Signal, Carrier and Enzyme-Inhibitor Peptides: The Skin Peptide Classes Explained

Not every peptide does the same job. Skin science groups them into classes based on how they act. This guide explains the main ones and where the research peptides you hear about fit.

Signal peptides

Signal peptides tell cells to do something, such as making more collagen. Collagen fragments and some synthetic peptides work this way in cell studies.

Carrier peptides

Carrier peptides deliver trace elements that enzymes need. The classic example is GHK-Cu: it carries copper, which is required by enzymes that help build and cross-link collagen and elastin.

Enzyme-inhibitor peptides

These slow the breakdown of structural proteins by blocking enzymes such as matrix metalloproteinases (MMPs). The idea is to preserve existing collagen.

Neurotransmitter-modulating peptides

These are cosmetic peptides that interfere with muscle-contraction signals to soften expression lines. They are not related to acne.

Hormone-fragment peptides

Fragments of natural hormones, such as KPV from alpha-MSH, keep part of a hormone’s activity. They are studied for inflammation and receptor signaling. Related melanocortin compounds such as Melanotan-1 are used as research tools for the melanocortin system.

Repair and growth-factor-like peptides

Peptides such as BPC-157 and TB-500 are studied in tissue-repair models for effects on blood vessels and cell movement.

Why classes matter

• Different classes act on different steps of skin biology
• Combining classes is the logic behind blends
• A peptide’s class explains what a study can and cannot test

Browse the research compounds

Explore GHK-Cu, KPV and BPC-157. Every compound is sold for laboratory research use only, and batch-specific lab reports are on the COA page. You can also browse the full shop.

Related reading: The most-studied peptides for acne research and peptides for acne scar research.

This article is educational and summarizes published laboratory research. It is not medical advice. Compounds mentioned are sold for research use only, not for human or veterinary use.

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For laboratory research use only. Not for human or veterinary use, and not intended to diagnose, treat, cure or prevent any condition. This article is educational and is not medical advice.