INCI: Heptapeptide-15 - Also known as: Rigin, Palmitoyl Tetrapeptide-7 Variant, Immunomodulating Peptide

QUICK FACTS

What is Heptapeptide-15?

Heptapeptide-15 is a synthetic seven-amino-acid signal peptide that is notably non-palmitoylated — unlike most of the other industry peptides in the Sweet Chemistry complex (Palmitoyl Hexapeptide-52, Palmitoyl Tetrapeptide-50, Palmitoyl Heptapeptide-18, and Palmitoyl Pentapeptide-4), Heptapeptide-15 is an unmodified water-soluble peptide without a fatty acid chain. This means it relies on its inherent water-solubility and molecular weight for skin interaction rather than lipid-phase penetration — placing its activity at the epidermal level and through endocytic uptake rather than lipid-mediated membrane transport.

Heptapeptide-15 (also known in the industry under the trade name Rigin) has a well-documented research profile in the anti-inflammaging peptide category. Its studied mechanism is associated with the interleukin-1 (IL-1) signaling pathway — specifically, its studied association with IL-1 receptor-related activity. IL-1 is a pro-inflammatory cytokine whose chronic low-level elevation is associated with the gradual ECM degradation and collagen loss referred to as inflammaging. Peptides studied in connection with modulating IL-1-related pathways are researched as potential contributors to interrupting this chronic inflammatory signaling cycle.

At Sweet Chemistry, Heptapeptide-15 is the third peptide listed in the industry complex — following Palmitoyl Hexapeptide-52 and Palmitoyl Tetrapeptide-50, and before Palmitoyl Heptapeptide-18 and Palmitoyl Pentapeptide-4. Its non-palmitoylated status makes it the only unmodified peptide in the five-peptide group, ensuring that the complex addresses the skin's structural renewal environment through both lipid-penetrating and water-phase peptide approaches.

What does it do for skin?

Heptapeptide-15 is studied in connection with IL-1-associated inflammatory mediator pathways and their relationship to visible skin aging. Research on this peptide class has explored its association with reducing the chronic, low-grade surface inflammation that is studied as a contributor to progressive ECM degradation and the gradual loss of skin density associated with the aging appearance. In this context, Heptapeptide-15 addresses a root-level studied contributor to aging appearance rather than simply compensating for visible outcomes.

Published research on Heptapeptide-15 has associated it with improvements in the appearance of skin density, firmness, and the reduction of fine lines over consistent use — results attributed to its studied association with the IL-1 inflammatory pathway and its relationship to collagen and elastin preservation. These are research-based associations and individual results will vary.

Within the five-peptide complex, Heptapeptide-15's anti-inflammaging signaling complements the structural signaling of Palmitoyl Hexapeptide-52 (elastin), Palmitoyl Tetrapeptide-50 (basement membrane collagen IV), Palmitoyl Heptapeptide-18 (neuro-cosmetic expression lines), and Palmitoyl Pentapeptide-4 (collagen I/III) — together creating a five-directional peptide approach that no single sequence could replicate.

FOUND IN

In 3 Formulas as Part of the 5% Industry Peptide Complex

Heptapeptide-15 is the third listed of the five industry peptides in all three Sweet Chemistry water-based formulas — always appearing between Palmitoyl Tetrapeptide-50 and Palmitoyl Heptapeptide-18.

Nourishment - All Skin Types

Barrier Repairing Hydra-Serum 5% Industry Peptide Complex (incl. Heptapeptide-15) - 1.0 oz / 30 ml

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream 5% Industry Peptide Complex (incl. Heptapeptide-15) - 1.7 oz / 50 ml

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream 5% Industry Peptide Complex (incl. Heptapeptide-15) - 1.7 oz / 50 ml

WORKS TOGETHER WITH

Collagen IV Signal Peptide Palmitoyl Tetrapeptide-50

INCI: Palmitoyl Tetrapeptide-50.

The peptide immediately preceding Heptapeptide-15 in the industry complex. Synergy Note: Palmitoyl Tetrapeptide-50 also targets anti-inflammaging pathways from the collagen IV and basement membrane direction; Heptapeptide-15 addresses the IL-1 cytokine pathway dimension. Together they approach the anti-inflammaging goal from both structural basement membrane and cytokine signaling angles.

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

At 3% in all four formulas. Synergy Note: Matrikynes® addresses ECM structural renewal through matrikine signaling; Heptapeptide-15 addresses the inflammatory mediator environment that contributes to ECM degradation. Protect and renew — the peptide and the anti-inflammaging approach working in the same formula.

Soothing System Bisabolol + Panthenol + Allantoin + Colloidal Oatmeal + Biosaccharide Gum-1

Five soothing actives in all three water-based formulas. Synergy Note: The soothing system addresses surface inflammatory comfort; Heptapeptide-15 is studied in connection with the deeper cytokine-level inflammatory mediator environment. Together they approach the inflammatory component of visible aging from the surface sensation and the cellular mediator dimensions simultaneously.