Drug & supplement interaction

Boron + Warfarin

Warfarin brand name: Warfarin.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Boron and Warfarin in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Boron and Warfarin

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Warfarin and Boron in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

Worth understanding: our licensed dataset holds no drug-interaction record for Boron at all — not against Warfarin, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Boron safety at a glance

Boron overall Use caution Generally safe in small amounts from food and low-dose supplements, but high doses can be toxic.
Pregnancy Likely Safe When used orally and appropriately. Boron is safe in amounts that do not exceed the UL during pregnancy or lactation, which is 20 mg daily in those 19-50 years... Read the full pregnancy detail
Breastfeeding Likely Safe When used orally and appropriately. Boron is safe in amounts that do not exceed the UL during pregnancy or lactation, which is 20 mg daily in those 19-50 years... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Warfarin and Boron? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Boron and Warfarin May Share Several of the Same Side Effects

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • Hair loss Additional detail

    Boron

    “Orally, chronic use of 1 gram daily of boric acid or 25 grams daily of boric tartrate can cause dermatitis and alopecia.

    Larger doses can result in acute poisoning. Symptoms of poisoning in adults and children may include skin erythema, desquamation, and exfoliation (17).”

    Boron · Natural Medicines adverse-effect record, reported in alopecia.

    2 sources cited
    1. 7135. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
    2. 17. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.

    Warfarin

    Listed in the ADVERSE REACTIONS section of the FDA label for Warfarin. Read the label on DailyMed ›

  • Diarrhea / Vomiting / Nausea Additional detail

    Boron

    “Orally, chronic use of 1 gram daily of boric acid or 25 grams daily of boric tartrate can cause anorexia and indigestion.

    Larger doses can result in acute poisoning. Children who have ingested 5 grams or more of borates can have persistent nausea, vomiting, and diarrhea leading to acute dehydration, shock, and coma.”

    Boron · Natural Medicines adverse-effect record, reported in anorexia.

    2 sources cited
    1. 7135. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
    2. 17. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.

    Warfarin

    Listed in the ADVERSE REACTIONS section of the FDA label for Warfarin. Read the label on DailyMed ›

  • A skin rash Additional detail

    Boron

    “Orally, boron is generally well tolerated when used in doses below the tolerable upper intake level (UL) of 20 mg. Vaginally, boron is well tolerated.

    Most Common Adverse Effects:

    Orally: Anorexia, dermatitis, erythema, indigestion.

    Vaginally: Burning and pain.”

    Boron · Natural Medicines adverse-effect record, reported in anorexia.

    Warfarin

    Listed in the ADVERSE REACTIONS section of the FDA label for Warfarin. Read the label on DailyMed ›

Reported for Boron but not commonly for Warfarin: cough, mood changes or irritability, stomach upset and seizures.

Effects for Warfarin come from the ADVERSE REACTIONS section of its FDA label; effects for Boron come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Boron in Pregnancy & Breastfeeding

Pregnancy And Lactation Likely Safe

When used orally and appropriately. Boron is safe in amounts that do not exceed the UL during pregnancy or lactation, which is 20 mg daily in those 19-50 years of age or 17 mg daily for those 14-18 years of age.

Pregnancy And Lactation Possibly Unsafe

When used orally in doses exceeding the UL. Higher doses might impair growth and cause adverse effects in the developing fetus. ...when used vaginally. Intravaginal boric acid has been associated with a 2.7- to 2.8-fold increased risk of birth defects when used during the first 4 months of pregnancy.

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

From our Q&A

Questions About Boron or Warfarin

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Boron or Warfarin, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Warfarin

This page covers Boron only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Warfarin page lists 361 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Alfalfa (major), American Ginseng (major), Beer (major) and Cannabis (major).

By severity: 16 major · 301 moderate · 44 minor.

