Eyebrow serum
Eyebrow serums for thin, sparse or over-plucked brows, from peptide formulas to conditioning oils. We explain which types we stock, why we avoid prostaglandin analogues and how long you need to use one.Read more →
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How eyebrow growth serums work and which type suits you
An eyebrow serum is a leave-on cosmetic that you brush along the brow line, usually once a day before bed. It does not create new hair follicles. It works with the hairs you already have, conditioning them and keeping the skin around them comfortable, so brows look fuller and more defined over time. Brow hairs grow for a few months, then rest and shed, so any visible change follows that slow rhythm. That is why serious brands talk in weeks, not days. If you are treating your lashes too, our serums for eyelashes sit in the same range.
Three types of brow serum, and how they differ
Almost every product on the UK market falls into one of three groups. The difference sits in the ingredient list, not in the marketing.
- Peptide serums. Peptides are short chains of amino acids. They are usually combined with panthenol, biotin or ginseng extract. This is the most common cosmetic route.
- Conditioning oils and blends. Castor oil, squalane, vitamin E. These aim at suppleness, shine and less breakage rather than density.
- Prostaglandin analogue serums. Ingredients such as isopropyl cloprostenate. Pharmacologically active next to the eye, and the reason for the paragraph below.
Where we draw the line on ingredients
In February 2026 the EU Scientific Committee on Consumer Safety concluded that three prostaglandin analogues used in lash and brow serums cannot be considered safe for cosmetic use. Reported effects include permanent darkening of the iris and loss of fat around the eye, which changes the contour of the eye socket. Most packs do not mention this. We therefore keep our brow shelf free of these ingredients and stay with formulas that are suitable for daily use close to the eye.
How we choose the brow serums we stock
We judge a serum on three things: the type of ingredient, the amount stated on the label and whether the combination makes sense so close to the eye. Peptide and panthenol formulas pass. Serums built on a prostaglandin analogue do not, even when they sell well elsewhere. We buy directly from the brands, so every bottle is authentic, and our compliance team reads the full ingredient list before a product goes live. We test products ourselves and independent labs spot-check batches. In more than ten years we have learned that a short, clear ingredient list beats a long one. Read how we select our brands.
Who it suits and what to expect
A brow serum suits you if your brows are thin, patchy after years of plucking, or fragile after lamination or tinting. It works best where the follicle is still active. If an area has been bare for many years, expect better condition and shine rather than full regrowth: useful, but worth knowing before you buy. Give it four to six weeks for the first signs and eight to twelve weeks before you judge it. Skip days and the clock effectively restarts.
Brows also respond to what happens under the skin. Some people pair a serum with supplements for hair growth and keep the area simple otherwise: no oils layered on top, no makeup remover rubbed hard into the brow.
A serum stays a cosmetic step. It is not a treatment for hair loss with a medical cause, so if your brows thin quickly or in clear patches, speak to your GP first. For a wider routine, look at our range for hair, skin and nails.
Frequently asked questions
What does an eyebrow serum actually do?
It is a leave-on cosmetic for the brow line. Peptides, panthenol and plant extracts condition the hairs you already have and keep the skin around them in good condition, so brows look fuller, darker and more even. It does not create new follicles. Think of it as care for existing hair, in the same way a conditioner works on the hair on your head. The effect builds while your brow hairs move through their natural growth cycle.
How long before I see a difference?
Most brands mention four to six weeks for the first signs and eight to twelve weeks for the full picture. That timing is not marketing, it follows the brow growth cycle: a brow hair grows for a few months, then rests and sheds. You only see a change once new hairs have come through. Daily use matters more than the amount you apply. One dip covers both brows, and skipping several days will stretch the timeline.
Which type of eyebrow serum should I choose?
It depends on whether your main concern is density or condition. This is how the three types compare.
| Type | Typical ingredients | Suits |
|---|---|---|
| Peptide serum | Peptides, panthenol, biotin | Sparse or over-plucked brows |
| Conditioning oil | Castor oil, squalane, vitamin E | Dry, brittle brows after tinting |
| Prostaglandin analogue | Isopropyl cloprostenate and similar | Not stocked by us on safety grounds |
For most people a peptide serum is the sensible starting point. Add an oil only if your brows feel dry.
How do I apply it and where does it fit in my routine?
Apply to clean, dry skin, so remove makeup first with an oil-free cleanser. Brush a thin layer along the whole brow line, at the base of the hairs rather than over the top. One dip is enough for both brows. Let it dry fully before anything else goes on. Evening use is easiest because the serum then sits undisturbed. If you use actives such as retinol or acids from our skincare range, keep them away from the brow area.
Can a serum help brows that were over-plucked years ago?
Partly, and the honest answer depends on the follicle. Where the follicle is still active, consistent use can support the growth cycle and the area fills in over a few months. Where a spot has been plucked bare for many years, the follicle may no longer produce hair, and no cosmetic serum changes that. In those cases the serum still improves the condition, shine and hold of the hairs you do have, which makes the shape easier to fill with a pencil.
Are eyebrow serums safe to use so close to the eye?
A well-formulated cosmetic serum is designed for daily use near the eye, but the ingredient list decides. Patch test behind the ear or on the inner arm for 24 hours first, especially if you have sensitive skin. Mild stinging, redness or itching means stop. Keep the applicator clean and never share it. Avoid products containing prostaglandin analogues: the EU Scientific Committee on Consumer Safety judged three of these ingredients unsafe for cosmetic lash and brow use in February 2026.
Can I use a brow serum after lamination, tinting or a brow tattoo?
After lamination or tinting a serum is a logical next step, because both processes leave the hair drier and more brittle. Wait until any redness has settled, usually a day or two, then start daily use. With microblading or a brow tattoo, ask your technician first. Oil-free formulas are generally preferred, since oils can affect pigment. A serum does not remove or lighten pigment, but it can change the density of the hair around the shape you had drawn.
How do I spot a prostaglandin analogue on an ingredient list?
Read the INCI list at the end of the pack and look for the fragments -prost- or -cloprostenol-. The three names assessed by the EU committee are isopropyl cloprostenate, methylamido-dihydro-noralfaprostal and dechloro dihydroxy difluoro ethylcloprostenolamide. They also appear under synonyms, so any name ending in -prostenol, -prostal or -prostenolamide deserves a second look. These ingredients work like glaucoma eye drops, which is why reported effects include permanent iris darkening and fat loss around the eye. We do not stock them.
