Key Takeaways
- The premium pick at 35% off: The Grande Cosmetics GrandeLASH-MD 3-month supply is the bestseller in the category and rarely drops this far below sixty bucks.
- Castor oil under $10: The Kate Blanc Castor Oil at 49% off is the cheapest path to a nightly lash routine if you’re skeptical of peptide formulas.
- Steepest markdown of the week: The BIYSBER Lash Serum is cut 75%, the deepest discount in this entire roundup.
- Trusted-brand sleeper: The Clinique Take The Day Off remover is half off and the gentlest way to clean lashes before applying serum.
- Prices verified May 23, 2026.
Late May tends to be when people start eyeing their pre-vacation routines, and lashes are usually first on the list. Mascara smudges in humidity, falsies feel like a project at the pool, and the idea of waking up with lashes that already look like something has obvious appeal. That’s the corner of beauty I waded into for this week’s Berry Basket.
What surprised me digging through the data: the peptide serum category is unusually soft on price right now. Grande Cosmetics, which almost never moves below its anchor price outside of Sephora sales, is sitting at 35% off. A handful of smaller peptide brands like Tistees, GOLRISEN, and Balancexlite are clustered in the under-$20 range, which is roughly where this category lives when Memorial Day pressure kicks in. Castor oil sellers got the memo too, with Kate Blanc and Cliganic both under ten dollars.
I split the picks into peptide serums, castor oils for the budget-conscious crowd, and one excellent lash-friendly makeup remover from Clinique that pairs naturally with any of these. If you missed last week’s beauty roundup, a few of those castor oils are still discounted.
Are peptide lash growth serums worth the money?
Peptide-based serums are the closest you’ll get to prescription lash treatments without a doctor’s visit, and the discounts this week make them more reasonable than usual. The honest answer on whether they work: most people see something after 6 to 8 weeks of nightly use, but results vary by person and by formula concentration. Below are seven peptide picks ranging from drugstore-cheap to mid-tier salon prices.
Grande Cosmetics GrandeLASH-MD
If you only buy one peptide serum from this list, this is the one. GrandeLASH-MD has held the top spot in the lash serum category for years, and the 3-month supply at 35% off is the cleanest price I’ve tracked outside of Prime Day. The formula uses myristoyl pentapeptide-17 and is ophthalmologist tested, which matters if you’re applying anything to the lash line nightly.
- 3-month supply, 2mL
- peptide and vitamin formula
- ophthalmologist tested, cruelty-free
BIYSBER Lash Serum
BIYSBER’s serum is the wild card of the bunch. The 75% markdown looks suspicious on paper, and I’d treat the original price as decorative rather than literal. That said, it’s a vegan peptide formula marketed for sensitive eyes, it ranks high in the category, and at under twenty dollars it’s a reasonable gamble if Grande Cosmetics is outside your budget.
- vegan formula
- marketed for sensitive eyes
- lash and brow use
Leidyann 2-in-1 Lash and Brow Serum
Leidyann’s dual-ended applicator is the clever bit here. One end does lashes, the other does brows, both with a peptide and vitamin formula in 5mL tubes. If you’re trying to grow out an overplucked brow shape at the same time you’re babying your lashes, the convenience of one product for both is worth the asking price.
- dual-ended applicator
- peptide and vitamin formula
- 5mL plus 5mL tubes
GOLRISEN Eyelash Growth Serum
GOLRISEN’s hook is the myristoyl pentapeptide-4 in its 4mL tube, the same active ingredient family used in pricier salon brands. At 40% off, this is the lower-cost peptide option that still names a specific active rather than hiding behind a proprietary blend. Worth a try if you want to know what’s actually in your serum.
- myristoyl pentapeptide-4
- 4mL tube
- advanced lash enhancing formula
Balancexlite Eyelash Growth Serum
Balancexlite Plus markets this as a nourishing serum for thicker lashes, with a vegan, no-animal-testing claim in a 3mL bottle. It sits in the mid-tier price range for this list and has a respectable bestseller rank. Not as data-rich on its ingredient list as I’d like, but a reasonable middle option if you want something between drugstore prices and Grande Cosmetics money.
- 3mL nourishing formula
- vegan, no animal testing
- gentle for sensitive lash line
Tistees Lash Serum
Tistees is one of the higher-ranked serums on this list at bestseller #6, which usually signals real customer pull rather than gamed reviews. The 5mL tube gives you more product than several pricier options, and it’s specifically marketed for sensitive eyes. Solid value at under twelve dollars.
- 5mL volumizing formula
- high category bestseller rank
- formulated for sensitive eyes
PHIENEX Lash Serum
PHIENEX is the priciest non-Grande serum here, and the marketing claim of 7-day visible results deserves the side-eye I’m giving it. That said, the formula uses a botanical peptide complex, is vegan and hormone-free, and is the type of mid-tier brand that lives or dies on word of mouth. If the cheaper picks don’t impress you, this is the step up.
- botanical peptide complex
- vegan and hormone-free
- 3mL bottle
What about castor oil for lash growth?
Castor oil is the budget alternative for anyone skeptical of peptide chemistry, and the evidence is mostly anecdotal but persistent. It doesn’t grow new follicles, but it does condition existing lashes so they shed less, which can read as fuller lashes within a few weeks. Four castor oils made the cut this week, all cold-pressed and hexane-free.
