Castor Oil vs Coconut Oil for Hair Growth

A 2022 systematic review of coconut, castor, and argan oil in patients with skin of colour graded both oils in the same paper (Phong et al., 2022), and neither reached strong evidence for growth. Here is what each does, how they compare, and how to use them.

What makes hair grow?

Hair growth happens at the follicle, below the scalp. It needs steady blood flow, nutrients like protein, iron, and biotin, balanced hormones (excess DHT shrinks follicles and drives pattern hair loss), and low inflammation. Oils work on the scalp surface and hair shaft; they do not change hormones or nutrition.

What is castor oil?

Castor oil is a thick oil pressed from castor seeds, about 90% ricinoleic acid (reported in the 85 to 95% range). Ricinoleic acid carries a hydroxyl group, so its molecules hydrogen-bond to each other, making the oil unusually thick and keeping it largely on the surface of the strand rather than inside it.

The same review found weaker evidence for shine and no strong evidence for growth or lice; ricinoleic acid may help improve blood flow to the scalp surface, but there is no strong clinical evidence it directly increases hair growth rate.

Castor oil may support hair health through the following effects:

• Locks in moisture: an occlusive layer that holds moisture in and adds shine.

• Supports scalp hydration: helps reduce dryness-related flaking.

• Ricinoleic acid: may help improve blood flow to the scalp surface.

• Mild anti-inflammatory and antimicrobial support: helps calm a dry, flaky scalp; not tested for growth.

Best for: dry, tight scalps and thin-looking hair.

Not ideal for: oily scalps prone to seborrheic dermatitis, active fungal dandruff, or very fine hair.

Among castor oil benefits for hair, only shine and conditioning have review-level support; growth does not.

What is coconut oil?

Lauric acid, a medium-chain fatty acid, is small and straight enough to slip inside the shaft and bind to hair protein; castor oil's larger, kinked ricinoleic acid largely stays on the surface.

A 2003 lab study on hair tresses compared coconut, mineral, and sunflower oil. Coconut was the only one that reduced protein loss from damaged and undamaged hair (Rele & Mohile, 2003); mineral oil could not, and sunflower oil only coated the surface. However, it is important to note that the study was conducted by researchers at Marico Industries, an Indian manufacturer of coconut hair oil. 

Coconut oil supports hair strength through the following effects:

• Lauric acid: binds to hair protein.

• Penetrates the shaft: reduces protein loss and split ends.

• Lighter weight: easy to wash out as a pre-shampoo treatment.

Best for: hair that breaks easily, or dry hair before a wash.

Not ideal for: oily, acne-prone scalps, or coconut sensitivity.

The same review found that coconut oil has clinical support for brittle hair and lice, and limited evidence for growth. Among coconut oil benefits for hair, protecting weak strands has the strongest backing.

How do castor oil and coconut oil compare?

Castor oil vs coconut oil for hair growth comes down to texture, penetration and evidence strength:

Choosing castor oil or coconut oil for hair growth comes down to one question: conditioning and shine, or breakage protection? The right choice follows from the goal:

• Shine or softness: castor oil.

• Less breakage or damaged hair: coconut oil.

• Brittle hair or lice: coconut oil (2022 review).

• Regrowth or reversing hair loss: neither.

• Wanting both effects: mix the two. It improves spreadability and balances thickness with penetration.

The underlying cause still needs its own fix.

Does either oil regrow hair on bald spots?

No. Neither castor nor coconut oil regrows hair on bald or thinning areas caused by genetics. Both oils can still:

• Improve scalp comfort

• Reduce inflammation

• Minimise breakage

• Support healthier hair texture

Castor's evidence is shine, not growth; coconut's is less protein loss, not follicle stimulation. DHT shrinks the follicle from inside, past any surface oil.

How should you use each oil?

Castor oil

1. Mix 1 tablespoon castor oil with 1 tablespoon coconut oil.

2. Warm slightly for better spreadability.

3. Massage into the scalp for 5 to 10 minutes.

4. Leave for 1 to 2 hours.

5. Wash out with a mild shampoo.

Mixing castor oil and coconut oil is the default method above. Once a week is enough; more often causes buildup.

Coconut oil

1. Apply a small amount to the scalp and lengths.

2. Leave on 30 to 60 minutes before washing.

3. Focus on mid-lengths and ends if breakage is the concern.

Use coconut oil once or twice a week. 

How does Ayurveda match each oil to your scalp type?

• Dry, rough scalp (Vata): heavier oils like castor.

• Heat-related hair fall (Pitta): cooling oils like coconut.

• Oily, congested scalp (Kapha): lighter application and better cleansing.

These are traditional groupings, not clinical evidence.

What are the most common hair-oiling mistakes?

Five habits undo an oiling routine faster than anything else:

• Too much oil, or poor rinsing: weighs hair down and irritates the scalp.

• Overnight oil on an oily scalp: raises buildup risk.

• Oiling during a dandruff flare-up: worsens fungal overgrowth.

• Not securing long hair: it tangles easily.

• Ignoring internal triggers: hormonal and nutrient-deficiency hair fall needs its own treatment.

None of these touch an internal cause.

How long before you see results?

Results build gradually: softer hair in 1 to 2 weeks, less breakage by 3 to 4 weeks, a fuller look by 6 to 8 weeks, typical with regular use, not a trial result.

When should you see a dermatologist?

Five signs mean the cause is internal and needs a dermatologist, not another oiling round:

• Sudden, heavy shedding: more than usual, over days not weeks.

• A receding hairline: the hairline visibly moves back.

• Crown thinning: more scalp visible at the crown.

• Hair fall with irregular periods, weight change, or fatigue: may signal a hormonal, thyroid, or nutrition cause.

• Scalp pain, itching, or patches: needs diagnosis, not oil.

These need a dermatologist, not more oil.

What does each oil actually solve?

Both oils do a real job on the surface: castor conditions and adds shine, coconut protects the strand from breakage. Neither reaches what drives hair fall: genetics, hormones, nutrition gaps and scalp health. Traya works across hair science, Ayurveda and nutrition so those internal drivers are treated alongside the follicle. Take the Traya Hair Test to find the actual reason behind your hair loss.

Frequently asked questions

Should you use castor oil instead of coconut oil for hair growth?

Neither replaces the other; which oil is best for hair growth depends on your situation: coconut if your hair breaks easily, castor if your scalp feels tight and dry but strands are intact.

Will castor oil grow your hair faster?

Castor oil's coating can make hair look fuller and thicker, but there is no strong evidence it speeds up growth rate.

Which oil should you use for dandruff?

Neither oil treats fungal dandruff; heavy oiling can worsen it. Skip oiling while it is active, and see a dermatologist.

Can you use both oils regardless of your gender?

Yes; both suit men and women. The choice depends on scalp type, not gender.

References

The sources cited in this article are listed below:

1. Phong C, Lee V, Yale K, Sung C, Mesinkovska N. (2022). Coconut, Castor, and Argan Oil for Hair in Skin of Color Patients: A Systematic Review. Journal of Drugs in Dermatology, 21(7):751-757. DOI: 10.36849/JDD.6972

2. Rele AS, Mohile RB. (2003). Effect of mineral oil, sunflower oil, and coconut oil on prevention of hair damage. Journal of Cosmetic Science, 54(2):175-192.

Note: References include DOIs where available to help readers locate, verify, and access the original peer-reviewed research. Unlike standard URLs, DOIs provide a permanent link to the published article.

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