Castor Oil Safety: Swallowing, Constipation and Labor Claims Checked

Castor oil is a thick, pale oil pressed from the seeds of the castor plant. Most people meet it as a hair or skin oil. This guide is about the other way it is used: swallowed. In the medicine cabinet it is an old laxative. In pregnancy circles it is a famous "natural" way to start labor. Both uses deserve a careful look, because swallowing a strong laxative is very different from rubbing an oil on your skin. We also keep the castor seed (which holds a poison) apart from the oil. This page gives no amounts and no recipes. Hair claims are covered on castor oil packs and hair growth claims.

Read this first

• Swallowed castor oil is sold in the US as a stimulant laxative. An FDA-listed product label says to ask a doctor before use if you have belly pain, nausea or vomiting, and to ask a health professional if you are pregnant or breastfeeding. [16]
• Do not start labor with castor oil on your own. UK NICE guidance says the available evidence does not support castor oil for induction of labor, and the best-known Cochrane review found too little reliable evidence. Newer studies are mixed. Talk to your midwife or doctor. [1][2][5][10]
• Do not give castor oil to babies. A case series from Haiti linked castor oil teas given to newborns and young infants to serious illness, and five of eight babies died. [18]
• Castor seeds (beans) contain ricin, a poison. Castor oil used in cosmetics is described as free of ricin because ricin does not mix into the oil. [14][19]
• Laxatives used too often can cause dehydration and low potassium. Get urgent medical help for severe belly pain, blood in the stool, fainting, or a baby or child who is limp, vomiting or will not drink. [17]

What swallowed castor oil does

After you swallow it, gut enzymes break castor oil into glycerol and ricinoleic acid. [14] In mice, ricinoleic acid switched on a docking site called the EP3 receptor on smooth muscle in the gut and the uterus. Mice without that receptor did not get the laxative effect or the uterus contraction. [13] That is a mouse finding, but it fits why one swallowed oil can cause both diarrhea and cramps.

Labels describe it plainly. A US over-the-counter castor oil label lists it as a stimulant laxative for occasional constipation and says it generally works in 6 to 12 hours. [16] The NHS page on laxatives groups "stimulant" types as medicines that trigger the bowel muscles to push stool out. That NHS page does not mention castor oil, so we use it only for general laxative cautions. [17]

Swallowing, constipation and overuse

Proper evidence not found in the sources we read (we searched Europe PMC) for a randomized trial of swallowed castor oil for everyday constipation in otherwise healthy adults. Ask a pharmacist about better-studied options; see natural ingredients for constipation and digestion.

Labor induction: what the evidence says

This is the most confusing part, because different reviews give different answers. They did not all look at the same studies.

How to read this honestly. The gold-standard Cochrane review says the trials were too small to know. Newer pooled analyses and a few small trials point to castor oil starting labor more often than doing nothing, but many of the studies behind them are observational, small, or from single hospitals, and nobody has run a large, careful trial of safety for mothers and babies. A large 2026 hospital study found it a little slower than standard methods. None of this proves castor oil is safe in your pregnancy or that it works for you.

What guidelines say.

• NICE (UK, 2021 update): "Be aware that the available evidence does not support" herbal supplements, acupuncture, homeopathy, castor oil, hot baths, enemas or sexual intercourse for induction of labor. [2]


• A 2024 review in the American Journal of Obstetrics and Gynecology lists castor oil among "complementary" methods. It says that because there is little data on efficacy and safety, these methods are rarely used in hospitals. [3]


• ACOG's patient page on labor induction lists medicines and devices for ripening the cervix. It does not mention castor oil in the text we read, so we cannot report an ACOG position on it. [4]

Meconium, risks for the baby and why not do it yourself

Meconium is a baby's first dark stool. If a baby passes it before birth, the water can look green or brown ("meconium-stained fluid"). The Cochrane trials found no clear difference in meconium-stained fluid between castor oil and placebo, and the herbal review found none either, but the numbers were too small to rule out harm. [1][7] Nobody has shown that castor oil is safe for the baby in studies large enough to catch rare problems. [1][10]

Why talk to a midwife or doctor first:

• Nausea, cramping and diarrhea are expected after a strong laxative. [1]


• Women in the studies were generally being watched by clinicians, with checks on the baby's heart rate and labor progress. [8][10]


• Some situations make starting labor early unsafe at all (for example a baby lying sideways, or a placenta covering the cervix). ACOG lists such conditions. [4]


• Before the due date ("before term"), no source we read supports castor oil. The studies enrolled women near or past term, around 39 to 41 weeks or later. [8][9][12]


• If your pregnancy is overdue, your team has proven options, including a membrane sweep (NICE) and medicines. [2]

See aromatherapy for labor and childbirth for a different, comfort-focused topic.

