Drug & supplement interaction

Cumin + Letrozole

Letrozole brand name: Femara.

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 Cumin and Letrozole 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

Cumin and Letrozole

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 Letrozole and Cumin 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.

Cumin safety at a glance

Cumin overall Generally safe Cumin used as a spice in food is generally safe for most people.
Pregnancy Use caution Food amounts are likely fine, but avoid medicinal or supplement doses due to limited safety data.
Breastfeeding Use caution Food amounts are likely fine, but there is not enough information on larger supplement doses.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Letrozole and Cumin? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Letrozole

Interactions in our licensed database are recorded against drug classes, not just single drug names. Letrozole is filed under 4 classifications — including aromatase inhibitors, cytochrome p450 2c19 (cyp2c19) inhibitors, cytochrome p450 3a4 (cyp3a4) substrates. Cumin has documented interactions with 3 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), antidiabetes drugs (moderate) and rifampin (rifadin) (moderate) — and none of Letrozole’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

Cumin Does Interact With Other Medications

Cumin has 211 moderate known drug interactions in our database — Letrozole isn’t one of them. If you take anything else, check it against the full list below.

Moderate 211 No known interaction 2,619 (incl. Letrozole)
Taking anything else?

Check Another of Your Medications Against Cumin

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

What to actually watch for

What Cumin Itself Has Been Linked To

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

  • A severe allergic reaction Worth acting on Additional detail

    “Orally, cumin may cause allergic reactions, including anaphylaxis, in sensitive individuals. One case report of anaphylaxis associated with cumin consumption has been reported.

    Topically, cumin may cause allergic contact dermatitis in sensitive individuals.”

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

    3 sources cited
    1. 46905. Boxer, M., Roberts, M., and Grammer, L. Cumin anaphylaxis: a case report. J.Allergy Clin.Immunol. 1997;99(5):722-723. PubMed
    2. 31341. Anliker, M. D., Borelli, S., and Wuthrich, B. Occupational protein contact dermatitis from spices in a butcher: a new presentation of the mugwort-spice syndrome. Contact Dermatitis 2002;46(2):72-74. PubMed
    3. 46902. Futrell, J. M. and Rietschel, R. L. Spice allergy evaluated by results of patch tests. Cutis 1993;52(5):288-290.
  • An allergic reaction Worth acting on Additional detail

    Recorded for Cumin in the same Natural Medicines adverse-effect record shown under A severe allergic reaction above.

  • Stomach upset Additional detail

    Recorded for Cumin in the same Natural Medicines adverse-effect record shown under A severe allergic reaction above.

  • A skin rash Additional detail

    Recorded for Cumin in the same Natural Medicines adverse-effect record shown under A severe allergic reaction above.

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

From our Q&A

Questions About Cumin or Letrozole

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

This page covers Cumin only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Letrozole page lists 142 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), St. John's Wort (major), 7-methoxyflavone (moderate) and Acacia Rigidula (moderate).

By severity: 3 major · 99 moderate · 40 minor.

From our pharmacist’s overview on the Letrozole page

“Letrozole (Femara) is prescribed to keep hormone-driven breast cancer from returning, so a supplement that shifts its blood level can quietly undercut treatment. Give this list of 142 ingredients genuine respect, and learn the three major entries first.”

Reviewed by 2 · Jul 18, 2026

Open the Letrozole interaction page

One more smart check

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

We hold 279 real supplement products containing Cumin, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Cumin. Even though Cumin itself has no known interaction with Letrozole, 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 Cumin and Letrozole 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 Cumin
Top 25%

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

29 days ago today
Medication Letrozole
Top 5%

#51 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 Cumin reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Cumin and Letrozole 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 Cumin

What is Cumin?

Cumin
  • Digestive upset
  • Bloating and gas
  • Appetite stimulation
  • Blood sugar support
  • Cholesterol support
  • Antimicrobial

Cumin is a common cooking spice that has a long history in traditional medicine for digestion and other complaints. Food amounts are generally safe for most people, but the evidence for medicinal or supplement-level benefits is limited and mostly early-stage. Talk with your pharmacist or doctor before using concentrated cumin supplements or oil.

Cuminum cyminum · Apiaceae · Seeds (fruit) and essential oil · Whole seeds, ground powder, capsules, extracts, and essential oil

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

Cumin: dosing

There is no well-established standardized medicinal dose for cumin. As a spice, it is used freely in cooking, which is considered safe for most people.For supplements, extracts, or essential oil, follow the directions on the product label and do not exceed the recommended amount.

