Medication interaction hub

What Supplements Interact with Belzutifan?

Belzutifan brand name: Welireg. Every interaction below applies to the brands too.

60 Interactions 1 Major 45 Moderate 14 Minor
Curated & coded by · Clinical Pharmacist · Updated September 23, 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 Belzutifan? 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 Belzutifan 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.

A drug like belzutifan (Welireg), taken long term to keep kidney and other tumors in check, only works if a steady amount reaches the blood, so I would be genuinely careful before adding supplements here. Most of the interactions on file shift how the liver clears the drug, through the CYP2C19 enzyme or the glucuronidation pathway, nudging levels up or down. The standout is activated charcoal, the sole major-rated entry, which can soak up an oral dose in the gut before it ever absorbs.

Bulky fiber supplements share that absorption concern and are best spaced well apart from your dose. Everyday products sit here too, melatonin and CBD among them, both flagged for raising levels of drugs cleared by CYP2C19, so check whatever you already take against the full report below. Sixty ingredients appear in total; charcoal alone carries the major rating, with 45 moderate and 14 minor filling out the rest.

— , Clinical Pharmacist · July 18, 2026

Major 1 Moderate 45 Minor 14 No known interaction 1,392

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

Belzutifan: Top Interactions at a Glance

The Belzutifan 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 60 interacting ingredients — plus 1,392 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Belzutifan Combinations Today

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

Moderate Likelihood Possible Lentinan + Belzutifani

Laboratory research suggests that lentinan might increase the activity of cytochrome P450 2C19 (CYP2C19).

Read the full interaction Minor Likelihood Possible Karaya Gum + Belzutifani

Co-administration of oral drugs with bulk forming laxatives such as karaya gum may decrease, increase, or have no effect on the absorption of drugs.

Read the full interaction Moderate Likelihood Possible St. John's Wort + Belzutifani

St.

Read the full interaction Major Likelihood Probable Activated Charcoal + Belzutifani

Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the route of administration.

Read the full interaction Moderate Likelihood Probable Brussels Sprout + Belzutifani

A cabbage and Brussels sprout-containing diet seems to boost elimination through glucuronide conjugation.

Read the full interaction Moderate Likelihood Probable Cabbage + Belzutifani

Theoretically, cabbage might increase clearance and decrease the effects of drugs metabolized through glucuronide conjugation.

Read the full interaction
The complete list

Every Supplement Checked Against Belzutifan

All 1,452 ingredients in our database, ranked by severity — 60 with a Belzutifan interaction on file and 1,392 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 Belzutifan?

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 Lentinan with Belzutifan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Laboratory research suggests that lentinan might increase the activity of cytochrome P450 2C19 (CYP2C19).

Full Lentinan + Belzutifan answer

Can you take Karaya Gum with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Co-administration of oral drugs with bulk forming laxatives such as karaya gum may decrease, increase, or have no effect on the absorption o...

Full Karaya Gum + Belzutifan answer

Can you take St. John's Wort with Belzutifan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. St.

Full St. John's Wort + Belzutifan answer

Can you take Activated Charcoal with Belzutifan?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Activated charcoal reduces systemic exposure to many drugs, including those that undergo enterohepatic recirculation, regardless of the rout...

Full Activated Charcoal + Belzutifan answer

Can you take Tragacanth with Belzutifan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, tragacanth might alter absorption of oral drugs.

Full Tragacanth + Belzutifan answer

Can you take Uva Ursi with Belzutifan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, uva ursi may decrease the metabolism of CYP2C19 substrates.

Full Uva Ursi + Belzutifan answer

Can you take Valerian with Belzutifan?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Valerian might weakly inhibit glucuronidation and increase concentrations of drugs metabolized by UGT1A1 and UGT2B7.

Full Valerian + Belzutifan answer

Can you take Thyroid Extract with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Food and medications can interfere with thyroid hormone absorption.

Full Thyroid Extract + Belzutifan answer

Can you take Agar with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Agar forms a thick gel, which may disrupt the absorption of nutrients and medications.

Full Agar + Belzutifan answer

Can you take Algin with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, algin can alter the absorption of oral drugs.

Full Algin + Belzutifan answer

Can you take Black Psyllium with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, psyllium might increase, decrease, or have no effect on the absorption of oral drugs.

Full Black Psyllium + Belzutifan answer

Can you take Blond Psyllium with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, psyllium might increase, decrease, or have no effect on the absorption of oral drugs.

