Drug & supplement interaction

Rosemary + Valsartan

Valsartan brand names: Diovan, Prexxartan.

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 Rosemary and Valsartan 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.

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Interaction report

Rosemary and Valsartan

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 Valsartan and Rosemary 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.

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.

Rosemary safety at a glance

Rosemary overall Generally safe Safe in normal culinary amounts; concentrated extracts and undiluted essential oil require caution.
Pregnancy Possibly Unsafe When used orally in medicinal amounts. Rosemary might have uterine and menstrual flow stimulant effects, and might increase metabolism of estradiol and estrone;... Read the full pregnancy detail
Breastfeeding Use caution Food amounts are likely fine, but there is not enough safety data on medicinal doses, so avoid them.

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 Valsartan and Rosemary? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Valsartan

Interactions in our licensed database are recorded against drug classes, not just single drug names. Valsartan is filed under 4 classifications — including angiotensin receptor blockers (arbs), cytochrome p450 2c9 (cyp2c9) substrates, antihypertensive drugs. Rosemary has documented interactions with 6 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), antidiabetes drugs (moderate) and aspirin (moderate) — and none of Valsartan’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Rosemary Does Interact With Other Medications

Rosemary has 212 moderate, 160 minor known drug interactions in our database — Valsartan isn’t one of them. If you take anything else, check it against the full list below.

Moderate 212 Minor 160 No known interaction 2,458 (incl. Valsartan)
Taking anything else?

Check Another of Your Medications Against Rosemary

Covers the 2,830 medications we’ve checked against Rosemary. Pick one to open its full report.

What to actually watch for

What Rosemary Itself Has Been Linked To

This is not an interaction — nothing below involves Valsartan. It is the side-effect record for Rosemary on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Rosemary, this list is the first place to look. 2 entries are worth acting on rather than waiting out — marked below.

  • Wheezing / An allergic reaction Worth acting on Additional detail

    “Topically, allergic reactions can occur. When used in the mouth, lip and gum edema have occurred. When used on the skin, allergic contact dermatitis has occurred, likely due to the constituent carnosol.

    Rosemary might also cause occupational asthma. A case of occupational asthma caused by several aromatic herbs including thyme, rosemary, bay leaf, and garlic has been reported.”

    Rosemary · Natural Medicines adverse-effect record, reported in asthma.

    2 sources cited
    1. 101173. Valones MAA, Silva ICG, Gueiros LAM, Leão JC, Caldas AF Jr, Carvalho AAT. Clinical assessment of rosemary-based toothpaste (Rosmarinus officinalis Linn.): A randomized controlled double-blind study. Braz Dent J. 2019;30(2):146-151. PubMed
    2. 783. Cartier LC, Lehrer A, Malo JL. Occupational asthma caused by aromatic herbs. Allergy 1996;51:647-9. DOI
  • Seizures Worth acting on Additional detail

    “Orally, the undiluted oil, as well as the camphor constituent of rosemary, might cause seizures (4,5,6,12868).”

    Rosemary · Natural Medicines adverse-effect record, reported in epilepsy.

    4 sources cited
    1. 4. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
    2. 5. Foster S, Tyler VE. Tyler's Honest Herbal: A Sensible Guide to the Use of Herbs and Related Remedies. 3rd ed., Binghamton, NY: Haworth Herbal Press, 1993.
    3. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
    4. 12868. Burkhard PR, Burkhardt K, Haenggeli CA, Landis T. Plant-induced seizures: reappearance of an old problem. J Neurol 1999;246:667-70. PubMed
  • Sun sensitivity Additional detail

    “Topically, rosemary use can lead to photosensitivity, erythema, dermatitis, and cheilitis in hypersensitive individuals (4,6).”

    Rosemary · Natural Medicines adverse-effect record, reported in dermatitis.

    2 sources cited
    1. 4. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
    2. 6. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  • Swelling Additional detail

    Recorded for Rosemary in the same Natural Medicines adverse-effect record shown under Wheezing / An allergic reaction above.

  • A skin rash Additional detail

    Recorded for Rosemary in the same Natural Medicines adverse-effect record shown under Wheezing / An allergic reaction above.

Everything above comes from the Natural Medicines adverse-effect record for Rosemary — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Valsartan’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Valsartan column appears here.

