Castor Oil (Ricino Oil) for Hair Growth: Benefits, Uses & How to Apply for Maximum Results

Castor oil, also known as Ricino oil, is extracted from the Castor bean plant (Ricinus communis). During processing, the highly toxic protein Ricin found within the Castor bean is removed, making the oil safe and beneficial for use in promoting hair growth.

In this article, you will learn how castor oil boosts hair growth, how to use it and expert tips to get the best out of your bottle. 

What is Castor Oil and Why is it Good for Hair Growth?

Castor oil is described as a thick, pale yellow liquid rich in ricinoleic acid, vitamin E, and Omega-6 and Omega-9 fatty acids, which boost circulation to the scalp, nourish hair follicles, and strengthen hair, thereby reducing hair breakage. 

What are the Benefits of Castor Oil for Hair?

1. Nourishes the scalp: Castor oil helps to improve blood circulation to the scalp and provides long-lasting hydration.

2. Fight inflammation: Castor oil is an anti-inflammatory agent that can help soothe dry, irritated and itchy scalps.

3. Antimicrobial effects: Castor oil has antifungal and antibacterial properties that help prevent infections and allow healthy growth. 

4. Promotes a thicker hair appearance: This treatment helps hair grow and prevents premature hair shedding. This can result in progressively thicker and fuller hair.

5. Prevents breakage and split ends: Castor oil improves hair elasticity, making it stronger and less susceptible to breakage and split ends. 

How To Use Castor Oil for Hair: A Step-by-Step Guide

Castor oil can be used in several ways depending on the desired effect. Due to its thick viscosity, castor oil adheres to hair and scalp surfaces, making it necessary to use a lighter carrier oil to aid in absorption and cleansing after use.
Coconut oil, olive oil, and jojoba oil are some of the best bases for diluting castor oil.

1. As a Scalp Soother: Apply the product to the scalp and gently massage it in. Leave it on for 30 minutes before rinsing thoroughly. 

2. As a hair mask: You can create your homemade hair mask using castor oil, coconut oil, honey, and essential oils such as rosemary or peppermint. 
Gently rub the solution onto your hair and scalp, and leave it in for 30-40 minutes. Then, rinse it out and wash thoroughly with a gentle shampoo. Repeat weekly for shinier, stronger, and more moisturised hair and skin. 

3. As a Leave-in Treatment: Apply castor oil to wet or dry hair to help nourish throughout the day and help minimise split ends.
Direct your attention to the ends of your hair while applying castor oil to help preserve the cuticle and minimise split ends.

4. As a styling aid: The thick nature of castor oil protects curls by creating a protective layer that blocks frizz and holds in moisture. This is a good solution for dry locks prone to breakage. 

5. Eyebrow and Eyelash Growth: Dip a cotton swab or a clean mascara brush into castor oil and gently massage onto your clean eyebrows or eyelashes at night to promote healthier, more robust hair. Remember to wash the solution off in the morning gently. 

Does Castor Oil Actually Promote Hair Growth? Scientific Evidence & Anecdotal Results

Castor oil’s medicinal and beauty properties have been utilised for centuries, with people using it for hair growth, scalp hydration, and anti-inflammatory purposes.

The ricinoleic acid within castor oil contains both anti-inflammatory and moisturising properties, which is thought to enhance scalp and hair health.

Word of mouth has suggested that castor oil is effective; however, there have been limited clinical studies on this substance.

What Do People Say About Castor Oil for Hair Growth?

The oil users have the following to say about the oil: 

• Regular scalp massages promote thicker, longer hair and have helped with hairline recession.
• Regular application to eyelashes and eyebrows helps to thicken and strengthen these areas.

While dermatologists have noted the benefits of castor oil, they also agree that more research is needed on it. Trichologists do not recommend its use despite numerous claims that it promotes hair growth.

“There is no scientific evidence showing that castor oil stimulates hair growth.”

“Castor oil has been shown in a study to increase hair lustre, but no studies show that castor oil directly causes hair growth. There are plenty of anecdotal stories, but there is no scientific evidence.” 

Hadley King, a board-certified dermatologist in New York City.

Ricinoleic acid in castor oil is beneficial in regrowing hair. Scientists should research to collect more data to support this statement.

Dr. Michele Green, a dermatologist.

“Castor oil is cost-effective if what you want is to give your hair some sheen, tame those flyaway hairs, and condition it.”

Courtney Foster, a hairstylist and certified trichologist.

Overall, the effectiveness of castor oil in promoting hair growth needs to be scientifically proven. 

Is Castor Oil Suitable for All Hair Types and Conditions?

Castor oil suits all hair types. However, there are different tips for each type of hair. 

Applying once a week provides sufficient protection against breakage and preserves shine without causing heaviness, making it suitable for those with moderately healthy hair to begin with. 

• Dry, damaged hair: Apply once to twice weekly. Start using the treatment once a week and continue every 3-4 days until the desired results are achieved. 

• Oily or fine hair: Apply only to the ends of hair every two weeks or less. Avoid applying oil directly to the hair roots, as it can cause excessive buildup on the scalp. 

Castor Oil (Ricino Oil) for Hair Growth FAQs

1. Can I leave castor oil in my hair overnight?

Yes, leaving castor oil on your scalp overnight is safe to do, and ensures that it reaches deep into the hair and scalp. Covering your hair with a cap can help prevent stains on your pillowcase and sheets.

2. Can I use castor oil on my hair every day?

Castor oil, even when diluted, is a thicker substance, and using it once or twice a week is usually sufficient. Applying it daily can result in a buildup and irritation. 

3. What’s the difference between regular and Jamaican black castor oil? 

Jamaican black castor oil is roasted before extraction, which gives it a dark colour and a smoky fragrance. Some believe it works better than regular castor oil, and it is commonly preferred by those with thicker or coarser hair types.

Should You Add Castor Oil to Your Hair Routine? 

Castor oil can be a beneficial addition to your hair care regimen if you know how to use it effectively. It can help support hair health and maintain scalp hydration; however, further scientific study is needed to confirm its impact on actual hair growth. 

With the proper regime in place and patient dedication to a treatment plan, you can find yourself on a journey to more lustrous locks.

You can read more about the best oils for hair growth on our page. 

Pro tip: Remember to perform a patch test before applying the product. Rub a tiny amount of the oil on the inside part of your forearm. 

Wait at least 24 hours to ensure there are no signs of irritation. 

If you’re exploring different types of hair oils and products that help with hair growth, you may find our other comprehensive blogs helpful in making your decision:

• Rosemary Oil for Hair Loss
• Evening Primrose Oil for Hair Loss: What You Need to Know
• Can Black Seed Oil Help Hair Growth?
• Does Caffeine Shampoo Work For Hair Loss?
• Do Hair Thickening Shampoos Work?
• Does Nizoral Shampoo Work For Hair Loss?