Castor oil: benefits and uses (complete guide)
Castor oil is the richest plant oil for strengthening hair, coating lashes and brows, nourishing beards and reinforcing brittle nails. Use it neat as a targeted treatment (lashes, nails) or mixed with a lighter oil as a weekly hair oil bath: our organic castor oil is cold-pressed, 100% pure and COSMOS Organic certified by Ecocert.
Thick, glossy and almost odourless, castor oil is the favourite "strengthening" treatment of natural beauty routines. This guide covers everything you need to use it well, area by area, for stronger hair, fuller-looking lashes and less brittle nails.
Contents
- What is castor oil?
- What it does
- Castor oil for hair
- Castor oil for lashes and brows
- Castor oil for beards
- Castor oil for nails and skin
- Table: how and how often to use it
- Precautions
- Choosing a good castor oil
- FAQ
1. What is castor oil?
Castor oil is pressed from the seeds of the castor plant (Ricinus communis). Its INCI name is Ricinus Communis Seed Oil. It is very thick, pale yellow and exceptionally rich in ricinoleic acid (around 90% of its fatty acids), which gives it its coating, glossy finish.
Our castor oil comes from India. It is cold-pressed, 100% pure, bottled in France by an ESAT (a sheltered-employment workshop) in glass bottles (50, 100 or 200 ml) and keeps for 12 months after opening.
→ Discover our organic castor oil: cold-pressed, 100% pure, COSMOS Organic certified by Ecocert.
2. What castor oil does
- Strengthens: it coats hair, lashes and nails and limits breakage.
- Deeply nourishes: its rich texture protects very dry areas (ends, cuticles, elbows, heels).
- Repairs the look of damaged ends: lengths feel softer and less rough.
- Adds shine: hair, brows and beards look glossier from the first uses.
3. Castor oil for hair
This is its star use: a weekly oil bath leaves hair stronger, shinier and less prone to breakage.
- Mix 1 tablespoon of castor oil with 1 tablespoon of a lighter oil (organic jojoba oil or organic argan oil).
- Massage into the scalp with your fingertips, then comb through the lengths.
- Leave on for 1 to 2 hours, or overnight under a towel.
- Wash twice with a mild shampoo.
With regular use, hair looks thicker and shinier after 4 to 8 weeks. Read more in our guide to castor oil for hair and our comparison castor oil or avocado oil for dry hair. The Stronger Hair Pack (castor, black seed, jojoba) brings together the three oils of this ritual.
4. Castor oil for lashes and brows
Applied in the evening with a clean spoolie, it coats lashes and tames brows: your eyes look more defined.
- Remove all make-up.
- Apply a tiny amount at the roots, never inside the eye.
- Rinse with lukewarm water in the morning.
Every step is explained in our article on castor oil for lashes and brows.
5. Castor oil for beards
A few drops mixed with jojoba oil nourish the skin under the beard, soften the hair and give it a fuller, glossier look. Massage into beard and skin 3 to 4 times a week. Our beard pack is ready to give.
→ Castor, jojoba or argan: compare the oils and follow the 5-step ritual in our guide beard oil: which one to choose.
6. Castor oil for nails and skin
Massaged into nails and cuticles every evening, it nourishes, softens and strengthens soft or brittle nails. On skin, it protects very dry areas (elbows, heels, hands). Avoid it on oily, breakout-prone skin as it can clog pores. See our evening cuticle and nail ritual and the cuticle and nail pack.
7. How and how often to use it
| Area | How | How often |
|---|---|---|
| Hair | Oil bath, mixed 50/50 with a lighter oil | Once a week |
| Lashes and brows | Neat, with a spoolie, in the evening | 3 to 4 evenings a week |
| Beard | A few drops mixed with jojoba | 3 to 4 times a week |
| Nails and cuticles | Neat, massaged in | Every evening for 3 weeks |
| Very dry skin | Mixed with sweet almond oil | As needed |
8. Precautions
- Do a patch test in the crook of your elbow 24 hours before first use.
- Use small amounts: too much oil weighs hair down and is hard to rinse out.
- Keep away from the inside of the eye.
- For external use only. During pregnancy and for children, ask a health professional first.
9. Choosing a good castor oil
Choose a castor oil that is organic, cold-pressed, 100% pure, additive-free and sold in glass. That is exactly our organic castor oil: COSMOS Organic certified by Ecocert, from a Cosmebio-labelled brand, bottled in France by an ESAT. Build your routine: 10% off from 2 oils, 15% off from 3 oils in your basket.
10. FAQ
What is castor oil used for?
It strengthens hair and adds shine, coats lashes and brows, nourishes beards, strengthens brittle nails and protects very dry skin.
Can I use castor oil every day?
On lashes, brows and nails, yes, in very small amounts. On hair, one oil bath a week is enough.
How long before I see results?
Shine shows from the first uses; stronger hair and fuller-looking lashes after 4 to 8 weeks of regular use.
Neat or mixed?
Neat for lashes, brows and nails; mixed with a lighter oil (jojoba, argan, sweet almond) for hair, beard and body.
How long does castor oil keep?
Our castor oil keeps for 12 months after opening, away from heat and light.
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