Castor oil is one of the internet’s most popular natural eyelash remedies, but helping lashes look conditioned is not the same as scientifically stimulating new lash growth.
Does castor oil make eyelashes grow?
Strong clinical evidence that castor oil makes eyelash follicles produce new or longer hairs is lacking. A systematic review found weaker evidence that castor oil may improve hair luster, but no strong evidence supporting it for hair growth. A 2024 review of eyelash serums also concluded that non-prostaglandin ingredients need more formal research.
What can castor oil do?
Castor oil is thick and coats the hair shaft. A light coating can make lash hairs look glossier and more defined and may help dry-feeling hairs feel conditioned. It is best understood as cosmetic lash care, not as a prescription-style growth treatment.
Why application matters
The biggest practical drawback is texture. Thick oil from a large bottle can easily end up on the eyelid, fingers, pillowcase, or in the eye. More is not better. A tiny amount is enough to lightly coat the hairs.
The Live Fraiche Organic Lash & Brow Growth Serum puts 100% USDA Organic cold-pressed castor oil in a dual-ended tube. The fine brush supports controlled application near the upper lash area, while the spoolie distributes oil through lash and brow hairs.
Keep castor oil out of your eyes
Cosmetic use around the lashes is not the same as putting castor oil into the eye. Cleveland Clinic warns that castor oil in the eyes can cause irritation, pain, blurred vision, and eye injury. Apply sparingly, stop if irritation occurs, and seek care for persistent symptoms.
Castor oil versus a lash-growth medication
Prescription bimatoprost has demonstrated biological effects on eyelashes and is FDA approved to increase growth, including length, thickness, and darkness. Castor oil has not been shown to have the same effect.
Frequently asked questions
Is castor oil a prostaglandin?
No. Castor oil is a plant-derived oil, not a prostaglandin analog.
How much should I use?
Very little. Lashes should look lightly coated, not saturated.
For a step-by-step routine, read How to Apply Castor Oil to Eyelashes Without Making a Mess.
Sources
- Systematic review of castor and other hair oils (2022)
- Eyelash Serums: A Comprehensive Review (2024)
- Cleveland Clinic: Castor Oil Benefits and Uses
This article is for general education and is not medical advice.
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