Special populations

Rosemary in Pregnancy & Breastfeeding

Pregnancy Possibly Unsafe

When used orally in medicinal amounts. Rosemary might have uterine and menstrual flow stimulant effects, and might increase metabolism of estradiol and estrone; avoid using. There is insufficient reliable information available about the safety of rosemary when used topically during 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

Overlapping uses

What Valsartan Is Prescribed For, and What Rosemary Has Been Studied For

These two come up together because they touch the same health topic — not because they do the same job. Valsartan is a prescription medicine with approved uses on its FDA label. Rosemary is a supplement: what follows is what researchers have looked at it for, and how strong that evidence is.

Valsartan is prescribed for: Valsartan is used to treat high blood pressure (hypertension) in adults and children, heart failure in adults, and to lower the risk of cardiovascular death in adults who have had a heart attack and have reduced heart function. Lowering blood pressure reduces the risk of stroke and heart attack. Diovan (valsartan) tablets are approved to treat high blood pressure in children as young as 1 year old. Valsartan tablets (generic) are approved for children 6 years and older.

Read the rest of what Valsartan is prescribed for

Valsartan oral solution is specifically indicated for patients with heart failure or post-heart attack left ventricular dysfunction who are unable to swallow tablets.

Rosemary has been studied for:

  • Hypertension studied, not established Rosemary has been studied for this. Natural Medicines rates the evidence: Insufficient Reliable Evidence To Rate Read what the research shows

    Rosemary for hypertension

    Although there is interest in using oral rosemary for hypertension, there is insufficient reliable information about the clinical effects of rosemary for this condition.

Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Valsartan on your own; if you are taking Rosemary for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.

From our Q&A

Questions About Rosemary or Valsartan

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Rosemary or Valsartan, 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 Valsartan

This page covers Rosemary only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Valsartan page lists 182 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), American Hellebore (major), American Mistletoe (major), Tyramine (major) and Adrafinil (moderate).

By severity: 4 major · 145 moderate · 33 minor.

From our pharmacist’s overview on the Valsartan page

“Of the 182 supplements and herbs on file for valsartan (Diovan), a medication for high blood pressure and heart failure, most either deepen its blood-pressure-lowering effect or work against it, and the four rated major deserve genuine respect before the rest of the page. Activated charcoal can cut the absorption of oral doses, and the…”

Reviewed by 2 · Jul 18, 2026

Open the Valsartan interaction page

One more smart check

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

We hold 1,786 real supplement products containing Rosemary, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Rosemary. Even though Rosemary itself has no known interaction with Valsartan, 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 Rosemary and Valsartan 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 Rosemary
Top 25%

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

29 days ago today
Medication Valsartan
Top 5%

#109 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 Rosemary reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Rosemary and Valsartan records this page draws on were last updated July 11, 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 Rosemary

What is Rosemary?

Rosemary
  • Memory and concentration
  • Digestive upset
  • Hair growth
  • Anxiety and stress (aromatherapy)
  • Muscle and joint discomfort
  • Antioxidant support

Rosemary is a fragrant Mediterranean herb that is safe and flavorful in normal food amounts. Some early research suggests possible benefits for memory, mood, and hair growth, but the evidence is limited and far from conclusive. Concentrated supplements and the essential oil should be used carefully, and the essential oil should never be swallowed.

Rosmarinus officinalis · Lamiaceae · Leaves and essential oil · Culinary herb, tea, capsules, dried leaf extract, essential oil (for aromatherapy and topical use)

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

Rosemary: dosing

There is no well-established standardized dose for rosemary as a supplement. Amounts used in studies have varied widely depending on the form (tea, extract, or aromatherapy).If you use a rosemary supplement, follow the directions on the product label and do not exceed the recommended amount.

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

Read the full Rosemary monograph & all interactions
Medication

About Valsartan

What Is Valsartan Used For?

Brand names: Diovan, Prexxartan

Valsartan is used to treat high blood pressure (hypertension) in adults and children, heart failure in adults, and to lower the risk of cardiovascular death in adults who have had a heart attack and have reduced heart function. Lowering blood pressure reduces the risk of stroke and heart attack.

Diovan (valsartan) tablets are approved to treat high blood pressure in children as young as 1 year old. Valsartan tablets (generic) are approved for children 6 years and older. Valsartan oral solution is specifically indicated for patients with heart failure or post-heart attack left ventricular dysfunction who are unable to swallow tablets.

