How to Apply a Lash Serum (and the Mistakes That Waste a Tube)

11 September 2026|Lash Originals Editorial Team

Fine-tip LashOriginals applicator making one light stroke along a closed upper lash line.

Once a day, one thin line along the upper lash line, on skin that is clean and completely dry. Then let it dry fully before anything else goes on. Follow the current product directions. How quickly you notice a difference in appearance varies from person to person.

This guide covers the routine for the LashOriginals Lash Serum, a prostaglandin-free conditioning serum, then the questions people ask most: before or after mascara, how often, how long until you notice anything, and which habits empty a tube for nothing. Every instruction comes from the product's own directions and the safety and usage guide.

How to apply a lash serum, step by step

The Lash Serum is a 5 mL, water-based, fragrance-free formula containing peptides, biotin and panthenol. It is vegan and contains no free oils.

Patch test first. Apply a small amount to a discreet patch of skin and wait 24 hours to check for any sensitivity.
Start with a clean, dry lash line. Remove all eye makeup, cleanse, and make sure the area is completely dry. Residual moisture can dilute the formula.
Use clean hands and the applicator provided. Do not share the applicator, and keep it clean between uses.
Dip once. One dip of the applicator is enough for both eyes.
Trace one thin line along the upper lash line. Apply a thin, even layer to the skin at the base of the upper lashes. It goes on the skin, not on the lash hairs, and not on the lower lid. Avoid direct contact with the eye.
Let it dry fully. Wait until the serum has dried before applying makeup, skincare or other products.
Close the cap tightly. Store the tube at room temperature, away from direct sunlight and heat, and out of reach of children.

If any serum gets into the eye, rinse thoroughly with clean, cool water. If irritation occurs, stop using it. If it persists, seek medical advice.

Lash serum before or after mascara and skincare?

Serum first, always. It needs clean, dry skin, so it cannot go on over mascara, eyeliner or eye cream. It can be used before makeup in the morning or after makeup removal at night. Either way, it goes on bare skin.

Morning: cleanse, dry, apply the serum, let it dry, then carry on with skincare and makeup. Wait until it has dried fully before applying eyeliner or mascara.

Evening: remove makeup, cleanse, dry, apply the serum, let it dry, then finish the rest of your skincare. Keep other products off the lash line until the serum has dried.

If you wear contact lenses, do not assume compatibility. Check with an eye-care professional before use, follow their advice, and avoid direct contact with the eye. If you also use the Eyebrow Serum, apply each product only to its intended area and let it dry fully before applying other products.

How often to apply lash serum, and for how long

Apply once a day, as directed. Use a thin layer on clean, dry skin along the upper lash line and let it dry fully before applying other products.

There is no fixed timeline for a change in appearance. How quickly you notice a difference varies from person to person. Follow the current product label if you have questions about how long to continue.

5 mistakes that waste a tube

Over-applying. The product directions call for a thin line once daily. A thicker coat just uses more serum. One dip, one thin pass for both eyes.
Applying to a damp lash line. Straight after a shower or a face wash, the skin is still wet. Residual moisture dilutes the formula. Dry first, then apply.
Making the routine harder than it needs to be. Follow the current product directions and choose a time that fits your routine. If you miss an application, return to your usual routine the next day.
Using it on the lower lashes, or on the lash hairs. The directions are for the skin along the upper lash line, and the safety guide says to use the serum only on its intended application area. The lower lid is not that area, and neither are the lashes themselves.
Expecting a specific week for a visible change. Timing varies from person to person. Follow the current product directions and remember that individual results vary.

Wearing extensions, or just had a lash lift?

If you wear extensions or have recently had a lash lift, ask your lash technician whether and when this serum fits your routine. The formula contains no free oils, but that does not establish compatibility with a specific adhesive. Follow the serum label and the adhesive maker's aftercare guidance. For more information, read Can You Use a Lash Serum With Eyelash Extensions or After a Lash Lift?

Frequently asked questions

Do you apply lash serum before or after mascara?

Before. Apply the serum to clean, dry skin along the upper lash line. Wait until it has dried fully before applying mascara. At night, apply after removing makeup.

How often should you apply lash serum?

Once a day, at any time that suits your routine. We suggest the evening, after makeup removal. Follow the current product directions if you are considering changing your routine.

How long does lash serum take to work?

There is no fixed timeline for a change in appearance. How quickly you notice a difference varies from person to person. Use the serum as directed.

Can I apply lash serum to my lower lashes?

The directions are for the upper lash line only, and the safety guide says to use the serum only on its intended application area. Keep it to one thin line along the upper lash line and avoid direct contact with the eye.

What happens if I miss a day or stop using it?

If you miss an application, return to your usual routine the next day. Do not apply extra to make up for it. If you stop and later decide to restart, follow the current product directions.

General information about a cosmetic product, not medical advice. LashOriginals Lash Serum is a cosmetic that conditions lashes and supports the appearance of longer-looking, fuller-looking lashes. If you are pregnant or breastfeeding, or have an eye condition, ask your doctor or pharmacist.

Browse: all lash serums and lash care.