Medication interaction hub

What Supplements Interact with Nelfinavir Mesylate?

Nelfinavir Mesylate brand name: Viracept. Every interaction below applies to the brands too.

153 Interactions 3 Major 113 Moderate 37 Minor
Curated & coded by · Clinical Pharmacist · Updated October 7, 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 Nelfinavir Mesylate? 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 Nelfinavir Mesylate 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.

Nelfinavir mesylate (Viracept) treats HIV, where a steady drug level is what keeps the virus suppressed, so this is a list to read with real care before adding any supplement. Three of the 153 ingredients on file rate major, and St. John's wort is the one I would rule out completely. It speeds up the liver enzyme that clears nelfinavir, which can drop the drug low enough to invite treatment failure and viral resistance. Grapefruit does the opposite, raising levels and the odds of side effects, and activated charcoal can soak up an oral dose before it ever absorbs.

The 113 moderate and 37 minor entries mostly work through the same channels, the CYP3A4 and CYP2C19 liver enzymes and a gut transporter called P-glycoprotein, each capable of nudging nelfinavir's level up or down. With HIV therapy, either direction matters, which is why every supplement here deserves a conversation with your pharmacist first.

— , Clinical Pharmacist · July 18, 2026

Major 3 Moderate 113 Minor 37 No known interaction 1,299

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

Nelfinavir Mesylate: Top Interactions at a Glance

The Nelfinavir Mesylate 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 153 interacting ingredients — plus 1,299 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Nelfinavir Mesylate Combinations Today

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

Moderate Likelihood Possible Cat's Claw + Nelfinavir Mesylatei

Theoretically, cat's claw might increase or decrease the levels and effects of drugs metabolized by CYP3A4.

Read the full interaction Moderate Likelihood Possible Echinacea + Nelfinavir Mesylatei

Echinacea may induce hepatic CYP3A4 and inhibit intestinal CYP3A4.

Read the full interaction Minor Likelihood Possible Ashwagandha + Nelfinavir Mesylatei

Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Read the full interaction Moderate Likelihood Probable Goldenseal + Nelfinavir Mesylatei

Theoretically, goldenseal might increase or decrease serum levels of P-glycoprotein (P-gp) substrates.

Read the full interaction Moderate Likelihood Possible Rhodiola + Nelfinavir Mesylatei

Theoretically, rhodiola might increase levels of P-glycoprotein substrates.

Read the full interaction Major Likelihood Likely Grapefruit + Nelfinavir Mesylatei

Grapefruit juice can increase levels of drugs metabolized by CYP3A4.

Read the full interaction
The complete list

Every Supplement Checked Against Nelfinavir Mesylate

All 1,452 ingredients in our database, ranked by severity — 153 with a Nelfinavir Mesylate interaction on file and 1,299 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 Nelfinavir Mesylate?

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 Cat's Claw with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, cat's claw might increase or decrease the levels and effects of drugs metabolized by CYP3A4.

Full Cat's Claw + Nelfinavir Mesylate answer

Can you take Echinacea with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Echinacea may induce hepatic CYP3A4 and inhibit intestinal CYP3A4.

Full Echinacea + Nelfinavir Mesylate answer

Can you take Ashwagandha with Nelfinavir Mesylate?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Theoretically, ashwagandha might decrease the levels and clinical effects of CYP3A4 substrates.

Full Ashwagandha + Nelfinavir Mesylate answer

Can you take Goldenseal with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, goldenseal might increase or decrease serum levels of P-glycoprotein (P-gp) substrates.

Full Goldenseal + Nelfinavir Mesylate answer

Can you take Rhodiola with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, rhodiola might increase levels of P-glycoprotein substrates.

Full Rhodiola + Nelfinavir Mesylate answer

Can you take Cubebs with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Several compounds isolated from cubebs can inhibit cytochrome P450 3A4 (CYP3A4) in vitro.

Full Cubebs + Nelfinavir Mesylate answer

Can you take Danshen with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Danshen might alter the levels and clinical effects of drugs metabolized by CYP3A4.

