How to Apply Eyelash Serum Correctly: 6 Steps and 5 Mistakes to Avoid (UK Guide)

To apply eyelash serum correctly, start with clean, dry skin and no mascara. Draw one thin line along the base of your upper lashes, from the inner corner to the outer corner, using one stroke per eye. Skip the lower lash line, let it dry for a couple of minutes, and repeat once a day, ideally at night. Keep going consistently, because lash serums are designed for regular use rather than a quick fix. Most of the mistakes people make come down to using too much, applying at the wrong time, or putting it on top of other products.

In this article

• Where exactly do I put eyelash serum?
• What are the 6 steps?
• What are the common mistakes?
• How do I use a lash serum safely?
• FAQ

Where exactly do I put eyelash serum?

Apply it to the skin right at the base of your upper lashes, like drawing a very thin line of eyeliner. The product is meant to sit at the lash line, not on the lashes themselves. You do not need to coat the lashes or the lower lid. Blinking naturally spreads a little product around, so a light touch is enough.

What are the 6 steps to apply it correctly?

1. Remove all makeup first. Take off mascara and liner with an oil-free eye makeup remover, then pat the lash line dry. Serum on top of residue or damp skin will not sit well.
2. Take off contact lenses. Put them back in only after the serum has dried.
3. Use one thin stroke per eye. Sweep the applicator along the upper lash line from the inner corner to the outer corner. More product does not mean faster results, and extra product can simply irritate.
4. Leave it to dry. Wait two to three minutes and keep your hands away from your eyes.
5. Do it at the same time each day. Night works well for most people because you are already cleansing and not wearing makeup. Pick a time you will actually stick to.
6. Keep your skincare order sensible. Cleanse, apply your lash serum, wait a minute or two, then continue with eye cream and moisturiser.

What are the 5 most common mistakes?

Mistake	Why it causes problems	What to do instead
Applying to the lower lash line	Adds nothing useful and can irritate	Upper lash line only
Using two or three swipes	More product spreads onto the lid	One thin stroke per eye
Applying over mascara or oily residue	The serum cannot reach clean skin	Cleanse and dry first
Putting makeup on before it dries	Smudges and wastes product	Wait two to three minutes
Giving up after two weeks	Lashes grow slowly in cycles	Stay consistent for several weeks and judge over time

How do I use a lash serum safely?

Eyes are delicate, so a little care goes a long way. Always read the ingredient list and the instructions on your pack. Some lash serums sold in the UK contain prostaglandin-type ingredients, which are drug-like and linked to side effects such as eyelid skin darkening and irritation. Researchers Dr Alison Ng and Dr Byki Huntjens, writing in City St George's, University of London, advise checking labels for ingredients ending in "-prost" and speaking to an eye care professional before using lash-enhancing products. They also note that oil and peptide based serums are likely to carry less risk.

Whatever you use, patch test first, stop if you notice redness, stinging, swelling or any change in your vision, and speak to a pharmacist or optician if symptoms continue. Cosmetic lash conditioners are for conditioning the look of your lashes. They are not a medical treatment.

New to the topic? Our guide How Long Does an Eyelash Serum Take to Work? explains a realistic timeline.

Frequently asked questions

Can I use eyelash serum on my lower lash line?

No. Stick to the upper lash line. Blinking spreads a little product anyway, so applying to the lower lid adds irritation risk without any benefit.

Should I apply lash serum in the morning or at night?

Night is easiest for most people because your face is clean and bare. A morning routine works too, as long as the lash line is clean and the serum is fully dry before makeup. Consistency matters more than the time.

Can I wear mascara with eyelash serum?

Yes, once the serum has dried. Remove mascara fully with an oil-free remover before your next application. You can also read how to remove eye makeup without losing lashes.

What if I miss a night?

Just carry on the next night. Do not double up to catch up.

Can I use lash serum with contact lenses?

Take your lenses out before applying and put them back only after the serum has fully dried. Applying at night avoids the problem.