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Description
What Castor Oil Is
Castor oil is pressed from the seed of Ricinus communis and is roughly 90% ricinoleic acid, a fatty acid almost no other oil carries in quantity. Our bottle is 4 oz of 100% pure oil with 1 ingredient, no carrier oils and no fragrance.
That single-ingredient framing matters here more than usual, because castor oil is sold for at least 6 different purposes and only 1 of them has solid human evidence behind it.
Composition: About 90% ricinoleic acid.
Texture: Noticeably thicker than almond or coconut oil.
Uses: Topical on skin and hair, or swallowed as a laxative.
Size: 4 oz, which covers roughly 8 to 12 abdominal packs.
The full claim-by-claim breakdown is in our castor oil overview.
What the Evidence Actually Covers
We would rather set expectations honestly than imply more than exists. Here is every major claim with the human evidence behind it.
Claimed use
Human evidence
Verdict
Laxative for constipation
Long-established recognised use
Supported
Constipation symptoms from packs
1 small trial in care homes
Weak, symptom only
Labour induction
3 trials, 233 women, plus 1 later RCT
Clinician territory
Meibomian dry eye
1 crossover trial of a 2% formulation
Not this bottle
Hair growth
0 controlled trials
Unsupported
Liver detox or toxin removal
0 controlled trials
Unsupported
Rows 5 and 6 are where most castor oil marketing lives, and they are the rows with nothing in them. Each claim is graded in the hair evidence page.
The One Established Use
Castor oil is a recognised stimulant laxative, and the effect is fast and decisive rather than gentle. Ricinoleic acid acts on the intestinal wall, which speeds transit and draws fluid into the bowel.
Onset: Commonly 2 to 6 hours.
Duration of use: Short courses of days, not a 7-day-a-week habit.
Common complaint: Cramping, and nausea at larger amounts.
Not for: Pregnancy, suspected obstruction, or children.
How to use it sensibly, and what to try first, is set out in castor oil for constipation.
About Castor Oil Packs
Packs are the fastest-growing use of this oil and the least supported. The only pack trial we could find studied elderly care-home residents over 3 days.
Outcome measured
Result
Number of bowel movements
No change
Amount of stool
No change
Stool consistency score
Improved
Straining during defecation
Reduced
Feeling of incomplete evacuation
Reduced
The authors concluded packs may help control symptoms of constipation, which is narrower than the liver and detox claims made elsewhere.[1]An examination of the effect of castor oil packs on constipation in the elderly — Complementary Therapies in Clinical Practice (2011) View source What packs do and do not do is covered in our page on castor oil packs.
Using It on Skin and Hair
On skin this is a heavy occlusive, so it slows water loss and makes skin look smoother while it sits there. On hair it coats the shaft and reduces frizz, which is a cosmetic effect rather than growth.
Use
Suggested approach
Face
1 part castor to 3 parts lighter oil, at night
Dry heels and elbows
A thin neat layer under socks or sleeves
Scalp and lengths
Diluted, under 1 teaspoon, washed out the same day
Abdominal pack
2 to 3 tablespoons on folded cotton flannel
Eyes and lash line
Avoid; the eye study used a formulated 2% product
Shaft penetration has been demonstrated for coconut oil rather than castor,[2]Secondary ion mass spectrometric investigation of penetration of coconut and mineral oils into human hair fibers — Journal of Cosmetic Science (2001) View source so the "feeds the follicle" claim is a transfer from a different oil. Skin use is detailed in castor oil for skin and face.
Safety, Allergy, and Who Should Avoid It
Castor oil is not hypoallergenic and it is not neutral in pregnancy. Both points are documented, and both are easy to work around once you know them.
Situation
What to do
Pregnancy
Avoid, including abdominal packs; it is studied as a labour agent
Known castor oil allergy
Avoid; reactions reported since 1983
Bowel obstruction, known or suspected
Never take a stimulant laxative
Inflammatory bowel disease in flare
Ask your team before any laxative
Children
Paediatric constipation is managed differently
Broken or inflamed skin
Do not occlude damaged skin
Allergic contact dermatitis to castor oil has appeared in the dermatology literature for decades,[3]Allergy to castor oil — Contact Dermatitis (1983) View source so patch-test on the inner forearm for 24 hours before facial use. The pregnancy line is explained in what the labour trials show, and the full list is in side effects and who should avoid it.
Why Choose Remedy's Castor Oil
One ingredient, a stated size, and no claims we cannot support. For an oil surrounded by this much marketing, that is the whole proposition.
What you get
Why it matters
100% pure castor oil
1 ingredient, so any reaction is traceable
4 oz bottle
Roughly 8 to 12 packs, or months of topical use
No fragrance or carrier oils
Nothing added that could irritate skin
Honest positioning
Sold for topical use and as a laxative, not as a detox
Frequently Asked Questions
What is castor oil mostly used for? +
Two routes dominate: topical use on skin and hair, and internal use as a stimulant laxative. Only the laxative use has established human evidence, and there are 0 controlled trials for hair growth.
