Short answer: Remove makeup and contact lenses, dry the lid, then draw a single stroke of serum along the skin where your upper lashes grow, once a day. Skip the lower line, let it dry for two or three minutes, treat your brows with the same brush, and photograph progress at weeks 0, 4, 8 and 12.
We make an eyelash and eyebrow serum, so we have a stake in this. That is also why we care about how people apply it: most of the disappointed messages we get trace back to technique, not to the formula. This guide is the routine we would hand a friend who just bought an eyelash serum for growth, from prep to progress photos.
Whether lash serums work is a separate question. In one sentence: cosmetic serums condition lashes and brows so fewer break, which can make them look fuller over a few months, and our pieces on lash serums without prostaglandins and how to grow eyelashes go through the evidence.
Get the lid ready first
A serum can only work on the skin it actually reaches. Three things get in its way.
Makeup and remover residue. Mascara, liner and eyeshadow sit exactly where the serum needs to go. Oil-based removers and micellar water leave a film behind, and a water-based serum slides over that film instead of settling on the lash line. Take everything off, then rinse the area with plain water or wash your face as usual.
Water. On a wet lid the serum spreads, thins out and runs toward the eye. Pat dry and wait a minute.
Contact lenses. Take them out before you apply and keep them out until the serum has dried. Lenses can hold on to anything that drifts onto the eye surface.
How to apply eyelash serum, step by step
- Wipe the brush. Pull the applicator out and run it once against the rim of the tube. You want a brush that is damp, not dripping.
- Look down into a mirror. Tilting your chin up slightly and gazing downward stretches the upper lid and shows you the base of the lashes clearly.
- Draw one stroke from the inner corner outward. Place the brush on the skin right where the lashes emerge, as you would a fine eyeliner, and sweep to the outer corner in one movement. The target is the root area, not the lash tips.
- Repeat on the other eye without reloading if the brush still leaves a visible sheen. Most brushes carry enough for both.
- Do your brows. Use what is left on the brush, or reload lightly, and trace the sparse areas and the outline of the brow.
- Leave it alone for two to three minutes. No blinking hard, no touching, no pillow.
How much is enough
Less than you think. One stroke per eye is the whole dose. Extra product does not reach the follicle faster; it pools, migrates into the eye and is the most common reason for stinging or redness. The US prescribing information for bimatoprost, the one prescription lash drug, makes the same point about its own solution: applying more often or more heavily does not increase lash growth.
If you can see a wet line after application, you used too much. A faint sheen that disappears within a couple of minutes is the right amount.
Why we leave out the lower lash line
When you blink, the upper lid sweeps down over the lower one. Serum applied to the upper line reaches the lower lashes in small amounts on its own. Adding a separate stroke below puts product right at the rim of the eye, where tears carry it straight onto the eye surface. The bimatoprost label rules out the lower lid entirely, and our own directions name the upper lash line only.
Morning or night?
Our serum is made for once-a-day use, and we suggest the evening, after you have taken your makeup off. The lid is already clean, nothing goes on top of the serum afterwards, and an evening habit tied to brushing your teeth is hard to forget.
Mornings work too, as long as the serum dries fully before any eye makeup goes on. The time of day matters far less than doing it every day.
Brows in the same routine
Most peptide serums, ours included, are meant for lashes and brows. The brow routine is simpler: clean, dry skin, then brush the serum over the sparse patches and along the natural outline, working with the direction of the hair. Pay attention to the tail, which is often the thinnest part after years of plucking. Keep brow serum well above the eye so it cannot run down. If your brows are what bother you most, how to grow eyebrows back covers overplucking and the brow side in more depth.
How to take progress photos that tell the truth
Lashes change slowly and you see them every day, so memory is a poor judge. Photos are the only fair test, and only if every picture is taken the same way.
- Same light. Daylight from one window, same time of day. Bathroom ceiling lights cast shadows that hide or invent lashes.
- Same angle. Phone at eye level, about a hand's width away, eyes looking slightly down so the upper lashes show against the lid. Then one shot looking straight ahead with the brow in frame.
- Bare lashes. No mascara, no curler, no tint. Anything cosmetic makes comparison useless.
- Four dates. Week 0 before your first application, then weeks 4, 8 and 12. Put them in one album and do not compare in between.
The 8 to 12 week habit
Each lash has its own growth period of roughly four to ten weeks before it rests and eventually sheds, according to a review of eyelash follicle biology in the Journal of Optometry. At any moment only some of your lashes are growing. That is why nothing a serum does can show up in the first days: you are waiting for a generation of lashes to grow in under better conditions. We ask people to commit to at least eight weeks, and to make their judgment around week 12 with the photos side by side. If you stop, the conditioning effect fades gradually as breakage returns to whatever your habits produce.