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

Read the full Cumin monograph & all interactions
Medication

About Letrozole

What Is Letrozole Used For?

Brand name: Femara

Letrozole (brand name Femara) is used to treat breast cancer in postmenopausal women whose tumors are driven by estrogen. It is used in three settings: as adjuvant (after-surgery) treatment for hormone receptor positive early breast cancer; as extended adjuvant treatment for women who have already completed about five years of tamoxifen therapy; and as first- or second-line treatment for locally advanced or metastatic (spread) breast cancer.

Femara is specifically indicated for first-line treatment of hormone receptor positive or receptor-unknown locally advanced or metastatic breast cancer, and for advanced breast cancer in women whose disease has progressed after antiestrogen therapy.

See full Letrozole drug information
Keep checking

Other Drugs & Cumin

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

0Major
211Moderate
0Minor
2,618No known interaction
211 Moderate 2,618 No interaction
Moderate

211 interactions

Showing 60 of 211 moderate interactions — see all 211 on the Cumin page.

No interaction 2,618 drugs checked — show the list

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

Showing the 60 most looked-up of 2,618 medications checked with no known interaction — see the full Cumin list.

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

Cumin References

The 10 references that drive our Cumin 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. Brinker F. Herb Contraindications and Drug Interactions. 2nd ed. Sandy, OR: Eclectic Medical Publications, 1998.
  2. Anliker, M. D., Borelli, S., and Wuthrich, B. Occupational protein contact dermatitis from spices in a butcher: a new presentation of the mugwort-spice syndrome. Contact Dermatitis 2002;46(2):72-74. PubMed
  3. Dhandapani, S., Subramanian, V. R., Rajagopal, S., and Namasivayam, N. Hypolipidemic effect of Cuminum cyminum L. on alloxan-induced diabetic rats. Pharmacol.Res 2002;46(3):251-255. PubMed
  4. Sachin, B. S., Sharma, S. C., Sethi, S., Tasduq, S. A., Tikoo, M. K., Tikoo, A. K., Satti, N. K., Gupta, B. D., Suri, K. A., Johri, R. K., and Qazi, G. N. Herbal modulation of drug bioavailability: enhancement of rifampicin levels in plasma by herbal pro
  5. Jagtap, A. G. and Patil, P. B. Antihyperglycemic activity and inhibition of advanced glycation end product formation by Cuminum cyminum in streptozotocin induced diabetic rats. Food Chem.Toxicol. 5-6-2010; PubMed
  6. Srivastava, K. C. Extracts from two frequently consumed spices--cumin (Cuminum cyminum) and turmeric (Curcuma longa)--inhibit platelet aggregation and alter eicosanoid biosynthesis in human blood platelets. Prostaglandins Leukot.Essent.Fatty Acids 1989;3 PubMed
  7. Futrell, J. M. and Rietschel, R. L. Spice allergy evaluated by results of patch tests. Cutis 1993;52(5):288-290.
  8. Boxer, M., Roberts, M., and Grammer, L. Cumin anaphylaxis: a case report. J.Allergy Clin.Immunol. 1997;99(5):722-723. PubMed
  9. Karimian J, Farrokhzad A, Jalili C. The effect of cumin (Cuminum cyminum L.) supplementation on glycemic indices: A systematic review and meta-analysis of randomized controlled trials. Phytother Res 2021;35(8):4127-4135.
  10. Tavakoli-Rouzbehani OM, Faghfouri AH, Anbari M, et al. The effects of Cuminum cyminum on glycemic parameters: a systematic review and meta-analysis of controlled clinical trials. J Ethnopharmacol 2021;281:114510. 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 Cumin and Letrozole Together: Common Questions

Is it safe to take Cumin with Letrozole?
We do not list a known interaction between Cumin and Letrozole. 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.
How was the Cumin and Letrozole combination checked?
Interactions in our licensed database are recorded against drug classes. Letrozole is filed under 4 classifications, and Cumin has documented interactions with 3 drug classes — none of Letrozole'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 Cumin interact with any other medications?
Yes. Cumin has 211 documented drug interactions in our database — Letrozole 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 Letrozole interact with any supplements?
Yes. Letrozole has documented interactions with 142 supplements in our database — Cumin is not one of them. The Letrozole 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

Cumin monograph Uses, safety profile, and every drug interaction in one place Letrozole drug information The full plain-English guide to this medication Letrozole supplement interactions Every supplement checked against Letrozole, 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 10 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Letrozole and Cumin?

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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.