Medication interaction hub

What Supplements Interact with Rituximab?

Rituximab brand name: Rituxan. Every interaction below applies to the brands too.

53 Interactions 52 Moderate 1 Minor
Curated & coded by · Clinical Pharmacist · Updated September 22, 2026

Drug–supplement interaction data sourced from Natural Medicines Pro, the licensed clinical database from TRC Healthcare / Therapeutic Research, with additional analysis by the HelloPharmacist Pharmacist Team. Our sources · Editorial policy

What is this page for?

One answer, for one medication: what supplements and herbal products interact with Rituximab? Every vitamin, herb, and supplement ingredient we’ve checked against it is on this page, ranked by severity, each linking to the full report for that exact pair.

This page covers supplement interactions only — to check Rituximab against your other medications, use the drug–drug interaction checker. Educational information from our licensed clinical databases, not medical advice. Our editorial policy

HelloPharmacist Bottom Line
Our Pharmacist Explains
What is this? The interaction data in the HelloPharmacist supplement database is licensed from Natural Medicines Pro by TRC Healthcare (Therapeutic Research). HelloPharmacist pharmacists often add our own analysis and context on top of that licensed data — such as this Bottom Line summary and the notes on individual interaction pages — and any such commentary is noted as ours.

Rituximab (Rituxan) works by knocking down part of the immune system, clearing out the B cells that drive lymphomas, leukemias, and autoimmune diseases like rheumatoid arthritis. All 53 supplements here interact the same way, showing some evidence of stimulating immune activity that could in theory blunt what the drug is trying to do. None rate as major, so for most patients this is a watch list rather than a reason to clear the shelf, but echinacea stands out because it is exactly what people reach for when a cold hits mid treatment.

Fifty-two entries are moderate and one is minor, and nearly all the evidence is theoretical, drawn from lab and animal studies rather than documented treatment failures. Still, when the drug's entire job is holding immune activity down, a daily immune booster pulls the other way. Mention every supplement to your oncology pharmacist, even the ones marketed as gentle immune support.

— , Clinical Pharmacist · July 18, 2026

Moderate 52 Minor 1 No known interaction 1,399

This box checks one ingredient at a time (like turmeric or magnesium). Taking a supplement product with a whole label of ingredients? Search the product instead — we check every ingredient on it ↓

Most Viewed Ingredient Interactions

Rituximab: Top Interactions at a Glance

The Rituximab supplement & herbal interactions people checked most in the last 24 hours, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 53 interacting ingredients — plus 1,399 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Rituximab Combinations Today

The Rituximab + supplement pages people viewed most in the last 24 hours (resets at midnight). Open any card for the full report.

Moderate Likelihood Possible Larch Arabinogalactan + Rituximabi

Theoretically, larch arabinogalactan might interfere with immunosuppression therapy due to immunostimulant effects.

Read the full interaction Moderate Likelihood Possible Black Seed + Rituximabi

Theoretically, black seed might interfere with immunosuppressive therapy.

Read the full interaction Moderate Likelihood Possible Cordyceps + Rituximabi

Theoretically, concurrent use of cordyceps might interfere with immunosuppressive therapy.

Read the full interaction Moderate Likelihood Possible Alfalfa + Rituximabi

Theoretically, alfalfa might decrease the efficacy of immunosuppressive therapy.

Read the full interaction Moderate Likelihood Possible Active Hexose Correlated Compound (ahcc) + Rituximabi

Theoretically, taking AHCC might decrease the effects of immunosuppressant drugs.

Read the full interaction Moderate Likelihood Possible American Ginseng + Rituximabi

Theoretically, American ginseng use might interfere with immunosuppressive therapy.

Read the full interaction
The complete list

Every Supplement Checked Against Rituximab

All 1,452 ingredients in our database, ranked by severity — 53 with a Rituximab interaction on file and 1,399 with none found. Filter by severity or search any ingredient; hover the for what each ingredient is.

Looking for an interaction with a specific supplement product? Search products instead ↓

Straight answers

Can You Take It With Rituximab?

One-line answers, one card per combination — scroll through today’s 20 and tap any card for the full report. A different set rotates in daily until every combination has had its turn.

Can you take Larch Arabinogalactan with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, larch arabinogalactan might interfere with immunosuppression therapy due to immunostimulant effects.

Full Larch Arabinogalactan + Rituximab answer

Can you take Black Seed with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, black seed might interfere with immunosuppressive therapy.

Full Black Seed + Rituximab answer

Can you take Cordyceps with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concurrent use of cordyceps might interfere with immunosuppressive therapy.

Full Cordyceps + Rituximab answer

Can you take Alfalfa with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, alfalfa might decrease the efficacy of immunosuppressive therapy.

Full Alfalfa + Rituximab answer

Can you take Boswellia Serrata with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, Boswellia serrata might alter the effects of immunosuppressive drugs.

Full Boswellia Serrata + Rituximab answer

Can you take Bupleurum with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, bupleurum might decrease the effects of immunosuppressants.

Full Bupleurum + Rituximab answer

Can you take Cat's Claw with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cat's claw might interfere with immunosuppressive therapy.

Full Cat's Claw + Rituximab answer

Can you take Catechu with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, catechu might interfere with immunosuppressant therapy.

Full Catechu + Rituximab answer

Can you take Ceylon Leadwort with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Plumbagin, a constituent of Ceylon leadwort, has demonstrated immunosuppressant activity in animal research.

Full Ceylon Leadwort + Rituximab answer

Can you take Chaga with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, chaga might interfere with immunosuppressive therapy.

Full Chaga + Rituximab answer

Can you take Echinacea with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Echinacea has immunostimulant activity which may interfere with immunosuppressant therapy.

