Isa's Castor Oil Journey

How to Use Castor Oil on Your Eyelashes and Eyebrows: A Safe Step-by-Step Guide

Jul 05 2026
Isa Coelho

Castor oil on the lashes and brows is one of the most popular home routines out there, and it is easy to see why. It is simple, it is inexpensive, and it feels good to have a small nightly ritual. But let's set the honest frame from the start: castor oil does not grow lashes or brows. What it genuinely does is condition and coat the hairs you already have, so they look softer, shinier, and less brittle. Because you are working so close to your eyes, technique and cleanliness matter here more than almost anywhere else on the body. This guide walks through exactly how to do it safely.

First, an honest expectation

There is no good evidence that castor oil makes lashes or brows grow longer or thicker. Healthline's review of the hair growth research found the studies are limited and mostly anecdotal (Healthline), and Cleveland Clinic notes the same gap when it comes to castor oil's popular beauty claims (Cleveland Clinic). Healthline's lash-specific page draws the same conclusion for eyelashes directly (Healthline).

What castor oil genuinely does is condition and coat each hair. That can mean softer texture, more shine, and less breakage at the tips, which over time can make the lashes and brows you already have look fuller and healthier, simply because fewer of them are snapping off. That is a real, modest benefit, and it is worth doing correctly rather than expecting something it cannot deliver.

If you want the full breakdown of where the growth myth comes from and what the research actually says, we cover it in Does castor oil grow eyebrows?

What you need

A 100% pure, cold-pressed, hexane-free castor oil
A clean spoolie, a clean mascara or brow wand, or a cotton swab
A mirror
A clean towel

Never apply straight from the bottle onto the eye area, and never double-dip a used wand back into the bottle. Both introduce bacteria to an oil you plan to keep near your eyes for hours.

How to apply castor oil to your eyelashes

Start with a completely clean, dry, makeup-free face. Remove all mascara and eye makeup first, since oil applied over product will not do much good.
Remove contact lenses before you begin.
Dip a clean spoolie in a small amount of oil, then wipe off the excess on the side of the bottle or a tissue so the wand is barely coated.
Close the eye and sweep lightly along the top lashes from base to tip, the way you would apply mascara. Stay off the waterline and out of the inner corner of the eye.
Use the tiniest amount possible. If it feels wet or drippy, it is too much.
Leave it on for 20 to 30 minutes, or overnight if your skin tolerates it well.
Rinse in the morning with warm water and a gentle cleanser.

How to apply castor oil to your eyebrows

Start with clean, dry, product-free brows.
Dip a clean spoolie in a small amount of oil and wipe off the excess.
Brush through the brows in the direction of hair growth, root to tip.
Optionally, massage a very small amount into the skin beneath the brow.
Leave it on overnight.
Rinse in the morning.

How often, and what to expect

Once a day, ideally at night, is plenty. Consistency matters far more than quantity, and applying more oil or applying it more often will not speed anything up. There is no promised timeline here. Judge the routine on softer, shinier, less brittle hairs, not on new growth, since that is the outcome the technique can actually support.

Eye-area safety (read this part)

Patch test first. Apply a small amount to your inner arm and wait 24 hours before using it near your eyes. Some people are sensitive to ricinoleic acid, the main fatty acid in castor oil, and can develop redness or itching (Medical News Today).
Never let oil get into the eye itself. It can blur your vision and sting. If it happens, rinse with water and stop using it if irritation continues.
Use only a clean applicator. A dirty or reused wand can introduce bacteria and increase the risk of eye infection.
Less is more. Applying too much oil, especially overnight, can migrate into the skin around the eyes and cause puffiness or small bumps in some people (Healthline).
Do not use on lash extensions. Oil breaks down the adhesive bond and can cause extensions to lift or fall out early.
Stop and see a professional if you notice persistent irritation, a stye, or any other eye problem.

Castor oil is a simple, additive-free way to condition your lashes and brows, as long as you keep it clean, keep it minimal, and keep it out of your eye. Start with a quality oil. Brilho Brasileiro is 100% pure, cold-pressed, and additive-free, single-origin from Northeastern Brazil.