What Is Castor Oil Good For? Examining 8 Potential Uses

Known primarily for its FDA-approved use as a laxative, castor oil can also be applied to the skin and hair, though scientific evidence on its effectiveness in these areas remains limited. Before trying castor oil for its touted health benefits, consider potential side effects and discuss usage with your healthcare provider.

1. Castor Oil’s Laxative Benefits

The FDA approves castor oil as a stimulant laxative, often used to treat constipation or prepare the bowels for medical procedures. However, it may not be as effective as other options.

Ricinoleic acid gives castor oil its laxative effects. Once digested, castor oil breaks down into ricinoleic acid, which then stimulates the bowels.

Small studies suggest castor oil effectively cleanses the bowels for procedures like colonoscopies. Larger, randomized trials are needed to confirm its effectiveness.

2. Tips for Using Castor Oil on Hair and Skin 

While many claim benefits for the hair, here’s no strong evidence that castor oil stimulates hair growth.

Some people use castor oil on the scalp and hair to condition or treat dandruff and add shine. While it may improve hair luster, evidence is weak and inconclusive.

Some use castor oil for skin care, treating wrinkles and dryness. A 2017 study suggests it acts as an occlusive moisturizer, creating a barrier to lock in skin moisture.

However, while other plant oils have been well investigated for potential skin benefits, castor oil has not. Thus, any skin benefits of castor oil have yet to be scientifically proven.

3. Can Castor Oil Truly Induce Labor?

Many claim castor oil can induce labor. A 2024 hospital-based study supports this, showing it may soften the cervix to promote labor.

One observational, retrospective study looked at the use of castor oil to induce, or initiate, labor. The study took place over five years and included women between 40 and 41 weeks pregnant, which is full-term. Compared with the control group, the women who used castor oil showed a higher probability of going into labor within 24 hours.

Other studies, however, have not shown significant benefits with castor oil use.

4. Easing Arthritis Pain 

Castor oil may help relieve rheumatoid arthritis symptoms, as its anti-inflammatory properties could reduce pain.

5. Fighting Bacteria 

Castor oil has antibacterial properties that may help with wound healing. Its potassium salt seems to control infection and promote recovery.

In addition to caring for wounds, castor oil can be used to remove bacteria from material. Studies have specifically focused on its effectiveness in removing bacteria from dentures, ensuring better overall health for denture wearers.

6. A Possible Role in Removing Toxins

Some people think castor oil can remove body toxins, often using it topically by rubbing it on the stomach or applying a soaked cloth.

However, there is no scientific proof to support the claims of detox.

7. Castor Oil and Eye Health

There is a wide range of beliefs about castor oil for eye health, from claims that it can improve eyesight to those that it may even treat glaucoma.

Research explores castor oil’s potential for eye health, like treating blepharitis or dry eyes, but further studies are needed.

8. Can Castor Oil Help Treat Cancer?

Some people believe that castor oil can shrink tumors and help treat cancer, but research does not support these claims. In fact, castor oil may cause irritation on skin that is already sensitive from treatments like radiation or surgery.

Potential Side Effects of Castor Oil

Mild side effects have been reported with the use of castor oil. Typically, these and other side effects will subside once castor oil use stops.

Common side effects of castor oil may include nausea and diarrhea. One study discovered a rare condition called acute hair felting, where the hair became hard, twisted, and entangled after castor oil was used topically. These symptoms occurred following the use of castor oil for the first time by healthy individuals.

Signs of castor oil overdose, which warrants immediate medical attention, include:

• Abdominal cramps
• Chest pain
• Diarrhea
• Dizziness and fainting
• Hallucinations
• Nausea
• Shortness of breath
• Skin rash
• Throat tightness

Some of these are similar to the common side effects associated with castor oil, so it is important to take it exactly as directed. Talk with your healthcare provider about the right dose of castor oil for you.

Important Precautions

Castor oil may not be right for everyone, and there are a few precautions to take when using it.

It is recommended that people who are pregnant avoid using castor oil, as it could cause premature contractions.

There is not enough research to know if castor oil is safe for breastfeeding people. Because of this, you should consult your healthcare provider before using castor oil. Also, parents should consult their pediatrician before giving castor oil to children.

It’s possible to be allergic to the castor plant, as contact dermatitis has been reported in rare cases after using topical castor oil. Therefore, anyone allergic to castor oil should avoid using it.

How Much Castor Oil Should I Take?

Castor oil may be used orally or topically in varying amounts. Due to a lack of research, there are no official recommendations for the dosage of castor oil.

In adult males, an appropriate castor oil dose is 15 to 60 milliliters (mL) a day when used as a laxative. However, this range may not be suitable for everyone. You should follow dosage recommendations from your healthcare provider or as listed on the supplement label.

Taking too much castor oil may cause side effects, so it’s important to talk with your healthcare provider about the right dosage for you.

Interactions With Other Medications

Supplements may interact with various medications or other supplements. In the case of castor oil, drug or supplement interactions are not well-documented.

Aside from the lack of evidence, interactions with castor oil may still exist. You should discuss any potential interactions between castor oil and the medications or supplements you’re taking with your healthcare provider.

It is vital that you carefully read the ingredient list and nutrition facts panel of a supplement to know which ingredients and how much of each ingredient is included. Please review new supplement labels with your healthcare provider to discuss any potential interactions with foods, other supplements, and medications. 

Are There Similar Supplements?

Various supplements may work similarly to castor oil. However, it is typically recommended to avoid using multiple supplements for the same purpose at a time. Talk with your healthcare provider about which supplements are best for you.

Similar supplements to castor oil include:

• Black cohosh: Black cohosh has traditionally been used by midwives for natural labor induction, but more recent reports warn of risks and complications, including potential cancer risk identified in animal studies.
• Magnesium: Some magnesium supplements, like magnesium oxide, are thought to work like laxatives. After ingestion, magnesium helps pull water to the bowels, an important part of stool formation. It is often used as a laxative in the clinical setting due to its safety.
• Vitamin D: Vitamin D has been found to have many benefits for human health, including skin health.
• Boswellia: Also known as Indian frankincense, Boswellia has been used for the treatment of osteoarthritis. One systematic review looked at several studies and found Boswellia could relieve pain associated with osteoarthritis. The supplement was also found to be a safe option.

No supplement should replace standard medical care. Always seek medical guidance from a healthcare provider to discuss the right supplement choice.