Common mistakes and how to fix them
| Mistake | What happens | Fix |
|---|---|---|
| Too much product | Serum pools and runs into the eye, stinging and redness, no extra benefit | Wipe the brush on the rim; one stroke per eye |
| Applying on wet skin | Serum thins out and drifts toward the eye instead of staying at the roots | Pat dry, wait a minute, then apply |
| Applying over remover residue | A film stops the serum from reaching the skin | Rinse the lid with water after removing makeup |
| Skipping days | The new lashes grow in without steady support; results look patchy | Tie it to toothbrushing; keep the tube next to your toothbrush |
| Doubling up after a missed day | More irritation risk, no catching up | Just carry on with one stroke the next day |
| Rubbing your eyes | Pulls out lashes and pushes serum into the eye | Pat, never rub, when eyes itch or water |
| Stroking the lower line | Product sits at the rim of the eye | Upper line only; blinking does the rest |
| Judging at week 2 | Nothing visible yet, so people quit | Compare photos at week 8 and week 12 only |
If your eyes feel irritated
A brief cool or tingly feeling while the serum dries can happen. Burning, redness that lasts, itching, swelling or watering is different. In that case, rinse the eye with clean water, stop using the serum and let everything settle for a few days. When it has calmed down, you can try again every second day with a lighter stroke, placed a little further from the rim. If the reaction comes back, stop for good.
See an eye doctor if redness or swelling does not go away within a day or two, if the eyelid skin darkens, or if your vision changes in any way. If you have glaucoma, an eye infection or inflammation, are pregnant or breastfeeding, or are being treated for a condition that affects your lashes, check with your doctor before you start. We go through the specific warning signs and what makes some people more reactive in eyelash serum for sensitive eyes.
Mascara, extensions and lash lifts
Mascara is fine. Apply serum at night on bare lashes and mascara in the morning, or wait until a morning application has fully dried. The more important part is taking mascara off: soak a pad in remover, hold it on the closed eye for a few seconds, and wipe down instead of scrubbing. Waterproof formulas need the most gentleness.
Extensions. Serum and oils can loosen the bond that holds extensions in place. If you wear them, apply with an almost dry brush, only to the skin right at the roots, and keep it off the glue.
Lash lifts and tints. Pause the serum for a day or two before and after the treatment so the lashes and lid are clean and calm for the lift solution. After that, the two sit together well; a lift makes new growth easier to see.
If you want to see the ingredient list before you decide, it is on the product page. For how a lash serum fits into the rest of your evening, skincare layering order has the sequence.
This guide is general information, not medical advice. For anything that worries you about your eyes, an eye doctor is the right person to ask.
Sources
- U.S. Food and Drug Administration, Latisse (bimatoprost ophthalmic solution) 0.03% prescribing information: https://www.accessdata.fda.gov/drugsatfda_docs/label/2012/022369s005lbl.pdf
- Aumond S, Bitton E, The eyelash follicle features and anomalies: A review, J Optom (2018): https://www.journalofoptometry.org/en-the-eyelash-follicle-features-anomalies-articulo-S1888429618300487
- American Academy of Ophthalmology, What You Should Know About Eyelash Growth Serums: https://www.aao.org/eye-health/tips-prevention/latisse
- Baiyasi M, St Claire K, Hengy M, et al., Eyelash serums: A comprehensive review, J Cosmet Dermatol (2024), PubMed: https://pubmed.ncbi.nlm.nih.gov/38475901/
Frequently asked
Should I apply lash serum morning or night?
Either works if you do it every day. We suggest night: the lid is already clean after makeup removal, nothing goes on top afterwards, and an evening habit next to toothbrushing is easy to keep. If you apply in the morning, let the serum dry for two to three minutes before any eye makeup.
Can I wear mascara with lash serum?
Yes. Put the serum on bare, clean lashes, ideally at night, and wear mascara as usual the next day. Removal matters more than the mascara itself: soak a pad, hold it on the closed eye for a few seconds and wipe gently downward so you do not pull out the lashes you are trying to keep.
Can I use lash serum with extensions or a lash lift?
With care. For extensions, use a nearly dry brush and keep the serum on the skin at the roots, away from the glue, since liquids can weaken the bond. For a lift or tint, pause for a day or two before and after the appointment, then continue as normal.
What happens if I miss a few days?
Not much. Pick up again with one stroke per eye and do not double the amount to make up for it, because extra product raises the risk of irritation without adding benefit. Regular gaps do matter over weeks, so if you keep forgetting, move the tube next to your toothbrush.
