Herb & supplement monograph

Beta-sitosterol Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by ·Updated July 2026
What is this page for?

First and foremost: how Beta-sitosterol interacts with medications. The heart of this page is the interaction list — every drug Beta-sitosterol is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Beta-sitosterol is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Beta-sitosterol

0 medications have a known interaction with Beta-sitosterol, graded by severity. Select any drug for the full evidence-based detail.

We don’t currently list any known drug interactions for Beta-sitosterol. This doesn’t guarantee none exist — always confirm with your pharmacist before combining supplements with your medications.

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

  • Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
  • Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
  • Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
  • No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

  • Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
  • Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
  • Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

  • Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
  • Each drug listed above links to the full report for that exact Beta-sitosterol combination — clinical detail, likelihood, evidence level, and citations.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Monograph

Beta-sitosterol: Uses, Safety & Side Effects

Medically reviewed by · Reviewed July 2026 ·
The bottom line

Beta-sitosterol is a plant sterol that may modestly lower LDL ('bad') cholesterol and may help ease urinary symptoms from an enlarged prostate. Evidence is moderate for these uses and weaker for others, and it is generally well tolerated, but you should talk with your pharmacist or doctor before starting it.

Part used
Plant sterol found in seeds, nuts, vegetable oils, and many plants
Common forms
Capsules, tablets, softgels, and fortified foods
People commonly use it for
  • High cholesterol
  • Enlarged prostate (BPH)
  • Heart health
  • Immune support
  • Hair loss

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance
OverallUse caution

Generally well tolerated for most adults when used short-term, but check with a healthcare provider first.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail
BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Beta-sitosterol is a natural compound called a plant sterol (or phytosterol). It has a structure similar to cholesterol, but it comes from plants rather than animals.

It is found naturally in many foods, including vegetable oils, nuts, seeds, avocados, and whole grains. As a supplement, beta-sitosterol is often pulled from sources like soybeans, pine trees, or other plants and sold in capsules or tablets.

People most often take beta-sitosterol to help lower cholesterol or to ease urinary symptoms linked to an enlarged prostate. It is also added to certain margarines and other foods marketed as 'heart healthy.'

How it works

Because beta-sitosterol looks a lot like cholesterol, it can compete with cholesterol in your digestive tract. This is thought to reduce how much cholesterol your body absorbs from food, which can lower blood cholesterol levels.

For prostate symptoms, the exact mechanism is not fully understood. Researchers believe it may affect inflammation or certain enzymes and hormone pathways, but much of this is based on laboratory and animal research rather than solid human proof.

Some lab studies also suggest beta-sitosterol may have antioxidant or immune-related effects, but these findings are early and do not yet show clear benefits in people.

Effectiveness

Does Beta-sitosterol work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by .

Evidence overview · 20 uses evaluated
1 Likely effective 2 Possibly effective 17 Insufficient evidence
How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.
2Likely EffectiveGood evidence, though not yet conclusive.
3Possibly EffectiveSome evidence suggests a benefit.
4Possibly IneffectiveSome evidence it may not help.
5Likely IneffectiveFairly strong evidence it doesn’t help.
6IneffectiveStrong evidence it doesn’t work.
7Insufficient Reliable Evidence to RateToo little research to say either way.
Likely Effective Benign prostatic hyperplasia (BPH)
Rating & evidence shown verbatim from Natural Medicines

Oral beta-sitosterol is beneficial for most symptoms of BPH.

Possibly Effective Coronary heart disease (CHD)
Rating & evidence shown verbatim from Natural Medicines

The US Food and Drug Administration (FDA) has approved an authorized health claim for dietary plant sterols, when taken in doses of at least 3.4 grams daily as part of a diet low in saturated fat and cholesterol, for reducing the risk of CHD.

Possibly Effective Familial hypercholesterolemia
Rating & evidence shown verbatim from Natural Medicines

Oral beta-sitosterol, in combination with a cholesterol-lowering diet, seems to reduce low-density lipoprotein (LDL) cholesterol levels in patients with familial hypercholesterolemia. However, it doesn't seem to work as well as sitostanol or bezafibrate.

Also studied for 17 conditions — evidence insufficient to rate
Insufficient Reliable Evidence To Rate Allergic rhinitis (hay fever)
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for allergic rhinitis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Androgenic alopecia
Rating & evidence shown verbatim from Natural Medicines

Oral beta-sitosterol has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Asthma
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for asthma, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Burns
Rating & evidence shown verbatim from Natural Medicines

Topical beta-sitosterol has only been evaluated in combination with other ingredients; its effect when used alone is unclear.

