After your skincare, apply LashExtend along the very base of your lashes, directly on the eyelid skin, so the serum can flow between the lashes. Use it morning and evening until you love the result. Then use it two to three times a week to maintain long, luscious-looking lashes. Follow with ShadowSense® or your eye color. LashExtend.

What does SeneGence LashExtend do for lashes?

Quick answer

SeneGence LashExtend is a lightweight lash-line serum built around the peptide Myristoyl Pentapeptide-17. LashExtend helps lashes appear up to 25% longer, healthier, stronger and fuller over time. Conditioning peptides, humectants and antioxidant botanicals support a more resilient-looking lash line. Beauty Book 2026 (p. 20).

By SeneGence · Alan Kante, publisher · Updated October 30, 2026

A small clear lash-treatment tube with a gold cap, LashExtend. — LashExtend helps lashes appear up to 25% longer, healthier, stronger and fuller over time.

What does it do for my lashes?

LashExtend supports keratin for stronger-looking lashes, nourishes the lash base and helps promote growth while helping prevent lash loss. The formula is built for the lash line. LashExtend pairs Myristoyl Pentapeptide-17 with a lightweight formula made for the lash line. The peptide has also been studied on its own for the look of lash density. See the LashExtend formula and the Myristoyl Pentapeptide-17 study.

How LashExtend helps lashes look longer and fuller — Apply LashExtend at the base of the lashes for longer-, fuller-looking lashes over time. LashExtend helps lashes appear up to 25% longer, healthier, stronger and fuller over time with Myristoyl Pentapeptide-17, white tea and chamomile, applied at the lash base morning and evening. LashExtend helps lashes appear up to 25% longer, healthier, stronger and fuller over time. Conditioning peptides, humectants and antioxidant botanicals support a more resilient-looking lash line.

How do I apply it?

After your skincare, apply LashExtend along the very base of your lashes, directly on the eyelid skin, so the serum can flow between the lashes.
Use it morning and evening until you love the result.
Then use it two to three times a week to maintain long, luscious-looking lashes.
Follow with ShadowSense® or your eye color.

LashExtend.

What else is inside?

Peptide care supports keratin for stronger-looking lashes. Chamomile extract soothes and conditions; white tea extract adds antioxidant care. Glycerin maintains moisture and Butylene Glycol helps hydrate and support ingredient delivery. On the label, the botanicals are Chamomilla Recutita (Matricaria) Extract and Camellia Sinensis (White Tea) Extract. See every lash peptide by goal.

Where does LashExtend go in my eye routine?

LashExtend goes on after skincare and before eye color; UnderSense 3-in-1 Maximizing Lash Primer and mascara finish the lash look. See the full eye-product order.

Benefits, formula & use

LashExtend

Benefits: Choose LashExtend, our lash lengthener, at the base of the lashes for long, luscious-looking lashes.
Application: Apply LashExtend to the very base of lashes so that the solution may flow down into and between the shafts of the eye lash. Use LashExtend in the AM and PM till desired result has been achieved. Continue to use two to three times per week to maintain long luscious lashes. LashExtend should be applied directly onto skin of eyelid along the base of the eyelash after SeneGence SkinCare application and before application of ShadowSense.
Good For: LashExtend suits all types.

SeneGence Beauty Book 2026, p. 20 · Current formula and directions: official SeneGence product page · View LashExtend on SeneGence

LashExtend

Choose LashExtend, our lash lengthener, at the base of the lashes for long, luscious-looking lashes.

SenePeptide®

LashExtend suits all types.

How to use LashExtend

Apply LashExtend to the very base of lashes so that the solution may flow down into and between the shafts of the eye lash. Use LashExtend in the AM and PM till desired result has been achieved. Continue to use two to three times per week to maintain long luscious lashes. LashExtend should be applied directly onto skin of eyelid along the base of the eyelash after SeneGence SkinCare application and before application of ShadowSense.

Read the ingredients

Water/Aqua/Eau Glycerin Myristoyl Pentapeptide-17 Polyester-5 Acrylates Copolymer Butylene Glycol Camellia Sinensis (White Tea) Extract Chamomilla Recutita (Matricaria) Extract Hydroxyethylcellulose Sodium Chloride Sodium Phosphate Disodium Phosphate Disodium EDTA Quaternium-15 Iron Oxides Ultramarines.

How to choose & use Official product page Formula and sources

Study results at a glance

Myristoyl Pentapeptide-17 — lash-density and keratin-gene studies3 results

Myristoyl Pentapeptide-17 — lash-density and keratin-gene studies
Result	Kind of result	When it was measured
For Myristoyl Pentapeptide-17, the ingredient’s maker reports induction of hair-specific keratin genes after 48 hours in an in vitro human keratinocyte assay using 0.001% neat material.	Ingredient study	48 hours
For Myristoyl Pentapeptide-17, the ingredient maker’s conclusion slide reports increasing lash density through day 42, with values of 33.67% at day 14, 46.71% at day 28, and 60.60% at day 42 in a four-person uncontrolled lash-root study testing 5% and 10% supplier-material eyeliner serums once nightly; allocation between strengths and whether or how the conclusion series combines them are not disclosed.	Measured result	day 14; day 28; day 42
For Myristoyl Pentapeptide-17, the ingredient’s maker labels a single right-eyelash image series for its 10% supplier-material eyeliner-serum example with increases of 46.26% at day 14, 66.3% at day 28, and 72.29% at day 42.	Measured result	day 14; day 28; day 42

Who took part: Human study: four people across 5% and 10% supplier-material conditions; the conclusion slide does not assign its result series to either strength. A separate 10% image sequence is labeled as one example.
How it was evaluated: In vitro human keratinocyte gene-expression assay; uncontrolled four-person lash-root image study; and one separately labeled 10% example image series
Statistical context: The ingredient’s maker reports increasing lash density through day 42 in its four-person study and provides one separately labeled 10% example image series.

See the full finding: Myristoyl Pentapeptide-17 — lash-density and keratin-gene studies · Open the source document (PDF)