Babies, children and breastfeeding

• Newborns and young babies: in a report from rural Haiti, eight infants (three newborns and five aged 15 to 30 days) became very ill after teas that contained castor oil, given in some cases to help pass meconium. Five died. The authors said such use should be stopped. [18] This is a case report, not a trial, but it is a serious warning.
• Children: the US label we read says not to use castor oil in children under 2 without consulting a doctor, and to keep it out of the reach of children. Directions for older children differ by age. [16] Ask a pediatrician before giving a child any laxative; see children and teens.
• Breastfeeding: the label and NHS both say to check with a health professional before using laxatives if you are breastfeeding. [16][17] We did not find a lactation reference we could read that describes castor oil in breast milk. See breastfeeding herbs and supplements.
• Skin oil on babies: that is a different question; see natural oils for baby skin and massage.

When doctors use castor oil

Castor oil also appears in medical settings, directed by clinicians. Please do not copy these at home.

• Before a colonoscopy: a retrospective study of 1,251 hospital inpatients found that a smaller bowel-prep volume combined with castor oil gave adequate cleansing in 83.2% versus 77.4% with the standard larger volume, with fewer adverse events. It was not a randomized trial. [21]
• Before colon capsule endoscopy (a swallowed camera): a meta-analysis of six studies found the capsule was passed out more often after castor oil (92% versus 73%), but cleanliness did not differ and the authors said randomized trials are needed. [22]

Castor oil packs

Castor oil packs are cloths soaked in oil and placed on the skin, usually the belly. In one small study in two rest homes in Turkey, packs did not change the number of bowel movements or amount of stool, but lowered scores for stool consistency and straining. The abstract describes monitoring before, during and after the packs and no comparison group. [23] A pack on the skin is not the same as swallowing the oil. A 2025 cosmetic safety panel concluded castor seed oil is safe as a cosmetic ingredient in the ways and amounts described in its assessment, which concerns skin products, not swallowing. [15] For allergy and patch tests see patch testing natural oils and butters.

Castor seeds, ricin and the oil

The castor plant's seeds (beans) contain ricin, a protein toxin. Ricin stops cells from making proteins. [19] A 2007 cosmetic safety report says castor oil does not contain ricin because ricin does not partition into the oil; cosmetic castor oil is made by cold pressing the seeds and clarifying with heat. [14] That is why oil from a regulated product is handled very differently from seeds.

Seeds are a poisoning risk. A report from Nepal described a 6-year-old boy with stomach and gut symptoms after eating castor seeds, treated with supportive care because there is no antidote. [20] A review of fatal cases describes a course from mild stomach symptoms to shock and organ failure. [19]

If anyone, especially a child, has chewed or swallowed castor seeds, call your local poison center at once. In the US, Poison Help is 1-800-222-1222; for other countries see poison help by country. Do not wait for symptoms. For collapse, seizures or trouble breathing, call your emergency number. See also plant and mushroom poisoning.

Emergency and warning signs

Call a doctor or urgent care (or emergency number if severe) for:

• severe or constant belly pain, vomiting that will not stop, or blood in the stool [16][17]
• signs of dehydration: dizziness or fainting, very dark urine, a baby with fewer wet diapers, dry mouth, or a very sleepy child [17]
• muscle weakness or an uneven heartbeat (possible low potassium) [17]
• swollen face or throat, hives or trouble breathing (allergic reaction) [17]
• any castor seed swallowed, or a baby or young child given castor oil
• in pregnancy: any worry about your baby, bleeding, leaking fluid or strong pain. Call your maternity unit or doctor rather than relying on a home remedy.

Related pages

• Castor oil
• Castor oil packs and hair growth claims
• Castor oil as a carrier oil
• Check before you use natural oils and butters
• Natural ingredients in pregnancy and breastfeeding
• Poisoning: urgent help