The best lash serum under $20, tested
8 min read · Updated July 2026
Premium lash serums can run $100 or more. So can a $16 bottle actually compete? We put The Ordinary Multi-Peptide Lash & Brow Serum — the cheapest product in our entire ranking — through the same 12-week panel and rubric as everything else, no exceptions made for price.
The contender
At $16, The Ordinary's entry is built around Myristoyl Pentapeptide-17 — the exact same headline peptide used in serums costing four to eight times as much, including several serums in our top five. It's rounded out with Provitamin B5 and caffeine, and it's marketed for both lashes and brows, which adds value if you're using it on both.
How it scored
It landed at 8.0/10 on our rubric — good enough for our #8 spot out of ten. That's not a fluke: sharing a headline active with premium serums genuinely shows up in the formulation score. Where it lost ground was speed. Panelists using it reported first signs around week 8, well behind QUALASH's week 4–6, with the clearest gains not showing until closer to week 12.
Where the savings actually show up
The formula holds its own, but the experience around it is where you feel the price difference: a simpler applicator, no fragrance or finishing extras, and a wait that tests your patience more than a premium bottle would. None of that changes what's actually reaching your lash line — it just means you're paying for convenience and speed at the premium end, not for a fundamentally different mechanism.
Is the wait worth the savings?
If you're trying a serum for the first time and aren't sure you'll stick with a nightly routine, starting cheap is a reasonable way to find out — the ingredient is doing real work, you're just trading time for money. If you want the fastest possible result and budget isn't the deciding factor, our #1-ranked QUALASH or the mid-priced UKLASH will get you there sooner.
Other value picks worth knowing
UKLASH ($45) sits between the two extremes — a similar peptide family to the premium tier, most of the early gains, at roughly a third of QUALASH's price. See the full lineup, prices and formulas on the Top 10 ranking.
Compare it against the premium picks
See how price, formula and speed trade off across all ten ranked serums.
See the Top 10 →