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The Lash Serum Make-Up Artists Swear By
Our nightly conditioning serum — trusted by women across the U.S. to support the appearance of longer, stronger, darker-looking lashes (and brows).
$116.25 $155
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60-Day Promise
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Derm-Developed
*In 2024. Source Euromonitor International Limited; Custom research conducted June–Aug 2025, retail value RSP terms; all channels; Lash Serum including Lash Serum products sold as part of Sets and Kits.
Real Customers, Real Results
See Lash Boost in action.
In 8 Weeks, You Could Have
90%
saw fuller-looking lashes*
85%
saw longer-looking lashes*
63%
saw darker-looking lashes*
*Based on an 8-week U.S. clinical and consumer study with real participants using Lash Boost nightly. Individual results may vary.
A verified review
I’ve spent thousands on extensions over the past four years. Six weeks in, my own lashes were already filling in the gaps. At three months I started getting compliments from women at the dermatologist’s office.
Real Reviews. Real Results.
Questions, Answered
FAQs
How long until I see results?
In an 8-week U.S. clinical and consumer study, the majority of participants saw visible improvements by the end of week eight. Most customers notice a difference somewhere between weeks four and six, with results continuing to develop through month three with daily use.
How do I apply it?
Once a day, in the evening, along the upper lash line of clean dry skin — like a thin liquid eyeliner. Wait at least 90 seconds for the serum to dry before applying any other product, going to sleep, or washing your face. Do not apply to the lower lash line.
How long does one tube last?
Applied as directed — once nightly along the upper lash line — one 5 ml tube lasts approximately two months.
Can I use it on my brows?
Yes. Apply nightly to clean dry brows. Lash Boost is suitable for tinted lashes and brows and will not affect the color.
Can I use it with eyelash extensions or contact lenses?
Lash Boost was developed for use on natural lashes — we don’t recommend using it with extensions. It has been found safe and non-irritating for contact lens wearers.
What if I have sensitive eyes or skin?
Patch test first. Apply a small amount to a portion of the eyelid margin near the upper lash line of one eye after cleansing. If after 24 hours there’s no redness or irritation, begin with every-other-night application and gradually increase to nightly as tolerated.
Who shouldn’t use Lash Boost?
Do not use if you are pregnant or nursing, undergoing treatment for glaucoma or cancer, or have ever experienced conjunctivitis, dry eyes, eye infections, styes, irritation from other cosmetics applied around the eye area, or any eye-related disorder. Lash Boost contains almond extract and may not be safe for those with nut allergies. Consult your doctor before use.
What’s your money-back guarantee?
We offer a 60-day satisfaction promise on Lash Boost. If you’re not seeing the results you want, contact our team and we’ll make it right.
R+F Lash Boost
$116.25 $155 · 25% off