Capixyl
A patented hair-complex ingredient pairing a biotin peptide with a tetrapeptide—common in scalp serums marketed for thinning hair.
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✨ real molecule sketch
Spotted this on a label?
Biotinoyl Tripeptide-1
That’s the INCI name—the official way it appears on the back of your serum or cream. Same ingredient, different marketing names.
Structure (cute edition)
✨ real molecule sketch
This peptide is a short chain of about 3 amino acids—think of it as a tiny protein necklace on your label.
INCI: Biotinoyl Tripeptide-1 · ~3 amino acids in our simplified view
What brands say it does
Capixyl combines Biotinoyl Tripeptide-1 (sometimes listed separately) with Acetyl Tetrapeptide-3 in a glycol base. Brands position it to support the appearance of denser, healthier-looking hair at the follicle level. It is a cosmetic active, not a drug—results are gradual and vary by person.
Where you’ll find it
Scalp serums, hair-density drops, and fortifying treatments from brands like Nécessaire and drugstore peptide hair lines.
Other names you might see
Biotinoyl Tripeptide-1
Acetyl Tetrapeptide-3
Butylene Glycol complex
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Educational only—not medical advice. Hair loss has many causes; see a dermatologist or trichologist for persistent thinning.