Insufficient Reliable Evidence To Rate Chronic prostatitis and chronic pelvic pain syndrome (CP/CPPS)
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for prostatitis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Esophageal cancer
Rating & evidence shown verbatim from Natural Medicines

It is unclear if dietary beta-sitosterol intake influences the outcome of esophageal cancer.

Insufficient Reliable Evidence To Rate HIV/AIDS
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for HIV/AIDS, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Menopausal symptoms
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for menopausal symptoms, there is insufficient reliable information about the clinical effects of beta-sitosterol for this purpose.

Insufficient Reliable Evidence To Rate Migraine headache
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for migraine headache, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Obesity
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral beta-sitosterol is beneficial for obesity.

Insufficient Reliable Evidence To Rate Psoriasis
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for psoriasis, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Rheumatoid arthritis (RA)
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral beta-sitosterol is beneficial for RA.

Insufficient Reliable Evidence To Rate Systemic lupus erythematosus (SLE)
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for SLE, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Thrombocytopenia
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for thrombocytopenia, there is insufficient reliable information about the clinical effects of beta-sitosterol for this condition.

Insufficient Reliable Evidence To Rate Tuberculosis
Rating & evidence shown verbatim from Natural Medicines

It is unclear if oral beta-sitosterol is beneficial for tuberculosis.

Insufficient Reliable Evidence To Rate Upper respiratory tract infection (URTI)
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using oral beta-sitosterol for upper respiratory infections such as bronchitis, common cold, exercise-induced respiratory infections, and influenza, there is insufficient reliable information about the clinical effects of beta-sitosterol for these conditions.

Insufficient Reliable Evidence To Rate Wound healing
Rating & evidence shown verbatim from Natural Medicines

Although there is interest in using topical beta-sitosterol for wound healing, there is insufficient reliable information about the clinical effects of beta-sitosterol for this purpose.

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

Beta-sitosterol is generally considered well tolerated for most adults when taken by mouth for short periods. Still, you should talk with your pharmacist or doctor before starting it, especially if you have a medical condition or take other medicines.

People with a rare inherited condition called sitosterolemia (where the body absorbs too much plant sterol) should not take beta-sitosterol supplements, as it could worsen their condition.

Pregnancy and breastfeeding: There is not enough reliable safety information for supplemental beta-sitosterol during pregnancy or breastfeeding. To be safe, it is best to avoid supplements during these times unless your doctor specifically advises otherwise.

If you are using beta-sitosterol for prostate symptoms, remember that urinary problems can have serious causes. See a doctor for a proper diagnosis rather than self-treating.

Side effects

Beta-sitosterol is usually well tolerated. When side effects happen, they are most often mild and digestive in nature.

  • Nausea or upset stomach
  • Gas or bloating
  • Diarrhea or constipation
  • Indigestion

Some men have reported problems such as reduced sexual desire or erectile difficulty, but this is uncommon. Serious side effects are rare. If you notice an allergic reaction or any unusual or severe symptoms, stop taking it and seek medical care.

Beta-sitosterol: Reported Adverse Effects

Documented safety reports on Beta-sitosterol from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Orally, beta-sitosterol is generally well tolerated. Topically, beta-sitosterol seems to be well tolerated.

Most Common Adverse Effects:

Orally: Constipation, diarrhea, gas, indigestion, and nausea.

Reports by condition
Acne Dermatologic

Orally, beta-sitosterol can worsen acne when taken alone or in combination with saw palmetto.

  1. Oster P, Schlierf G, Heuck CC, et al. [Sitosterol in familial hyperlipoproteinemia type II. A randomized, double-blind, cross-over study]. Dtsch Med Wochenschr 1976;101:1308-11.
  2. Prager N, Bickett K, French N, Marcovici G. A randomized, double-blind, placebo-controlled trial to determine the effectiveness of botanically derived inhibitors of 5-alpha-reductase in the treatment of androgenetic alopecia. J Altern Complement Med 2002
Constipation Gastrointestinal

Orally, beta-sitosterol can cause nausea, indigestion, gas, diarrhea, or constipation. Beta-sitosterol can also reduce the appetite. There is a case report of acute pancreatitis thought to be associated with taking beta-sitosterol in a 57-year-old male. Symptoms started the first day of use, but did not return when he stopped taking beta-sitosterol.

Single reports of reduced appetite, flatulence, and diarrhea have been reported for patients taking a combination of saw palmetto and beta-sitosterol.

