch-specific Certificate of Analysis, GMP/ISO-certified manufacturing, and UV-protected packaging. Read more in our guide on what cosmetic peptides are and how to store them correctly.
All three peptides above are available from cusk20 in sizes from 20–50 g up to 1000 g, each HPLC-verified and shipped with COA available on request. Browse the full catalog.
All products sold by cusk20 are raw cosmetic active ingredients intended for professional formulation use only. They are not finished cosmetic products, are not drugs, and are not intended to diagnose, treat, cure, or prevent any disease.