Does castor oil pull toxins out of your body? +
No. Not 1 study has measured a toxin leaving the body during a pack. The single pack trial measured constipation symptoms and found no change in bowel movement counts.
Does castor oil contain ricin? +
No. Ricin is 1 protein that stays in the solid press cake left behind after pressing, and that cake is handled as an industrial by-product rather than bottled.
How long does castor oil take to work as a laxative? +
Commonly 2 to 6 hours, which is fast for a laxative. Most people take it in the morning for that reason, and follow the amount on the label rather than an online protocol.
Can I use it while pregnant? +
No, and this is the clearest avoid. The same oil has been trialled as a labour induction agent in 3 studies covering 233 women, so it is not a neutral substance in pregnancy.
Does castor oil grow hair? +
There are 0 controlled human trials, so there is no evidence base for yes. It coats the shaft and makes hair look thicker, which reverses the moment you wash it out.
Is it safe on the face? +
For most people, diluted 1 part in 3 and after a 24-hour patch test. It is a heavy occlusive, so acne-prone skin often does better with it below the neck.
How many packs does one bottle make? +
Roughly 8 to 12, since each pack uses about 2 to 3 tablespoons to saturate a folded cloth. Topical facial use makes a 4 oz bottle last months.
Can I put it in my eyes? +
No. The published eye trial used a formulated 2% homogenised ophthalmic preparation in 40 eyes under supervision, which is a different product from a cosmetic bottle.
Does it stain? +
Yes, and permanently on fabric. Use an old towel and bedding you do not mind marking, because castor oil is 1 of the harder oils to wash out.
Is cold-pressed or hexane-free better? +
Those describe extraction rather than strength, and 0 trials compare them for any outcome. They are reasonable preferences, not a different product.
How should I store it? +
Cool, dark and closed. Replace a bottle older than 1 to 2 years, especially if the smell has turned sharp, since oils go rancid rather than simply losing strength.
You May Also Like
Raw Coconut Oil 16 oz — the oil with actual hair-shaft penetration data behind it
Almond Oil 4 oz — a much lighter carrier for everyday facial use
Senna 1000 mg — a stimulant laxative in capsule form, if that is the goal
Castor oil is pressed from the seed of Ricinus communis and is roughly 90% ricinoleic acid, a fatty acid almost no other oil carries in quantity. Our bottle is 4 oz of 100% pure oil with 1 ingredient, no carrier oils and no fragrance.
That single-ingredient framing matters here more than usual, because castor oil is sold for at least 6 different purposes and only 1 of them has solid human evidence behind it.
Composition: About 90% ricinoleic acid.
Texture: Noticeably thicker than almond or coconut oil.
Uses: Topical on skin and hair, or swallowed as a laxative.
Size: 4 oz, which covers roughly 8 to 12 abdominal packs.
The full claim-by-claim breakdown is in our castor oil overview.
What the Evidence Actually Covers
We would rather set expectations honestly than imply more than exists. Here is every major claim with the human evidence behind it.
Claimed use
Human evidence
Verdict
Laxative for constipation
Long-established recognised use
Supported
Constipation symptoms from packs
1 small trial in care homes
Weak, symptom only
Labour induction
3 trials, 233 women, plus 1 later RCT
Clinician territory
Meibomian dry eye
1 crossover trial of a 2% formulation
Not this bottle
Hair growth
0 controlled trials
Unsupported
Liver detox or toxin removal
0 controlled trials
Unsupported
Rows 5 and 6 are where most castor oil marketing lives, and they are the rows with nothing in them. Each claim is graded in the hair evidence page.
The One Established Use
Castor oil is a recognised stimulant laxative, and the effect is fast and decisive rather than gentle. Ricinoleic acid acts on the intestinal wall, which speeds transit and draws fluid into the bowel.
Onset: Commonly 2 to 6 hours.
Duration of use: Short courses of days, not a 7-day-a-week habit.
Common complaint: Cramping, and nausea at larger amounts.
Not for: Pregnancy, suspected obstruction, or children.
How to use it sensibly, and what to try first, is set out in castor oil for constipation.
About Castor Oil Packs
Packs are the fastest-growing use of this oil and the least supported. The only pack trial we could find studied elderly care-home residents over 3 days.
Outcome measured
Result
Number of bowel movements
No change
Amount of stool
No change
Stool consistency score
Improved
Straining during defecation
Reduced
Feeling of incomplete evacuation
Reduced
The authors concluded packs may help control symptoms of constipation, which is narrower than the liver and detox claims made elsewhere.[1]An examination of the effect of castor oil packs on constipation in the elderly — Complementary Therapies in Clinical Practice (2011) View source What packs do and do not do is covered in our page on castor oil packs.
