Scroll through TikTok and you'll see it everywhere: castor oil as the cheap, "natural" way to grow longer lashes. It's one of the most-searched lash hacks out there — but does it actually work, and how does it really compare to a proper lash serum? Let's get into it, honestly.
What castor oil actually does for your lashes
Castor oil is rich in ricinoleic acid and triglycerides, which makes it a lovely conditioner. Applied to your lashes, it can hydrate them, reduce breakage and make them look glossier, healthier and a little fuller — because well-conditioned lashes snap off less easily.
But here's the honest bit: there is no strong scientific evidence that castor oil actually grows lashes. Dermatologists are clear that there are no high-quality clinical trials showing castor oil increases lash length or density — the "it grew my lashes" stories are largely anecdotal, and likely down to conditioning and less breakage rather than genuine new growth ([Medical News Today](https://www.medicalnewstoday.com/articles/325541)). It's a moisturiser for your lashes, not a growth treatment.
What a lash serum does differently
A peptide lash serum is formulated to do the thing castor oil can't: support your lashes' natural growth phase. Active ingredients like Biotinoyl Tripeptide-1 and Myristoyl Pentapeptide-17, alongside biotin, panthenol and caffeine, are designed to nourish the lash line and support the look of longer, fuller, stronger lashes over a full growth cycle.
The other big difference is testing. A good lash serum is developed specifically for the delicate eye area and put through proper testing — our By Babes Lash Growth Serum is third-party clinically tested, vegan, prostaglandin-free and made in the UK. Castor oil, by contrast, is a kitchen-cupboard oil that was never designed for your lash line.
Lash serum vs castor oil: the honest head-to-head
- Evidence: Lash serums are formulated and tested for lash enhancement. Castor oil has no clinical evidence for actual growth — only conditioning.
- Results: A serum is designed to deliver visible length and fullness over 4–12 weeks. Castor oil may make lashes look healthier and shinier, but won't meaningfully grow them.
- Safety: A purpose-made serum is formulated for the eye area. Castor oil is thick and can migrate into the eye, and some people get irritation, redness or little bumps (milia) around the lash line.
- Convenience: A serum is a quick one-swipe step. Castor oil is messy, slow to apply neatly, and easy to get in your eyes.
- Cost: Castor oil is cheaper upfront — but if your goal is genuinely longer lashes, you may simply be spending less to get less.
So, should you ditch castor oil?
Not necessarily — if you love it as a gentle, budget conditioner to keep your lashes soft and reduce breakage, it's fine to keep using (just keep it out of your eyes). But if your actual goal is visibly longer, fuller lashes, a purpose-built, clinically tested lash serum is the route that's designed — and tested — to get you there.
Our clinical results
We don't just say our serum works — we had it independently, third-party clinically tested for length, fullness and lash health.
[CLINICAL RESULTS CHART TO BE INSERTED HERE — placeholder, remove before publishing.]
The takeaway
Castor oil conditions; a lash serum is built to grow. If you want lashes that look healthier, castor oil can help — but if you want them genuinely longer and fuller, backed by testing rather than TikTok, that's exactly what a proper lash serum is for.
Ready for real results? Meet our prostaglandin-free, clinically tested Lash Growth Serum — loved by over 100,000 babes. 💕
This article is for general information and isn't medical advice. If you have sensitive eyes or any concerns, patch test and check with a professional before trying a new lash product.