  1. Berges RR, Windeler J, Trampisch HJ, et al. Randomised, placebo-controlled, double-blind clinical trial of beta-sitosterol in patients with benign prostatic hyperplasia. Beta-sitosterol Study Group. Lancet 1995;345:1529-32.
  2. Klippel KF, Hiltl DM, Schipp B. A multicentric, placebo-controlled, double-blind clinical trial of beta-sitosterol (phytosterol) for the treatment of benign prostatic hyperplasia. Br J Urol 1997;80:427-32.
  3. Becker M, Staab D, Von Bergman K. Long-term treatment of severe familial hypercholesterolemia in children: effect of sitosterol and bezafibrate. Pediatrics 1992;89:138-42.
  4. Lorenze A, Hsueh W, Nasr J. Beta-sitosterol-induced acute pancreatitis: A case report and review of the literature. Cureus. 2020;12(3):e7407.
  5. Prager N, Bickett K, French N, Marcovici G. A randomized, double-blind, placebo-controlled trial to determine the effectiveness of botanically derived inhibitors of 5-alpha-reductase in the treatment of androgenetic alopecia. J Altern Complement Med 2002
Erectile dysfunction (ED) Genitourinary

Orally, beta-sitosterol can cause erectile dysfunction and loss of libido.

  1. Berges RR, Windeler J, Trampisch HJ, et al. Randomised, placebo-controlled, double-blind clinical trial of beta-sitosterol in patients with benign prostatic hyperplasia. Beta-sitosterol Study Group. Lancet 1995;345:1529-32.
  2. Wilt TJ, MacDonald R, Ishani A. beta-sitosterol for the treatment of benign prostatic hyperplasia: a systematic review. BJU Int 1999;83:976-83.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no single official dose of beta-sitosterol for all uses. The amount used in studies varies depending on the condition being studied, and product strengths differ between brands.

The best approach is to follow the directions on the product label and not take more than recommended. If you are not sure how much to take or whether it is right for you, ask your pharmacist or doctor.

For cholesterol benefits, plant sterols are often taken with meals. For any use, give it time and check with a healthcare provider before combining it with other supplements or treatments.

Pregnancy & Breastfeeding

Beta-sitosterol & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using.

Beta-sitosterol & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; avoid using.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

© 2026 Therapeutic Research Center

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 7 references that drive our Beta-sitosterol monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Berges RR, Windeler J, Trampisch HJ, et al. Randomised, placebo-controlled, double-blind clinical trial of beta-sitosterol in patients with benign prostatic hyperplasia. Beta-sitosterol Study Group. Lancet 1995;345:1529-32.
  2. Klippel KF, Hiltl DM, Schipp B. A multicentric, placebo-controlled, double-blind clinical trial of beta-sitosterol (phytosterol) for the treatment of benign prostatic hyperplasia. Br J Urol 1997;80:427-32.
  3. Wilt TJ, MacDonald R, Ishani A. beta-sitosterol for the treatment of benign prostatic hyperplasia: a systematic review. BJU Int 1999;83:976-83. PubMed
  4. Oster P, Schlierf G, Heuck CC, et al. [Sitosterol in familial hyperlipoproteinemia type II. A randomized, double-blind, cross-over study]. Dtsch Med Wochenschr 1976;101:1308-11.
  5. Becker M, Staab D, Von Bergman K. Long-term treatment of severe familial hypercholesterolemia in children: effect of sitosterol and bezafibrate. Pediatrics 1992;89:138-42. DOI
  6. Prager N, Bickett K, French N, Marcovici G. A randomized, double-blind, placebo-controlled trial to determine the effectiveness of botanically derived inhibitors of 5-alpha-reductase in the treatment of androgenetic alopecia. J Altern Complement Med 2002
  7. Lorenze A, Hsueh W, Nasr J. Beta-sitosterol-induced acute pancreatitis: A case report and review of the literature. Cureus. 2020;12(3):e7407. PubMed
Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Brand directory

Brands that make products with Beta-sitosterol

239 brands in our database make a supplement containing Beta-sitosterol.

Product directory

Supplement products with Beta-sitosterol

709 products in our database contain Beta-sitosterol. Open any to see its full ingredient list and every drug interaction we check.

