---
title: "What Is Myristoyl Pentapeptide-17 in Lash Serum?"
slug: "myristoyl-pentapeptide-17"
date: "2026-07-11"
author: "The Lash List Editorial Team"
description: "Learn what myristoyl pentapeptide-17 is, which formulas list it, what human studies can and cannot prove, and where safety evidence remains incomplete."
canonical: "https://thelashlist.com/ingredients/myristoyl-pentapeptide-17/"
robots: noindex, follow
status: review-draft
reviewer_status: "Not medically reviewed; qualified review required before indexation"
---

# What Is Myristoyl Pentapeptide-17 in Lash Serum?

**Plain answer:** Myristoyl Pentapeptide-17 is a small lab-made peptide in some lash serums. Brands say it may help lashes look fuller. Human studies have tested blends that include it. Those blends had many other ingredients too. The studies cannot show what this one peptide did. Direct human proof for lash growth is still limited.

This page is a source-checked editorial draft. It is not medically reviewed and remains noindex until the correct qualified reviewer approves the exact page version.

## Evidence approach

Effectiveness is graded separately from safety. A finished-formula study does not prove that one ingredient caused the result. A regulator or safety-panel conclusion is limited to the exact ingredient, use, concentration, and jurisdiction it names.

**Effectiveness grade key:** A = strong controlled human evidence for the exact use. B = one controlled human study. C = a small uncontrolled human formula study. D = laboratory, animal, scalp-hair, or supplier evidence. E = label presence, theory, or no direct human eyelash evidence. Grades do not rate safety.

## Source register

- https://pubmed.ncbi.nlm.nih.gov/38475901/
- https://www2.mst.dk/Udgiv/publications/2025/05/978-87-7038-999-0a.pdf
- https://pmc.ncbi.nlm.nih.gov/articles/PMC7158911/
- https://pmc.ncbi.nlm.nih.gov/articles/PMC11523977/
- https://single-market-economy.ec.europa.eu/sectors/cosmetics/cosmetic-ingredient-database_en
- https://theordinary.com/en-ws/multi-peptide-lash-brow-serum-100111.html
- https://grandecosmetics.com/products/grandelash-sensitive

Sources checked: 2026-07-11.

## Current product label examples

- [SOWN Root 1 review](https://thelashlist.com/reviews/sown-beauty-review/)
- [The Ordinary Multi-Peptide Lash and Brow Serum review](https://thelashlist.com/reviews/the-ordinary-lash-serum-review/)

Both current official U.S. ingredient lists name Myristoyl Pentapeptide-17. A label match proves presence only. It does not show the amount or prove that this one peptide caused a finished-formula result. Formulas can change.

## Related ingredient pages

- [Peptides in Lash Serums](https://thelashlist.com/ingredients/peptides/)
- [Prostaglandin Analogues](https://thelashlist.com/ingredients/prostaglandin-analogues/)
- [Isopropyl Cloprostenate](https://thelashlist.com/ingredients/isopropyl-cloprostenate/)
- [Bimatoprost](https://thelashlist.com/ingredients/bimatoprost/)

- [Lash serum ingredient hub](https://thelashlist.com/ingredients/)
- [Ingredient Checker](https://thelashlist.com/tools/ingredient-checker/)
- [Lash serum ingredients to avoid](https://thelashlist.com/guides/lash-serum-ingredients-to-avoid/)