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Updated 21 August 2026 · all units bought at retail · no paid placements
Ten serums, one panel of twenty-four people, twelve weeks each. The shortlist is drawn from what Britain actually buys and searches for — the Boots and Superdrug shelf, the Cult Beauty and LookFantastic bestseller lists, and the brands that dominate UK search. Every position is the outcome of the same four-column score.
The strongest twelve-week result we recorded from a formula with no prostaglandin analogue in it. Density moved first, at roughly week five, and length followed; by the end of the trial the inner corner had filled in on 19 of our 24 testers. Nobody withdrew over irritation, and the 3.5 ml tube outlasted every other small-format serum on the panel.
Britain's most searched lash serum, and it earns the position rather than inheriting it: second on growth, first on handling. The brush is fine enough to lay a single clean line along the lash root, which matters more than it sounds when you are applying at 11pm. Slower to start than the winner, and the tube runs out sooner.
The serum most often discounted into a British shopping basket — LookFantastic and Boots rarely leave it at full price for long. Growth was consistent and the brush is well made. The prostaglandin analogue is the only thing separating it from a podium place, and it is the reason the safety column is capped.
The beauty-editor default, and the highest raw growth figure anywhere on this page — visible change arrived by week three. It is also the clearest illustration of the trade-off the ranking is built around: two testers reported lid dryness and one a persistent itch, and at roughly £35 a month it is the costliest routine here.
The department-store option, and the longest-lasting bottle in the group at five to six months — which quietly turns a punishing shelf price into a mid-table monthly cost. Growth was steady rather than dramatic. The MDN active belongs to the prostaglandin family, whatever the counter tells you.
A dependable middle of the table, bought mostly through Amazon UK. The growth figure is modest, but the condition of the lash line improved on almost every tester — less breakage, more shine. If heavy mascara has been doing damage, that matters more than a headline growth claim.
The pharmacy staple: on the shelf in Boots and Superdrug, frequently under £25, and the cheapest way in Britain to buy prostaglandin-driven growth. That is also why it sits here — a mid-table result carrying a top-table risk profile. Accept the risk and there are stronger formulas; reject it and there are safer ones.
A Cult Beauty regular, beautifully made and genuinely pleasant to use, with a result that reads as conditioning rather than growth. It belongs in a routine where lashes are thinning from extensions or heavy mascara, not one aimed squarely at length.
Sold on the promise of one stroke a night and a tube that lasts, and the week-twelve figure was genuinely strong. What it does not do is justify the price: two tubes to complete a full course makes it one of the most expensive routes to a result on this page, with the same caveat as the rest of its family.
The most searched-for lash product in Britain and the smallest gain on the panel — both of those are true at once. At around £6 a month it costs less than a fortnight of the winner, it works on brows as well, and it produced a small but real improvement in fullness. The sensible first serum if you have never used one.
Side by side
| # | Serum | Score | Growth | Prostaglandins | Size | Price | Per month |
|---|---|---|---|---|---|---|---|
| 01 | Qualash Advanced Eyelash Serum | 9.4 | Strongest result on the panel | None declared | 3.5 ml | £39 | £13 |
| 02 | UKLASH Eyelash Serum | 9.0 | Very strong | None declared | 3 ml | £39 | £15 |
| 03 | GrandeLASH-MD Lash Enhancing Serum | 8.7 | Very strong | Yes | 2 ml | £35 | £12 |
| 04 | RevitaLash Advanced | 8.5 | Strongest, and the fastest to show | Yes | 2 ml | £104 | £35 |
| 05 | M2 Beauté Eyelash Activating Serum | 8.0 | Strong, steady | Yes | 5 ml | £120 | £22 |
| 06 | XLash Eyelash Serum | 7.7 | Moderate | None declared | 3 ml | £49 | £16 |
| 07 | RapidLash Eyelash Enhancing Serum | 7.5 | Moderate | Yes | 3 ml | £27 | £9 |
| 08 | Sweed Lash Serum | 7.2 | Gentle, conditioning | None declared | 3 ml | £42 | £14 |
| 09 | LiLash Purified Eyelash Serum | 6.9 | Strong | Yes | 2 ml | £90 | £30 |
| 10 | The Ordinary Multi-Peptide Lash and Brow Serum | 6.7 | Subtle | None declared | 5 ml | £14.20 | £6 |
On prices. UK retail prices move constantly, brands run subscription discounts, and LookFantastic in particular rarely sells this category at full price. Treat the figures above as a guide and check the current price before you buy — the ranking is built on results and formulas, not on the price of the week.
On the shortlist, off the ranking
About £55 direct. Strong performer, but the brand sells two formulas under near-identical packaging — one with a prostaglandin analogue, one without — and we could not guarantee panel consistency this round.
About £39 at Boots. A botanical conditioner rather than a growth serum, and the oldest formula in the category by decades. Gentle, long-lasting, but it belongs in a different comparison.
About £115 at Cult Beauty. Queued for the next round; at this price it deserves a full panel rather than a partial one.
About £30 at Boots. A fast-rising British name driven by social video, added to the queue for the next update.
Next panel opens in the autumn. Twenty-four places, twelve weeks, no brand involvement.