Kate Blanc Cosmetics Castor Oil
Kate Blanc is the castor oil that built this whole category on social media, and it’s still the bestseller for a reason. The 2oz bottle at 49% off works out to roughly pennies per application, which makes it a no-brainer entry point for anyone curious about castor oil. Cold-pressed, hexane-free, and includes brushes for application in most listings.
- 2oz bottle, 100% pure
- cold pressed, hexane free
- lash, brow, hair use
Heritage Store Organic Castor Oil
Heritage Store gives you a 16oz glass bottle, which is genuinely a lifetime supply for lash and brow use, and most buyers end up using the rest as a hair or skin treatment. The glass packaging matters for an oil this thick because plastic can leach over months of use. If Kate Blanc’s small bottle feels too short-term, this is the upgrade.
- 16oz glass bottle
- cold pressed, hexane free
- vegan, multi-use
Cliganic Castor Oil with Eyelash Kit
Cliganic’s draw is the included eyelash applicator kit, which removes the awkward step of figuring out how to get oil on your lashes without it ending up in your eye. The 8oz size lands between Kate Blanc’s starter bottle and Heritage Store’s commitment, which is probably the right amount for most people. This one has a limited-time tag, so the price may move soon.
- 8oz bottle with applicator kit
- 100% pure organic
- cold pressed, hexane free
Cimouy USDA Organic Castor Oil
Cimouy’s 16oz glass bottle is EWG verified, which is a slightly higher bar than the standard organic certification and worth the small premium if you care about that. It’s the priciest castor oil on this list, but you’re getting a lot of product for the money and the brand is transparent about sourcing. A reasonable pick for the spa-routine crowd.
- 16oz glass bottle
- EWG verified, hexane free
- cold pressed, vegan
What pairs well with a lash serum?
Any lash growth product works better when you’re not applying it over leftover mascara. A gentle, oil-free remover is the single best companion purchase, and there’s exactly one on this week’s list worth flagging.
Clinique Take The Day Off Remover
Clinique’s Take The Day Off liquid remover is half off this week, which doesn’t happen often for a brand that’s allergy-tested and ophthalmologist-recommended. It’s oil-free, so it won’t compromise lash extensions or interfere with a serum applied afterward. If you’re starting a lash growth routine, this is the smartest add-on of the whole roundup.
- 4.2 fl oz, oil free
- gentle on lashes and lids
- allergy tested, ophthalmologist recommended
Frequently asked questions
Do cheap lash growth serums actually work?
Cheaper peptide serums can work if the formula names a real active ingredient, like myristoyl pentapeptide-17 or myristoyl pentapeptide-4. Results typically show up after 6 to 8 weeks of nightly use. Castor oil won’t grow new lashes but can condition existing ones so they shed less, which reads as fuller lashes over time.
What is the bestselling lash growth serum on this list?
Grande Cosmetics GrandeLASH-MD is currently ranked #1 in the lash serum category and is the most clinically referenced peptide serum on this list. The 3-month supply at 35% off is the strongest value, and the brand is ophthalmologist tested and cruelty-free.
Is castor oil safe to use on eyelashes?
Cold-pressed, hexane-free castor oil is generally considered safe for lash and brow use, but it should not be applied directly into the eye. Most people use a clean spoolie or applicator brush to coat the lash hairs only. Patch test on your inner wrist first if you have sensitive skin.
How long do these lash serum bottles typically last?
A 2mL to 5mL peptide serum tube usually lasts 6 to 12 weeks at one nightly application per eye. The Grande Cosmetics 3-month supply is sized at 2mL because a tiny amount goes a long way. Castor oil bottles in the 8oz to 16oz range typically last over a year of lash-only use.
Are these prices the lowest of the year?
Several picks are near their 90-day lows, including Grande Cosmetics at 35% off and Kate Blanc Castor Oil at 49% off. Memorial Day weekend often produces similar or slightly deeper discounts, so prices may dip a bit further over the next few days. Prices verified May 23, 2026.
This week’s beauty pool ran heavy on lash care, with discounts spanning roughly 29% to 75% off. The peptide serum category was the most consistent, holding a 32% to 45% off range across most brands. Castor oils landed in the 32% to 49% range, which is closer to their typical floor than a true sale event. The Grande Cosmetics discount is the standout because it touches a brand that genuinely defends its anchor price most of the year.
If I were spending my own money this week, GrandeLASH-MD is the buy. It’s the only product here with a long enough track record to predict results with any confidence, and 35% off is not a price you see often. I’d skip the BIYSBER serum unless you’re treating it as a low-stakes experiment, since a 75% markdown on a marketplace brand is more a marketing exercise than a real discount. The Kate Blanc castor oil and Clinique remover are both worth grabbing as supporting players for the routine.
Looking forward, Memorial Day weekend usually softens prices across drugstore beauty, so if mascara was on your mind, the Maybelline Lash Sensational lineup is likely to drop another notch by Monday. Peptide serums probably hold where they are through the long weekend before climbing back up in early June. If you’ve been waiting on a lash routine to start, the timing this week is about as good as it gets before Prime Day in July.
