Drug & supplement interaction

Calcium D-glucarate + Belzutifan

Belzutifan brand name: Welireg.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

Calcium D-glucarate has a moderate interaction with Belzutifan. Theoretically, calcium D-glucarate might increase the clearance of drugs that undergo glucuronidation.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceB
What do Severity, Likelihood & Evidence mean?
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Interaction report

Calcium D-glucarate and Belzutifan

Here is the interaction we found between these two, with the evidence behind it.

Moderate

GLUCURONIDATED DRUGS

Why this applies to Belzutifan

Belzutifan falls under GLUCURONIDATED DRUGS — the group Calcium D-glucarate interacts with.

Theoretically, calcium D-glucarate might increase the clearance of drugs that undergo glucuronidation.
The calcium D-glucarate metabolite, D-glucaro-1,4-lactone, inhibits the enzyme beta-glucuronidase, reducing deconjugation of glucuronides in the intestine and thereby reducing reabsorption of the drugs.
Severity Moderate Likelihood Possible Evidence B

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.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the gist with belzutifan (Welireg). Your body clears this cancer medicine partly by attaching a sugar-like tag to it (a process called glucuronidation) so it can leave through bile and stool. Calcium D-glucarate may block an enzyme in the gut that would otherwise snip off that tag and let some drug get reabsorbed. By keeping the tag in place, the supplement could nudge belzutifan out of your body a little faster, which in theory might lower its blood levels and make it less effective against your tumors.

I want to be honest: this is mostly a theoretical concern based on how the enzyme works, not strong studies on belzutifan itself. Since this drug treats serious VHL-related cancers, please don't add calcium D-glucarate without first checking with your oncology team or pharmacist.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Dwivedi C, Heck WJ, Downie AA, et al. Effect of calcium glucarate on B-glucuronidase activity and glucarate content on certain vegetables and fruits. Biochem Med Metab Bio 1990;43:83-92.
  2. Pantuck EJ, Pantuck CB, Anderson KE, et al. Effect of brussels sprouts and cabbage on drug conjugation. Clin Pharmacol Ther 1984;35:161-9. PubMed
  3. Anon. Calcium-D-Glucarate. Altern Med Review 2002;7(4):336-9.

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction 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.
  • PossibleInteraction 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.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

Calcium D-glucarate Also Interacts With Other Medications

Calcium D-glucarate has 124 moderate, 1 minor known drug interactions in our database — the Belzutifan one above is one of them. If you take anything else, check it against the full list below.

Moderate 124 Minor 1 No known interaction 2,705 (incl. Belzutifan)
Taking anything else?

Check Another of Your Medications Against Calcium D-glucarate

Covers the 2,830 medications we’ve checked against Calcium D-glucarate. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Belzutifan

This page covers Calcium D-glucarate only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Belzutifan page lists 60 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Adrafinil (moderate), Artichoke (moderate), Bacopa (moderate) and Baikal Skullcap (moderate).

By severity: 1 major · 45 moderate · 14 minor.

From our pharmacist’s overview on the Belzutifan page

“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, nud…”

Reviewed by 2 · Jul 18, 2026

Open the Belzutifan interaction page

One more smart check

Taking Calcium D-glucarate as Part of a Dietary Supplement Product? Check It for Interactions

We hold 369 real supplement products containing Calcium D-glucarate, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Calcium D-glucarate. Your product may carry other ingredients that interact with Belzutifan too, on top of Calcium D-glucarate — and those would not show on this page. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Calcium D-glucarate and Belzutifan 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 Calcium D-glucarate
Top half

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

29 days ago today
Medication Belzutifan
Steady interest

#2,606 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.

Supplement

About Calcium D-glucarate

What is Calcium D-glucarate?

Calcium D-glucarate
  • Detoxification support
  • Hormone balance
  • Estrogen metabolism
  • Liver support
  • General wellness

Calcium D-glucarate is a supplement form of a natural compound found in fruits and vegetables that is promoted for 'detoxification' and helping the body clear excess hormones. Human evidence for these benefits is very limited, and most research comes from laboratory or animal studies. Talk to your pharmacist or doctor before using it, especially if you have a hormone-related condition.

Read the full Calcium D-glucarate monograph & all interactions
Medication

About Belzutifan

What Is Belzutifan Used For?

Brand name: Welireg

Welireg (belzutifan) is approved for several serious conditions. In adults with von Hippel-Lindau (VHL) disease, it treats associated kidney cancer (renal cell carcinoma), brain and spine tumors called CNS hemangioblastomas, and pancreatic neuroendocrine tumors — when surgery is not immediately needed.

Welireg also treats adults with clear cell renal cell carcinoma (ccRCC): as an adjuvant treatment (after surgery to remove the kidney) in combination with pembrolizumab or pembrolizumab and berahyaluronidase alfa-pmph to reduce the risk of recurrence, and as a single agent for advanced ccRCC after certain prior therapies have been tried. Additionally, Welireg treats adults and patients aged 12 and older with locally advanced, unresectable, or metastatic pheochromocytoma or paraganglioma (PPGL) — rare tumors of the adrenal glands or nearby nerve tissue.

See full Belzutifan drug information
Keep checking

Other Drugs & Calcium D-glucarate

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

0Major
124Moderate
1Minor
2,704No known interaction
124 Moderate 1 Minor 2,704 No interaction
Moderate

124 interactions

Showing 60 of 124 moderate interactions — see all 124 on the Calcium D-glucarate page.

Minor

1 interaction

No interaction 2,704 drugs checked — show the list

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

Showing the 60 most looked-up of 2,704 medications checked with no known interaction — see the full Calcium D-glucarate list.

See the full Calcium D-glucarate interactions page
See every supplement checked against Belzutifan, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
Calcium D-glucarate monograph › Uses, safety, and every drug interaction in one place Belzutifan supplement interactions › Every supplement checked against Belzutifan, ranked by severity Belzutifan drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking Calcium D-glucarate and Belzutifan Together: Common Questions

Can you take Calcium D-glucarate with Belzutifan?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the Calcium D-glucarate and Belzutifan interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Belzutifan and Calcium D-glucarate?

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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.