+Men Saw Palmetto Complex by Shaklee Softgel Capsule 60 Softgel(s) View ingredients & interactions +Stress Relief Stress Relief Complex by Shaklee Other (e.g. Tea Bag) 30 Caplet(s) View ingredients & interactions 100% Pure Stabilized Rice Bran by NutraBio Powder 600 Gram(s) · 21 oz. View ingredients & interactions 12 Hour X-Treme by BioXgenic Capsule 180 Liquid Capsule(s) View ingredients & interactions 4Life Transfer Factor Plus by 4Life Capsule 60 Capsule(s) View ingredients & interactions 4Life Transfer Factor Plus RiteStart Men by 4Life Unknown 30 Packet(s) View ingredients & interactions a Drenal by RLC Labs Capsule 120 Capsule(s) View ingredients & interactions A Man's Zinc by Vibrant Health Capsule 60 Vegetable Capsule(s) View ingredients & interactions A Man's Zinc by Vibrant Health Capsule 60 Vegetable Capsule(s) View ingredients & interactions Advanced Cholesterol Complex 800 mg by Health Thru Nutrition Capsule 90 Vegecap(s) View ingredients & interactions Advanced Cholesterol Complex 800 mg by Health Thru Nutrition Capsule 120 Vegecap(s) View ingredients & interactions Advanced Prostate Plus by DC Capsule 60 Vegetable Capsule(s) View ingredients & interactions Advanced Prostate Plus by DC Capsule 60 Vegetable Capsule(s) View ingredients & interactions Alka Slim by B.E.S.T. Process Alka-Line Supplements Powder 25.6 Ounce(s) · 725.75 Gram(s) View ingredients & interactions Alkadrenergy by B.E.S.T. Process Alka-Line Supplements Tablet Or Pill 90 Tablet(s) View ingredients & interactions Beauty Ceramides by Doctor's Best Softgel Capsule 60 Veggie Softgel(s) View ingredients & interactions Beta Sitosterol by Advance Physician Formulas Capsule 90 Vegetable Capsule(s) View ingredients & interactions Beta Sitosterol by DC Tablet Or Pill 90 Tablet(s) View ingredients & interactions Beta Sitosterol by The Vitamin Shoppe Tablet Or Pill 60 Tablet(s) View ingredients & interactions Beta Sitosterol by DC Tablet Or Pill 90 Tablet(s) View ingredients & interactions Beta Sitosterol by The Vitamin Shoppe Tablet Or Pill 120 Tablet(s) View ingredients & interactions Beta Sitosterol 180 mg by SuperSmart Capsule 90 Vegetarian Capsule(s) View ingredients & interactions Beta Sitosterol 800 mg by KRK Supplements Capsule 90 Capsule(s) View ingredients & interactions Beta Sitosterol Complex 667 mg by Wonder Laboratories Tablet Or Pill 100 Tablet(s) View ingredients & interactions
Pharmacist Counseling Corner

Beta-sitosterol: Common Questions

What is Beta-sitosterol used for, and does it work?
People use Beta-sitosterol for many reasons, but the evidence varies by use. According to the Natural Medicines database, there is at least some clinical evidence supporting Beta-sitosterol for Benign prostatic hyperplasia (BPH), Coronary heart disease (CHD) and Familial hypercholesterolemia. For most other uses it has been studied for, the evidence is currently insufficient to rate. See the graded list on this page, and always confirm with your pharmacist or doctor.
Does Beta-sitosterol interact with prescription medications?
We do not currently list any known drug interactions for Beta-sitosterol. This does not guarantee that none exist, so always confirm with your pharmacist before combining it with your medications.
How are Beta-sitosterol interactions rated?
Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.
Is it safe to take Beta-sitosterol with my medications?
It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.
Where does this Beta-sitosterol interaction information come from?
Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.
What is Beta-sitosterol used for?
People most commonly use it to help lower cholesterol and to ease urinary symptoms from an enlarged prostate. It is also promoted for immune support and hair loss, but the evidence for those uses is weaker.
Is Beta-sitosterol safe to take?
For most healthy adults, it is generally well tolerated when taken short-term and as directed. People with the inherited condition sitosterolemia should avoid it, and it is best to check with your pharmacist or doctor first.
Can Beta-sitosterol cure an enlarged prostate?
No. Some studies suggest it may improve urinary symptoms, but it does not appear to shrink the prostate or cure the condition. You should see a doctor for proper diagnosis and treatment.
Can I take Beta-sitosterol if I'm pregnant or breastfeeding?
There isn't enough safety data, so it's best to avoid supplemental Beta-sitosterol during pregnancy and breastfeeding unless your doctor specifically recommends it.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Keep exploring

Products that contain Beta-sitosterol

A rotating sample of real supplements in our database that list Beta-sitosterol — open any to see its full ingredients and every drug interaction we check.

See all 709 products with Beta-sitosterol →
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