Full Blond Psyllium + Belzutifan answer

Can you take Carob with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, carob might also impair the absorption of oral drugs.

Full Carob + Belzutifan answer

Can you take Eurycoma Longifolia with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, Eurycoma longifolia might increase levels of CYP2C19 substrates.

Full Eurycoma Longifolia + Belzutifan answer

Can you take Hibiscus Sabdariffa with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, Hibiscus sabdariffa extract might reduce the metabolism of CYP2C19 substrates.

Full Hibiscus Sabdariffa + Belzutifan answer

Can you take Kratom with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, kratom might increase the levels of drugs metabolized by CYP2C19.

Full Kratom + Belzutifan answer

Can you take Marshmallow with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, mucilage in marshmallow might impair absorption of oral drugs.

Full Marshmallow + Belzutifan answer

Can you take Xanthan Gum with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, xanthan gum can alter the absorption of oral drugs due to its fiber qualities.

Full Xanthan Gum + Belzutifan answer

Can you take Chrysin with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, chrysin might increase the clearance of drugs that are UGT1A1 substrates, thereby reducing their effectiveness.

Full Chrysin + Belzutifan answer

Can you take Red Clover with Belzutifan?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, red clover might increase the levels and clinical effects of drugs metabolized by CYP2C19.

Full Red Clover + Belzutifan 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) Belzutifan is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Belzutifan, 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.

Belzutifan sits in 3 interaction categories. Open any one to see what the group means:

Cytochrome P450 2C19 (Cyp2C19) Substrates 33 ingredients

A drug-metabolism group: these medications are processed by the named liver enzyme (a cytochrome P450). Supplements that speed this enzyme up or slow it down can lower or raise the medication's levels in your body.

33 of the supplement ingredients on this page reach Belzutifan through this category.

Oral Drugs 17 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

17 of the supplement ingredients on this page reach Belzutifan through this category.

Glucuronidated Drugs 12 ingredients

A pharmacology grouping from our source database: medications in this group share a property that certain supplements are known to interact with, so an interaction documented for the group applies to every drug in it.

12 of the supplement ingredients on this page reach Belzutifan through this category.

About Belzutifan

Belzutifan (Welireg) is a targeted cancer medicine used to treat certain kidney tumors, VHL disease-related tumors, and pheochromocytoma or paraganglioma in adults and some children.

Generic name: Belzutifan  ·  Brand name: Welireg.

See the full Belzutifan drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Belzutifan

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 Belzutifan.

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Type a product name, brand, or UPC — smart search across our full catalog.

Grounded search over our product catalog — every verdict comes from our interaction database, never AI guesswork. How we use AI

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Photograph any Supplement Facts panel — we read the ingredients and check each one against your medications. Free, in seconds.

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Products that contain Belzutifan-interacting ingredients

Real supplements from the NIH label database that contain the top interacting ingredients on this page — each one is worth a full label check before combining with Belzutifan.

Women's 40+ One Daily Multivitamin by MegaFood contains Cabbage Spectro Multivitamin Man by Solaray contains Cabbage Raw Vitamin D3+ by Codeage contains Cabbage Indole-3 Supreme 200 mg by Solaray contains Cabbage
Pharmacist Counseling Corner

Belzutifan & Supplements: Common Questions

What supplements interact with Belzutifan?
More than you might expect — 60 in total, though they are far from equal: 1 are rated major, 45 moderate, and 14 minor. The ranked list on this page puts the ones that genuinely matter first, and every entry opens a full report on that exact pair. The highest-ranked right now: Activated Charcoal, Brussels Sprout, Cabbage.
Which Belzutifan supplement interactions are the most serious?
The 1 major-rated combination — led by Activated Charcoal — deserve real caution: these are the ones generally best avoided, or used only with your prescriber watching. If you take any of them today, don't panic and don't stop anything abruptly — call your pharmacist first. Jump to the ranked list.
Can I take vitamins or supplements while on Belzutifan?
Usually yes — most people on Belzutifan can take most supplements. The catch is the exceptions, and they aren't always the exotic ones (St. John's Wort trips up more prescriptions than almost anything sold next to it). Look up each ingredient you actually take in the list above, and treat "no known interaction" as a green-ish light, not a guarantee. Try the label scanner or the interaction checker.
Do brands like Welireg have the same supplement interactions as Belzutifan?
Yes — Welireg all contain Belzutifan, 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 Belzutifan and my other medications?
This page covers Belzutifan against supplements and herbal ingredients. Checking Belzutifan 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 Belzutifan 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 23, 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.