Using It on Skin and Hair
On skin this is a heavy occlusive, so it slows water loss and makes skin look smoother while it sits there. On hair it coats the shaft and reduces frizz, which is a cosmetic effect rather than growth.
Use
Suggested approach
Face
1 part castor to 3 parts lighter oil, at night
Dry heels and elbows
A thin neat layer under socks or sleeves
Scalp and lengths
Diluted, under 1 teaspoon, washed out the same day
Abdominal pack
2 to 3 tablespoons on folded cotton flannel
Eyes and lash line
Avoid; the eye study used a formulated 2% product
Shaft penetration has been demonstrated for coconut oil rather than castor,[2]Secondary ion mass spectrometric investigation of penetration of coconut and mineral oils into human hair fibers — Journal of Cosmetic Science (2001) View source so the "feeds the follicle" claim is a transfer from a different oil. Skin use is detailed in castor oil for skin and face.
Safety, Allergy, and Who Should Avoid It
Castor oil is not hypoallergenic and it is not neutral in pregnancy. Both points are documented, and both are easy to work around once you know them.
Situation
What to do
Pregnancy
Avoid, including abdominal packs; it is studied as a labour agent
Known castor oil allergy
Avoid; reactions reported since 1983
Bowel obstruction, known or suspected
Never take a stimulant laxative
Inflammatory bowel disease in flare
Ask your team before any laxative
Children
Paediatric constipation is managed differently
Broken or inflamed skin
Do not occlude damaged skin
Allergic contact dermatitis to castor oil has appeared in the dermatology literature for decades,[3]Allergy to castor oil — Contact Dermatitis (1983) View source so patch-test on the inner forearm for 24 hours before facial use. The pregnancy line is explained in what the labour trials show, and the full list is in side effects and who should avoid it.
Why Choose Remedy's Castor Oil
One ingredient, a stated size, and no claims we cannot support. For an oil surrounded by this much marketing, that is the whole proposition.
What you get
Why it matters
100% pure castor oil
1 ingredient, so any reaction is traceable
4 oz bottle
Roughly 8 to 12 packs, or months of topical use
No fragrance or carrier oils
Nothing added that could irritate skin
Honest positioning
Sold for topical use and as a laxative, not as a detox
Frequently Asked Questions
What is castor oil mostly used for? +
Two routes dominate: topical use on skin and hair, and internal use as a stimulant laxative. Only the laxative use has established human evidence, and there are 0 controlled trials for hair growth.
Does castor oil pull toxins out of your body? +
No. Not 1 study has measured a toxin leaving the body during a pack. The single pack trial measured constipation symptoms and found no change in bowel movement counts.
Does castor oil contain ricin? +
No. Ricin is 1 protein that stays in the solid press cake left behind after pressing, and that cake is handled as an industrial by-product rather than bottled.
How long does castor oil take to work as a laxative? +
Commonly 2 to 6 hours, which is fast for a laxative. Most people take it in the morning for that reason, and follow the amount on the label rather than an online protocol.
Can I use it while pregnant? +
No, and this is the clearest avoid. The same oil has been trialled as a labour induction agent in 3 studies covering 233 women, so it is not a neutral substance in pregnancy.
Does castor oil grow hair? +
There are 0 controlled human trials, so there is no evidence base for yes. It coats the shaft and makes hair look thicker, which reverses the moment you wash it out.
Is it safe on the face? +
For most people, diluted 1 part in 3 and after a 24-hour patch test. It is a heavy occlusive, so acne-prone skin often does better with it below the neck.
How many packs does one bottle make? +
Roughly 8 to 12, since each pack uses about 2 to 3 tablespoons to saturate a folded cloth. Topical facial use makes a 4 oz bottle last months.
Can I put it in my eyes? +
No. The published eye trial used a formulated 2% homogenised ophthalmic preparation in 40 eyes under supervision, which is a different product from a cosmetic bottle.
Does it stain? +
Yes, and permanently on fabric. Use an old towel and bedding you do not mind marking, because castor oil is 1 of the harder oils to wash out.
Is cold-pressed or hexane-free better? +
Those describe extraction rather than strength, and 0 trials compare them for any outcome. They are reasonable preferences, not a different product.
How should I store it? +
Cool, dark and closed. Replace a bottle older than 1 to 2 years, especially if the smell has turned sharp, since oils go rancid rather than simply losing strength.
You May Also Like
Raw Coconut Oil 16 oz — the oil with actual hair-shaft penetration data behind it
Almond Oil 4 oz — a much lighter carrier for everyday facial use
Senna 1000 mg — a stimulant laxative in capsule form, if that is the goal
