Skin & aging Signal peptide
Palmitoyl hexapeptide-12
Regulatory status
Status at a glance
503A compounding status
Not nominated
We found no pending nomination for the 503A bulks list. Unless the substance has another legal pathway (for example, a USP monograph or use in an FDA-approved drug), 503A pharmacies generally may not compound with it.
- FDA approval
- Not FDA-approved for any use
- 503B outsourcing
- Not determined
- Anti-doping (WADA)
- Not on the WADA Prohibited List
- DEA schedule
- Not a controlled substance
About peptide status
Most peptides discussed here are not FDA-approved for any use, and products labeled “research use only” are not for human use. Removal from Category 2 does not authorize compounding. PCAC votes are non-binding recommendations; FDA and HHS make the final decisions.
This is not medical or legal advice, and we do not publish dosing, sourcing or reconstitution information. Talk with a licensed clinician before using any peptide.
If you think you are having a medical emergency, call 911.
Key takeaway
Palmitoyl hexapeptide-12 is a fat-attached "signal" peptide based on a fragment of elastin, the protein that gives skin its stretch, sold as Biopeptide CL. Laboratory work suggests it signals skin cells to make more structural proteins and can help reinforce the skin barrier, which is the basis for its use in products aimed at the appearance of firm, supple skin. As of 2026, the human data are limited to mechanistic and safety studies, with no independent trial showing an appearance benefit.
At a glance
- What it is
- Cosmetic ingredient, an elastin-inspired signal peptide (sold as Biopeptide CL)
- FDA status
- Does not require FDA approval, as a cosmetic ingredient rather than a drug
- Research
- Activity rests on laboratory and manufacturer data; no independent human efficacy trial exists
- Used in
- "Anti-aging" and barrier-support products for the look of firmness and smoothness
- Evidence strength
- Low research
Summary
Palmitoyl hexapeptide-12 is an elastin-fragment peptide used in skincare. Learn how it works, what research exists, and why it is a cosmetic ingredient.
What is palmitoyl hexapeptide-12?
Palmitoyl hexapeptide-12 is a peptide of six amino acids joined to palmitic acid to help it penetrate the skin. Its peptide core is a fragment sequence derived from elastin, the protein that lets skin stretch and recoil, which places it among the signal peptides that aim to influence the skin's support structure. It is made by Sederma (Croda Beauty Actives) under the name Biopeptide EL and is a cosmetic ingredient, not a drug. On some labels it can be cross-listed with "palmitoyl oligopeptide," so naming is occasionally ambiguous.
How does it work?
Laboratory studies describe palmitoyl hexapeptide-12 as an elastin-derived matrikine, a fragment that signals skin cells. In cell models it is reported to prompt fibroblasts to make more elastin, glycosaminoglycans, and collagen, and to lower an inflammatory messenger, interleukin-6. More recent laboratory work on human skin samples also shows the peptide can self-assemble, penetrate the outer layers, and help reinforce a weakened skin barrier.
One nuance belongs in an honest description: Elastin-derived fragments have a mixed biology, and at some levels they can actually promote inflammation, so a benefit should not be assumed from the mechanism alone. In finished cosmetics, the goal is described in appearance terms for the look of firmer, smoother, more resilient skin.
Is it FDA-approved?
Safety note
Status: Does not require FDA approval, as a cosmetic ingredient rather than a drug
Category: Cosmetic and topical · Primary body area: Skin & aging
No, and it does not need to be. The FDA does not pre-approve cosmetic ingredients. A cosmetic may describe effects on the look and feel of skin, while a claim to rebuild the body's elastin would make a product a drug. Palmitoyl hexapeptide-12 is used as a cosmetic ingredient, for the appearance of the skin.
What is it used for?
Palmitoyl hexapeptide-12 is used in "anti-aging" and barrier-support serums and moisturizers. The appearance goals are the look of firmness and elasticity, smoother texture, and a reduction in the appearance of fine lines.
What does the research show?
Editor’s note
Evidence strength: Low research (1 human · 0 animal/cell studies)
Human data are limited to mechanistic and safety studies, with no independent trial showing an appearance benefit, and the underlying elastin-fragment biology is mixed.
The human evidence is limited to mechanism and safety rather than appearance outcomes. According to PubMed, two studies address it:
| Study | Evidence type | Finding |
|---|---|---|
| Ex-vivo human skin study | Mechanism | The peptide penetrates skin and can help repair a stripped barrier |
| Cosmetic-peptide safety analysis | Safety | No toxicity or allergy flags for it |
Neither is an efficacy trial. No independent human study measuring wrinkle or firmness outcomes was found, so efficacy claims rest on manufacturer and laboratory data.
What are the side effects?
Palmitoyl hexapeptide-12 is considered low-irritation and safe at cosmetic use levels, and bioinformatic screening found no allergen or toxin flags. Independent clinical safety data are limited, so a patch test is reasonable for sensitive skin.
Sources: an ex-vivo human skin study of penetration and barrier repair (Ligorio et al., ACS Applied Bio Materials, 2025, DOI: 10.1021/acsabm.4c01816); and a cosmetic-peptide safety analysis (Bjerke et al., Current Research in Toxicology, 2026, DOI: 10.1016/j.crtox.2026.100291), both indexed on PubMed. This document is educational and does not constitute medical advice.
Registered human trials
1 registered human trial on ClinicalTrials.gov that we reviewed
Sources
- [1]
- [2]
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