See full Valsartan drug information
Keep checking

Other Drugs & Rosemary

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

0Major
212Moderate
160Minor
2,457No known interaction
212 Moderate 160 Minor 2,457 No interaction
Moderate

212 interactions

Showing 60 of 212 moderate interactions — see all 212 on the Rosemary page.

Minor

160 interactions

Showing 60 of 160 minor interactions — see all 160 on the Rosemary page.

No interaction 2,457 drugs checked — show the list

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

Showing the 60 most looked-up of 2,457 medications checked with no known interaction — see the full Rosemary list.

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

Rosemary References

The 20 references that drive our Rosemary 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. Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
  2. Foster S, Tyler VE. Tyler's Honest Herbal: A Sensible Guide to the Use of Herbs and Related Remedies. 3rd ed., Binghamton, NY: Haworth Herbal Press, 1993.
  3. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  4. McGuffin M, Hobbs C, Upton R, Goldberg A, eds. American Herbal Products Association's Botanical Safety Handbook. Boca Raton, FL: CRC Press, LLC 1997.
  5. Gruenwald J, Brendler T, Jaenicke C. PDR for Herbal Medicines. 1st ed. Montvale, NJ: Medical Economics Company, Inc., 1998.
  6. Cartier LC, Lehrer A, Malo JL. Occupational asthma caused by aromatic herbs. Allergy 1996;51:647-9. DOI
  7. Burkhard PR, Burkhardt K, Haenggeli CA, Landis T. Plant-induced seizures: reappearance of an old problem. J Neurol 1999;246:667-70. PubMed
  8. Swain AR, Dutton SP, Truswell AS. Salicylates in foods. J Am Diet.Assoc 1985;85(8):950-60. DOI
  9. Zhu BT, Loder DP, Cai MX, et al. Dietary administration of an extract from rosemary leaves enhances the liver microsomal metabolism of endogenous estrogens and decreases their uterotropic action in CD-1 mice. Carcinogenesis 1998;19(10):1821-7. PubMed
  10. Debersac P, Heydel JM, Amiot MJ, et al. Induction of cytochrome P450 and/or detoxication enzymes by various extracts of rosemary: description of specific patterns. Food Chem Toxicol 2001;39(9):907-18. PubMed
  11. Debersac P, Vernevaut MF, Amiot MJ, et al. Effects of a water-soluble extract of rosemary and its purified component rosmarinic acid on xenobiotic-metabolizing enzymes in rat liver. Food Chem Toxicol 2001;39(2):109-17. PubMed
  12. Lee JJ, Jin YR, Lee JH, et al. Antiplatelet activity of carnosic acid, a phenolic diterpene from Rosmarinus officinalis. Planta Med 2007;73(2):121-7.
  13. Yamamoto J, Yamada K, Naemura A, et al. Testing various herbs for antithrombotic effect. Nutrition 2005;21(5):580-7. PubMed
  14. Naemura A, Ura M, Yamashita T, et al. Long-term intake of rosemary and common thyme herbs inhibits experimental thrombosis without prolongation of bleeding time. Thromb Res 2008;122(4):517-22. PubMed
  15. Lee JJ, Jin YR, Lim Y, et al. Antiplatelet activity of carnosol is mediated by the inhibition of TXA2 receptor and cytosolic calcium mobilization. Vascul Pharmacol 2006;45:148-53. 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 Rosemary and Valsartan Together: Common Questions

Is it safe to take Rosemary with Valsartan?
We do not list a known interaction between Rosemary and Valsartan. 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.
Are Rosemary and Valsartan used for the same thing?
They overlap in purpose, which usually means the real question is whether you need both rather than whether they are safe together. This page lists the shared uses and how strong the evidence is for Rosemary in each. That is a conversation for your prescriber, especially if Valsartan is being adjusted to a target.
How was the Rosemary and Valsartan combination checked?
Interactions in our licensed database are recorded against drug classes. Valsartan is filed under 4 classifications, and Rosemary has documented interactions with 6 drug classes — none of Valsartan's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Rosemary interact with any other medications?
Yes. Rosemary has 372 documented drug interactions in our database — Valsartan is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Valsartan interact with any supplements?
Yes. Valsartan has documented interactions with 182 supplements in our database — Rosemary is not one of them. The Valsartan 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

Rosemary monograph Uses, safety profile, and every drug interaction in one place Valsartan drug information The full plain-English guide to this medication Valsartan supplement interactions Every supplement checked against Valsartan, 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 20 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Valsartan and Rosemary?

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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.