Castor oil vs. rosemary oil for hair growth… which is best for you?

short-haired woman thinking how to grow her hair

  • Rosemary oil should be diluted with other ingredients before for hair growth, while castor oil can be applied directly.  Therefore, you can opt for castor oil if you’re short on time for your hair beauty routine.
  • Rosemary oil is only applied to the scalp, while castor oil is used to the entire hair.  Therefore, if you need to promote hair growth and repair your hair, you can opt for castor oil.
  • Rosemary oil contains carnosic acid instead of castor oil, which contains ricinoleic acid. Carnosic acid acts directly on the hair follicle. If your hair is fine, I recommend rosemary oil. Ricinoleic acid, in turn, helps retain moisture and keeps the scalp healthy and clean. So, it promotes hair growth more indirectly than rosemary oil.
  • Rosemary oil thickens new hair, unlike castor oil which prevents breakage. Therefore, if, in addition to promoting hair growth, you want to thicken your hair, I advise you to choose rosemary oil.


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Now you know the   basic differences between castor oil and rosemary oil and how they promote hair growth.  


woman looks at containers of castor oil and rosemary oil

As a colorist, I assure you that rosemary and castor oil are the most recommended oils for hair growth.

What will we find if we closely examine the differences between the two oils?

Have you read the explanation above? What can you infer?


I’ll help you figure it out.

  •   If you want to promote hair growth and have rosemary and castor oils at home, mix them.   Rosemary oil will improve your hair follicles to generate new strong, healthy, and thicker hair, while castor oil will moisturize the lengths and ends.
  •   If you currently have only castor oil and your hair is weak and brittle, use it to stop breakage and improve scalp blood circulation.   It’ll stimulate your hair growth.
  •   However, if you only have rosemary oil in your home, you’ll have to get another oil to dilute it.   You shouldn’t use pure rosemary oil. Therefore, in this case, I recommend you dilute it with castor oil.


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Use castor oil to stimulate hair growth and repair damaged hair

seeds and castor oil for hair growth

  The biggest advantage of using castor oil for hair growth is that you won’t have to dilute it with any other ingredients.  


Also, it can be applied to the scalp to improve blood circulation and the health of the hair follicles, and on the lengths and ends to moisturize and nourish them.

What are the benefits of castor oil for hair growth?

  • It retains moisture in your hair fiber. Therefore,   it stops breakage, and your hair will be longer.  
  • It promotes the production of keratin, which is a protein necessary for healthy hair.
  • It has antibacterial and anti-inflammatory properties. Therefore,   it helps control dandruff and prevent hair loss.  
  • It stimulates blood flow to the scalp to promote hair growth.


  If you want to improve your scalp health so that your hair grows stronger and healthier,   apply fifteen drops of castor oil twice a week to your scalp. Massage gently for five minutes and leave it on for at least fifteen minutes.

Rinse off the castor oil with shampoo and conditioner.   You can also use it as a mask once a week. 


To use rosemary oil for hair growth, you should dilute it with castor oil or another oil

rosemary oil plant and container

This is super important.   You shouldn’t use pure rosemary oil on your hair. Instead, dilute it with other ingredients like coconut oil or even your shampoo.  


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If you don’t dilute it, you’ll damage the hair follicles, and your hair won’t grow.

So, since we’re talking about rosemary and castor oil,   how about a mask mixing both oils to promote your hair growth, keep your scalp clean and healthy, and repair all your hair?  

What benefits will you get if you mix them?


  • Thanks to castor oil, you’ll maintain the length of your hair and stimulate growth with rosemary oil.
  • Your hair will be thicker due to the castor oil, and the rosemary oil will thicken new hair.
  • You’ll avoid dandruff because both oils prevent the production of bacteria on the scalp.

woman applies mixture of castor oil and rosemary for hair growth

However, I won’t fool you even if things look very easy.

As a professional stylist, I recommend that   you ask a dermatologist before using rosemary oil diluted with castor oil.  


You’ll find different concentrations of castor oil on the market. However, the dermatologist will advise you on the best concentration for you.

Dermatologists recommend starting with the least concentrated rosemary oil, and evaluating the results every four weeks.

The smallest concentration of rosemary oil is 1%.

Once your dermatologist recommends the concentration of rosemary oil to use, dilute it with castor oil.

  • Mix 9 drops of 1% rosemary oil with 2 tablespoons of castor oil.
  • Mix 18 drops of 2% rosemary oil with 2 tablespoons of castor oil.
  • Mix 27 drops of 3% rosemary oil with 2 tablespoons of castor oil.
  • Mix 36 drops of 4% rosemary oil with 2 tablespoons of castor oil.


How to apply it?

  •   Apply the blend to damp hair   to distribute it along your hair.
  • Massage your scalp with your fingertips and leave the oils for two hours. You can cover your hair with a shower cap.
  • After exposure, wash your hair with shampoo, and don’t use conditioner.
  • Use this mask up to twice a week.



Before using rosemary and castor oil to promote hair growth, I recommend you visit your dermatologist.

Although the oils are natural products, other pathologies could cause slow hair growth related to your scalp health.

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