Castor oil has been a longtime staple in beauty routines, particularly among people looking for ways to moisturize dry skin or condition their hair. But the thick, plant derived oil has a history that extends well beyond beauty.

Made from the seeds of the Ricinus communis plant, castor oil contains a high concentration of ricinoleic acid, a fatty acid associated with many of its traditional uses. It is also recognized as a stimulant laxative for occasional constipation.

Despite its popularity, however, not every claim surrounding castor oil has been established through strong scientific research. Dermatologists have noted that evidence supporting some of its most talked about cosmetic benefits remains limited.

Here’s what to know before adding castor oil to your skin, hair or wellness routine.

What is castor oil?

Castor oil is produced by pressing the seeds of the castor plant. Compared with lighter oils such as argan or coconut oil, it has a noticeably thick and rich consistency.

That texture makes it useful as an occlusive moisturizer, meaning it can help reduce moisture loss from the skin and hair. It is often used on particularly dry areas, including chapped lips, rough hands, feet and dry hair ends.

Castor oil has also been used in traditional wellness practices for centuries. Its medicinal use today is more specific, with oral castor oil recognized as a laxative.

While laboratory and traditional uses have contributed to its reputation, evidence for many cosmetic claims remains limited. In particular, there is not enough research to establish castor oil as a proven treatment for hair growth, wrinkles or various skin conditions.

8 potential uses for castor oil

Castor oil’s thick consistency and fatty acid content may make it useful in several beauty applications.

1. Moisturizing dry skin: The oil can help soften areas that feel rough or dehydrated by creating a barrier that helps retain moisture.

2. Conditioning hair: Applied to the lengths and ends, castor oil may make hair feel smoother and more conditioned. It can be particularly useful for dry looking ends.

3. Supporting scalp moisture: Castor oil may help reduce the feeling of dryness on the scalp. However, it should not be considered a treatment for underlying scalp conditions such as fungal dandruff.

4. Caring for eyebrows and lashes: Castor oil is frequently used in DIY brow and lash routines. While it can condition the hairs, there isn’t strong evidence that it causes them to grow faster or thicker.

5. Adding shine: A small amount applied to hair can provide a glossy appearance while helping smooth the strands.

6. Supporting the skin barrier: Because it helps seal in moisture, castor oil may be useful when the skin feels especially dry or rough.

7. Occasional constipation relief: Taken orally, castor oil can stimulate the intestines and act as a laxative. This is one of its established medical uses.

8. Hair-end care: Applying a small amount to the ends may help make dry or frayed-looking hair appear more polished, although it cannot permanently repair split ends.

Topical use is different from taking it orally

How castor oil is used matters. Applying it to the skin or hair primarily provides a conditioning and moisturizing effect, while taking it by mouth produces a laxative effect.

Because oral use can cause significant digestive symptoms, it should not be treated like an everyday wellness supplement. Anyone considering it for constipation should follow product directions and consult a health professional when appropriate.

Potential side effects to know

Castor oil isn’t suitable for everyone. Topical application can cause irritation or an allergic skin reaction in some people, including redness, itching, swelling or a rash. Testing a small area first can help identify sensitivity.

People with acne-prone skin may also want to exercise caution because the oil’s richness may contribute to clogged pores for some individuals.

When taken orally, castor oil can cause cramping, diarrhea, nausea, vomiting, bloating or dizziness. Frequent use may also create problems with reliance on laxatives.

Pregnant people should not take castor oil without medical guidance because it can stimulate intestinal and uterine contractions.

How to use castor oil safely

For hair, start with a small amount and concentrate it on the ends or dry areas of the scalp. Because castor oil is especially thick, mixing a small amount with a lighter carrier oil can make it easier to distribute and rinse out.

For skin, a few drops can be applied to damp skin or mixed into an existing moisturizer. Avoid getting the oil directly into the eyes.

When using castor oil orally, follow the specific product instructions rather than assuming that a larger amount will provide better results. A pharmacist or health care professional can also help determine whether it is appropriate for occasional constipation.

The bottom line

Castor oil can be a useful addition to a beauty routine, particularly for moisturizing dry skin and conditioning hair. Its reputation for dramatically accelerating hair growth or treating specific skin concerns, however, is not backed by equally strong evidence.

Its established role as a laxative is better supported, but oral use can produce uncomfortable side effects and isn’t appropriate for everyone. For cosmetic use, starting with a small amount and watching for irritation is a sensible approach.