We buy every lash serum at UK retail price, run it through a structured 8–12 week trial with real users, check the INCI list against the UK Cosmetics Regulation, and only then score it. Brands cannot pay for a place on this site — there is nothing to buy here, and no adverts to sell.
Last reviewed: 13 August 2026
Each serum gets four sub-scores out of 10, weighted and combined into the single figure you see in the ranking. Results carry half the score because that is what people buy a serum for. Safety carries a fifth, and it is the reason a fast product can still be labelled and caveated rather than simply recommended.
Change in lash length and density measured from standardised photographs at weeks 0, 6 and 12, alongside tester self-reports.
Prostaglandin analogue screening, fragrance and preservative check, plus every reported case of stinging, redness or eyelid darkening. Any analogue caps this score — a clean 12-week trial cannot tell you what three years of use does.
Where the active peptides, biotin and panthenol sit in the INCI list, and whether the concentration is plausible rather than decorative.
Cost per month in pounds, based on how long a tube actually lasted our testers — not on the RRP printed on the box.
Every serum in the ranking is purchased anonymously from a UK retailer at the price a reader would pay. We do not accept PR samples for testing, because a sample sent by a brand cannot be verified as the same batch sold in shops.
Before anyone applies anything, the full ingredient list is checked against the UK Cosmetics Regulation and flagged for prostaglandin analogues such as isopropyl cloprostenate, norbimatoprost, dehydrolatanoprost and dechloro dihydroxy difluoro ethylcloprostenolamide — and for natural prostaglandin sources such as Black Sea Rod Oil, which no -prost keyword search will catch. In its final opinion of 2 February 2026, the EU's Scientific Committee on Consumer Safety concluded these ingredients cannot be considered safe in cosmetic lash and brow products. Any serum containing one is labelled clearly in the ranking, whatever it scores elsewhere — including the product currently at number one.
A panel of 20–30 UK testers applies the serum nightly, following the manufacturer's instructions. Standardised photographs are taken at weeks 0, 6 and 12 under fixed lighting, and testers log irritation, comfort and how far through the tube they are. Anyone who stops early tells us why — that data counts too.
Sub-scores are assigned from the trial data, weighted, and combined. Before publishing, the number is sanity-checked against the raw photographs and tester logs. If a formula changes, the product is retested and the score moves with it.
Rankings go stale. Every list is re-run twice a year, and sooner if a formula is reformulated or a regulator issues a warning. The review date is shown on every page.
It isn't, commercially. There are no adverts on this site, no affiliate links, no sponsored placements and no commission of any kind. When we link to a shop, it is because that is where the product is sold — we earn nothing whether you click it or not.
Every product is bought at full UK retail price out of our own pocket. We do not accept PR samples, gifted products, paid trips or brand partnerships, and we do not sell anything ourselves.
If that ever changes, it will be stated here first, in plain language, before it appears anywhere else on the site.
The only exception is technical: our host records standard server logs, and the web font is loaded from Google Fonts, which sees your IP address. If you would rather it did not, the site is fully readable with the font blocked.
We are reviewers, not clinicians. Nothing on this site is medical advice. If you have an eye condition, glaucoma, are pregnant or breastfeeding, or you are already using a prescribed eye medicine, speak to your GP, pharmacist or optometrist before starting any lash serum. Stop using a product and seek advice if you notice redness, swelling, itching or any change to your eyelids or vision. Suspected side effects from a cosmetic product sold in the UK can be reported to your local Trading Standards service.
Fifteen products, one scoring system, nobody paying for a place.