From our pharmacist’s overview on the Warfarin page

“People take warfarin to prevent dangerous clots, and many are the same people reaching for glucosamine for sore joints or a multivitamin containing vitamin K, which makes this a list that deserves genuine respect. Of the 361 supplements on file for warfarin, 16 carry a major rating, and the danger runs in both directions: some add to w…”

Reviewed by 2 · Jul 18, 2026

Open the Warfarin interaction page

One more smart check

Taking Boron as Part of a Dietary Supplement Product? Check It for Interactions

We hold 8,984 real supplement products containing Boron, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Boron. Even though Boron itself has no known interaction with Warfarin, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Boron and Warfarin Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Boron
Top 5%

#29 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Warfarin
Top 10

#4 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Boron reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Boron and Warfarin records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Boron

What is Boron?

Boron
  • Bone health
  • Joint and arthritis support
  • Hormone (testosterone/estrogen) support
  • Cognitive function
  • Menstrual discomfort

Boron is a trace mineral found in many plant foods and sold as a supplement, mainly promoted for bone, joint, and hormone health. The human evidence for most of these uses is limited or preliminary, and most people get enough boron from a normal diet. It appears generally safe in low amounts, but high doses can be toxic, so check with your pharmacist or doctor before using it.

Trace mineral (not a plant part) · Capsules, tablets, liquids; forms include boron citrate, boron glycinate, boron aspartate, and sodium borate

An interaction check asks whether these two react with each other — it does not ask whether Boron is a good idea for someone in your situation. Here is what our Boron record says about it on its own.

Boron: dosing

There is no official recommended dietary allowance (RDA) for boron, and a standardized supplement dose has not been firmly established. Most people already get boron from foods like fruits, vegetables, nuts, and legumes.Supplements are usually sold in small milligram amounts. Health authorities have set a safe upper limit for adults, and you should not exceed it.

From our Boron monograph — the full record covers uses, side effects and every documented interaction.

Read the full Boron monograph & all interactions
Medication

About Warfarin

What Is Warfarin Used For?

Brand name: Warfarin

Warfarin sodium tablets and Jantoven tablets are both used to prevent and treat venous thrombosis (blood clots in the veins) and pulmonary embolism (a clot in the lungs). They are also used to prevent clot-related complications in people with atrial fibrillation (an irregular heart rhythm) or who have had a heart valve replaced.

In people who have had a heart attack, warfarin is used to reduce the risk of death, another heart attack, stroke, or other clotting events. It does not dissolve an existing clot, but it helps prevent the clot from growing and stops new dangerous clots from forming.

See full Warfarin drug information
Keep checking

Other Drugs & Boron

Browse every other medication we’ve checked against Boron — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Boron against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Boron list.

See the full Boron interactions page
See every supplement checked against Warfarin, ranked by severity
Evidence & sources

Boron References

The 6 references that drive our Boron 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. Ellenhorn MJ, et al. Ellenhorn's Medical Toxicology: Diagnoses and Treatment of Human Poisoning. 2nd ed. Baltimore, MD: Williams & Wilkins, 1997.
  2. Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
  3. Thai L, Hart LL. Boric acid vaginal suppositories. Ann Pharmacother 1993;27:1355-7.
  4. Acs N, Banhidy F, Puho E, Czeizel AE. Teratogenic effects of vaginal boric acid treatment during pregnancy. Int J Gynaecol Obstet 2006;93:55-6. PubMed
  5. Garabrant, D. H., Bernstein, L., Peters, J. M., and Smith, T. J. Respiratory and eye irritation from boron oxide and boric acid dusts. J Occup Med 1984;26(8):584-586. PubMed
  6. Hjelm C, Harari F, Vahter M. Pre- and postnatal environmental boron exposure and infant growth: results from a mother-child cohort in northern Argentina. Environ Res 2019;171:60-8. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Boron and Warfarin Together: Common Questions

Is it safe to take Boron with Warfarin?
We do not list a known interaction between Boron and Warfarin. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Boron and Warfarin have any of the same side effects?
Yes — our sources link each of them separately to 5 of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Does Warfarin interact with any supplements?
Yes. Warfarin has documented interactions with 361 supplements in our database — Boron is not one of them. The Warfarin interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Boron monograph Uses, safety profile, and every drug interaction in one place Warfarin drug information The full plain-English guide to this medication Warfarin supplement interactions Every supplement checked against Warfarin, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 6 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Warfarin and Boron?

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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.