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Glossary Castor oil

vegetable oil from Ricinus communis seeds, used in hair care

Castor oil is a vegetable oil derived from the seeds of the castor bean plant, scientifically known as Ricinus communis. It is commonly used in cosmetics and hair care products due to its moisturizing and anti-inflammatory properties, and it is believed to promote hair growth and improve scalp health.

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learn Castor oil

a traditional, natural remedy touted for promoting scalp health and hair growth

Does castor oil make hair grow or is it just a myth? There is no published human trial showing castor oil grows hair. It can make hair look and feel better by reducing breakage and adding shine, which is easily mistaken for growth, and it is not approved anywhere as a hair loss treatment.
Castor oil: How do you use it without ending up with greasy hair for days? Use a pea-sized amount of warmed castor oil to avoid greasy hair.
Castor oil: Does it help restore lost hair or just strengthen existing hair? Castor oil primarily strengthens existing hair rather than restoring lost hair.
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Research

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research Waterborne polyurethanes from castor oil-based polyols for next generation of environmentally-friendly hair-styling agents

25 citations , May 2020 in “Progress in Organic Coatings”

This study found that bio-based waterborne polyurethanes derived from castor oil may offer effective hair-styling performance without skin irritation and appear to be safer for the environment compared to traditional hair sprays.

research “Castor Oil” – The culprit of acute hair felting

4 citations , January 2017 in “International journal of trichology”

This case study reports that sudden hair matting occurred in a patient after using coconut and castor oils on long hair, requiring the hair to be cut off due to irreversible felting.

research Coconut, Castor, and Argan Oil for Hair in Skin of Color Patients: A Systematic Review.

2 citations , July 2022 in “PubMed”

This study found that coconut oil clinically helps with brittle hair and hair infestation, while evidence for castor and argan oils improving hair growth or quality is weak.

research Physicochemical Characterization and Evaluation of Castor Oil (R. communis) for Hair Biocosmetics

2 citations , January 2019 in “American Journal of Applied Chemistry”

Castor oil is suitable for use in hair care products.

Hair Regrowth Oil: A Narrative Review of Published Evidence for Rosemary, Peppermint, Panax Ginseng, Castor, Argan, and Olive Oils

research Hair Regrowth Oil: A Narrative Review of the Published Evidence for Rosemary Oil, Peppermint Oil, Panax Ginseng, Castor Oil, Argan Oil, and Olive Oil

August 2026 in “Zenodo (CERN European Organization for Nuclear Research)”

This narrative literature review by Lustrao synthesizes existing research on six botanical ingredients used in Lustrao Hair Regrowth Oil, noting varying evidence levels with rosemary oil showing the clearest human clinical support for hair growth, particularly against minoxidil.

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Community Join

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community Castor oil

6 upvotes 10 years ago

The user experienced reduced hair shedding and less itching after using oral castor oil alongside finasteride and minoxidil. They suggest trying castor oil, though they acknowledge the improvements might be due to the other treatments.

community Castor oil: Dozens of photo reviews on Amazon! Why there is no studies about Castor Oil for hair loss?

4 upvotes 4 years ago

Castor oil is discussed for hair loss treatment, with interest in its effectiveness despite a lack of studies. Minoxidil, finasteride, and RU58841 are also mentioned as treatments.

community Anyone have any luck with castor oil or any other types of oils?

4 upvotes 5 years ago

Castor oil and peppermint oil may help with hair quality and regrowth but are not effective for male pattern baldness (MPB). Rosemary oil is also mentioned as a potential remedy.

community How does castor oil improve hair growth?

7 upvotes 6 years ago

Castor oil may help hair growth by targeting specific receptors and reducing certain scalp levels, with some users reporting thicker hair. Peppermint oil is suggested as an alternative to minoxidil, while opinions on the effectiveness of plant-based treatments for hair loss vary.

community Doubts about castor oil

5 upvotes 7 years ago

Castor oil's effectiveness for hair growth is debated, with concerns about its impact on skin health and prostaglandin levels. Some users suggest combining it with coconut oil and using it alongside finasteride for better results, while others recommend sticking to proven synthetic treatments.

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