Full Echinacea + Rituximab answer

Can you take Elderberry with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, elderberry might interfere with immunosuppressant therapy due to its immunostimulant activity.

Full Elderberry + Rituximab answer

Can you take Eleuthero with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, eleuthero might interfere with immunosuppressive drugs because of its immunostimulant activity.

Full Eleuthero + Rituximab answer

Can you take European Mistletoe with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, European mistletoe might decrease the effectiveness of immunosuppressants.

Full European Mistletoe + Rituximab answer

Can you take Fermented Milk with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fermented milk might decrease the effects of immunosuppressants.

Full Fermented Milk + Rituximab answer

Can you take Fermented Wheat Germ Extract with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fermented wheat germ extract might decrease the effects of immunosuppressants.

Full Fermented Wheat Germ Extract + Rituximab answer

Can you take Fulvic Acid with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking fulvic acid might decrease the effects of immunosuppressive therapy.

Full Fulvic Acid + Rituximab answer

Can you take Galacto-oligosaccharides (gos) with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, GOS might reduce the effects of immunosuppressants.

Full Galacto-oligosaccharides (gos) + Rituximab answer

Can you take Glyconutrients with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Evidence from in vitro research suggests that glyconutrients stimulate certain immune responses.

Full Glyconutrients + Rituximab answer

Can you take Greater Celandine with Rituximab?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Preliminary clinical research suggests that taking a specific semi-synthetic derivative of the greater celandine constituent chelidonine (Uk...

Full Greater Celandine + Rituximab answer
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 entry links to a full report with the clinical detail, likelihood, evidence level, and citations for that exact combination.
  • Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

How Does Our Interaction Checker Work?

Behind every verdict on this page is a category system. Our source database doesn’t document supplement interactions drug-by-drug — it documents them against groups of medications that behave the same way (for example, “drugs processed by the CYP3A4 liver enzyme” or “blood-thinning medications”).

So the check works in three steps: (1) Rituximab is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Rituximab, and (3) each ingredient keeps its own severity, likelihood, and evidence grades from the underlying record. That’s why one supplement can carry several records for one drug — it may interact through more than one category.

Rituximab sits in 1 interaction category. Open any one to see what the group means:

Immunosuppressants 53 ingredients

Medications that damp down the immune system. Supplements that stimulate immunity can work against them.

53 of the supplement ingredients on this page reach Rituximab through this category.

About Rituximab

Rituximab (Rituxan) is a targeted antibody therapy used to treat certain blood cancers, rheumatoid arthritis, and several other serious immune-related conditions.

Generic name: Rituximab  ·  Brand name: Rituxan.

See the full Rituximab Injection drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Rituximab

Most supplements are combination products — and the interaction may come from an ingredient you didn’t buy it for. Search any product below (or scan its label) and we’ll check every ingredient on it against Rituximab.

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Pharmacist Counseling Corner

Rituximab & Supplements: Common Questions

What supplements interact with Rituximab?
In our interaction database, 53 supplement and herbal ingredients have an interaction with Rituximab on file — 0 rated major, 52 moderate, and 1 minor. That number sounds scarier than it is: severity matters far more than the count, which is why the list on this page is ranked instead of alphabetical. Start at the top. The highest-ranked right now: Active Hexose Correlated Compound (ahcc), Alfalfa, American Ginseng.
Which Rituximab supplement interactions are the most serious?
None of the Rituximab supplement interactions on file are currently rated major. The most significant are the 52 moderate-rated ones — combinations that may need monitoring, a dose adjustment, or separated timing. Still worth a quick look through the ranked list for anything you take daily. Jump to the ranked list.
Can I take vitamins or supplements while on Rituximab?
That depends entirely on which supplement. The honest answer for Rituximab is in the ranked list above — and if what you take is a combination product with a dozen ingredients, don't check them one by one: photograph the label with our scanner and we'll check the whole thing at once. Try the label scanner or the interaction checker.
Do brands like Rituxan have the same supplement interactions as Rituximab?
Yes — Rituxan all contain Rituximab, so everything on this page applies to them equally. Interactions belong to the active drug, never to the brand on the box; the same is true of generics.
Where do these interaction ratings come from?
Every rating comes from the Natural Medicines database — the same evidence-graded reference pharmacists and hospitals use — and each interaction carries three separate grades: severity (how bad it can be), likelihood (how well it's documented in studies and case reports), and an evidence level. Our pharmacists review the content; we never let an AI decide an interaction. See how to read the ratings and our editorial policy.
What about Rituximab and my other medications?
This page covers Rituximab against supplements and herbal ingredients. Checking Rituximab against your other prescription or OTC medications is a different tool — our drug interaction checker covers that side. Head to the drug–drug interaction checker, or read the full Rituximab Injection drug information.

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

Where next

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Sourcing

Where This Data Comes From — and Why You Can Trust It

🧪 Licensed clinical database

Every interaction verdict on this page comes from Natural Medicines Pro (TRC Healthcare / Therapeutic Research) — the same evidence-graded reference used by pharmacists and hospitals. We license this data directly; we do not scrape it, and no AI invents an interaction.

🧑‍⚕️ Pharmacist review

This page is curated and coded by , Clinical Pharmacist, with additional analysis by the HelloPharmacist Pharmacist Team. Editorial commentary is ours; the licensed interaction records are shown as sourced.

🔄 Kept current

Our interaction database refreshes on a weekly cycle, and this page re-checks the live database every time it’s rebuilt — what you see reflects the database as of September 22, 2026.

🔍 Full transparency

How every dataset on this site is sourced, licensed, and updated is documented publicly: our data sources · editorial policy · how we use AI.

Educational information, not medical advice. An interaction being on file does not mean it will happen to you — and absence of one is not proof of safety. Never start or stop a medication or supplement without talking to your pharmacist or doctor.