Myristoyl Pentapeptide-17: The Lash Peptide With the Strongest Data

Of all the peptides used in cosmetic lash serums, one stands out for having the most direct clinical research on eyelash growth specifically. Myristoyl pentapeptide-17 isn't the only peptide that works — but it's the one with the clearest evidence trail. If you're reading lash serum labels and want to know which peptide name to look for first, this is it.

What Is Myristoyl Pentapeptide-17?

Myristoyl pentapeptide-17 is a synthetic peptide engineered specifically for hair growth applications. The name describes its structure: a "pentapeptide" is a chain of five amino acids, and "myristoyl" refers to a fatty acid attached to the peptide that helps it penetrate the skin barrier.

Originally developed for scalp hair products, it was later identified as particularly effective for eyelash growth. It's now used in cosmetic eyelash serums across multiple brands, especially in formulations from Asia and Europe.

How It Works

Myristoyl pentapeptide-17 acts on the dermal papilla — the structure at the base of each hair follicle that controls growth. By stimulating activity in this area, the peptide:

Extends the anagen (growth) phase of the lash cycle, so each lash spends more time actively growing before transitioning to rest.

Increases keratinocyte production, leading to thicker hair shafts that are more resistant to breakage.

Supports keratin gene expression, which translates to stronger lash composition at the cellular level.

Compared to plain biotin or vitamin-based ingredients, the mechanism is targeted and biological rather than nutritional or conditioning.

What the Studies Show

A cosmetic study published in 2010 in the Journal of Cosmetic Dermatology evaluated topical myristoyl pentapeptide-17 applied to eyelashes daily over 12 weeks. Participants saw measurable increases in lash length, thickness, and density compared to a placebo group.

Follow-on research and brand-funded efficacy testing has continued to support these findings. The effect is smaller than what prostaglandin-based serums produce in the same timeframe — but it comes without the documented side effects.

Most users see initial improvement around week 4-6, with peak results at week 8-12. As with any peptide-based serum, consistency matters more than dose.

How It Compares to Other Peptides

Different peptides target different parts of the growth cycle. Myristoyl pentapeptide-17 isn't necessarily "better" than other peptides — it's the one with the most direct eyelash-specific research.

Vs. biotinoyl tripeptide-1: Biotinoyl tripeptide-1 anchors lashes more firmly and extends growth phase. Read more. Myristoyl pentapeptide-17 acts more on the dermal papilla. They're complementary.

Vs. copper tripeptide-1: Copper tripeptide-1 has stronger evidence for follicle stimulation and skin healing. It's often paired with myristoyl pentapeptide-17 in multi-peptide formulas.

Vs. acetyl hexapeptide-8: Acetyl hexapeptide-8 is more often used for muscle relaxation in skincare. Its inclusion in lash serums is typically supporting, not primary.

Vs. plain biotin (Vitamin B7): Not a peptide. Limited evidence for lash growth in non-deficient users. More on biotin's evidence here.

The strongest formulas don't choose one peptide — they combine multiple peptides that hit different mechanisms simultaneously.

How to Find It on a Label

On an INCI ingredient list, look for the exact term "Myristoyl Pentapeptide-17." It's typically written in full.

A few things to check:

Position on the list. Cosmetic ingredients are listed in descending concentration order down to about 1%. Myristoyl pentapeptide-17 at the very end of a 50-ingredient list is at a marketing-level dose. In a functional formula, it should appear in the second half of the list alongside other named peptides — that placement is normal for active peptides because they work at low concentrations.

Other peptides alongside it. A formula with myristoyl pentapeptide-17 plus copper tripeptide-1, biotinoyl tripeptide-1, and acetyl hexapeptide-8 is working at multiple growth-cycle stages simultaneously. Single-peptide formulas underperform multi-peptide stacks.

Growth factors and PDRN. Adding EGF (rh-Oligopeptide-1) or Sodium DNA to a peptide stack addresses the growth cycle from additional angles.

Limitations to Know

No peptide is a miracle ingredient. Myristoyl pentapeptide-17 has clear evidence for moderate lash growth improvement — not transformation.

Slower than prostaglandins. Results take 8-12 weeks vs 4-6 for prostaglandin analogs. The tradeoff is safety.

Genetics still cap potential. The peptide maximizes what your follicles are capable of producing. It doesn't override genetic potential.

Consistency required. Missing daily applications resets progress. Once you stop, results gradually fade over 4-8 weeks as the lash cycle returns to baseline.

Single peptide isn't enough. Even with the strongest evidence base, a serum built around just one peptide underperforms a well-designed multi-peptide formula.

The Bottom Line

Myristoyl pentapeptide-17 is one of the most evidence-backed cosmetic peptides for eyelash growth. It works at the dermal papilla, extends the active growth phase, and supports thicker, stronger lashes. It's not a miracle, but it's a real ingredient with real research.

If a lash serum lists myristoyl pentapeptide-17 — especially alongside other named peptides and growth factors — you're looking at a formula with genuine biological backing rather than marketing.

Frequently Asked Questions

What does myristoyl pentapeptide-17 do for eyelashes?
It acts on the dermal papilla at the base of each lash follicle, extending the active growth phase and stimulating keratinocyte production. The result is longer, thicker, denser lashes over 8-12 weeks of consistent daily use.

How long does myristoyl pentapeptide-17 take to work?
Initial visible improvement typically appears around week 4-6 of consistent daily application. Full results peak at week 8-12. Slower than prostaglandin analogs (which work in 4-6 weeks) but with a much better safety profile.

Is myristoyl pentapeptide-17 safe?
Yes. Side effects are rare and limited to mild local irritation in some sensitive users. The peptide doesn't carry the risks associated with prostaglandin-based serums (iris darkening, eyelid pigmentation, orbital fat changes). It's a cosmetic ingredient, not a drug.

How does myristoyl pentapeptide-17 compare to biotin?
They're different categories. Myristoyl pentapeptide-17 is a peptide with cell-signaling activity at the follicle. Biotin is a vitamin that supports keratin synthesis only when you're deficient. The peptide has stronger evidence for actual lash growth in non-deficient users.

Should I look for myristoyl pentapeptide-17 in a lash serum?
Yes — but don't stop there. The strongest formulas combine myristoyl pentapeptide-17 with other peptides (copper tripeptide-1, biotinoyl tripeptide-1) and growth factors (EGF) to address the lash growth cycle from multiple angles. Single-peptide formulas underperform multi-peptide stacks.