Full Danshen + Nelfinavir Mesylate answer

Can you take Delta-9-tetrahydrocannabinol (thc) with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, CYP3A4 inhibitors might increase the levels and clinical effects of THC.

Full Delta-9-tetrahydrocannabinol (thc) + Nelfinavir Mesylate answer

Can you take Devil's Claw with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, devil's claw might increase levels of drugs metabolized by CYP2C19.

Full Devil's Claw + Nelfinavir Mesylate answer

Can you take Dhea with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, DHEA might increase the levels of drugs metabolized by CYP3A4.

Full Dhea + Nelfinavir Mesylate answer

Can you take Diosmin with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, diosmin might inhibit the metabolism of CYP3A4 substrates.

Full Diosmin + Nelfinavir Mesylate answer

Can you take Eleuthero with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, eleuthero might increase levels of P-glycoprotein substrates.

Full Eleuthero + Nelfinavir Mesylate answer

Can you take English Ivy with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, English ivy might increase the levels of drugs metabolized by CYP2C19.

Full English Ivy + Nelfinavir Mesylate answer

Can you take Ergot with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Ergotamine, a constituent of ergot, is a substrate of cytochrome P450 3A4 (CYP3A4).

Full Ergot + Nelfinavir Mesylate answer

Can you take Eucalyptus with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, eucalyptus might increase the levels of CYP2C19 substrates.

Full Eucalyptus + Nelfinavir Mesylate answer

Can you take European Barberry with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, European barberry might increase the levels and clinical effects of CYP3A4 substrates.

Full European Barberry + Nelfinavir Mesylate answer

Can you take Evodia with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, CYP3A4 inhibitors might increase the levels and clinical effects of evodia.

Full Evodia + Nelfinavir Mesylate answer

Can you take False Unicorn with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. In vitro, false unicorn extract inhibits cytochrome P450 3A4 (CYP3A4) activity.

Full False Unicorn + Nelfinavir Mesylate answer

Can you take Fennel with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, fennel might increase levels of drugs metabolized by CYP3A4.

Full Fennel + Nelfinavir Mesylate answer

Can you take Fever Bark with Nelfinavir Mesylate?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, CYP3A4 inhibitors might increase the levels and clinical effects of yohimbine, a constituent of fever bark.

Full Fever Bark + Nelfinavir Mesylate 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) Nelfinavir Mesylate is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Nelfinavir Mesylate, 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.

Nelfinavir Mesylate sits in 6 interaction categories. Open any one to see what the group means:

Cytochrome P450 3A4 (Cyp3A4) Substrates 121 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.

121 of the supplement ingredients on this page reach Nelfinavir Mesylate through this category.

P-Glycoprotein Substrates 37 ingredients

A drug-transport group: these medications are moved in and out of cells by the P-glycoprotein pump. Supplements that affect the pump can change how much of the drug is absorbed or kept in the body.

37 of the supplement ingredients on this page reach Nelfinavir Mesylate through this category.

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 Nelfinavir Mesylate 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 Nelfinavir Mesylate through this category.

Cytochrome P450 3A4 (Cyp3A4) Inhibitors 13 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.

13 of the supplement ingredients on this page reach Nelfinavir Mesylate through this category.

Protease Inhibitors (Pis) 2 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.

2 of the supplement ingredients on this page reach Nelfinavir Mesylate through this category.

About Nelfinavir Mesylate

Nelfinavir is an HIV-1 protease inhibitor used in combination with other antiretroviral medicines to treat HIV-1 infection.

Generic name: Nelfinavir Mesylate  ·  Brand name: Viracept.

See the full Nelfinavir drug information
Check a real product

Take a Supplement Product? Check the Whole Bottle Against Nelfinavir Mesylate

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 Nelfinavir Mesylate.

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Pharmacist Counseling Corner

Nelfinavir Mesylate & Supplements: Common Questions

What supplements interact with Nelfinavir Mesylate?
In our interaction database, 153 supplement and herbal ingredients have an interaction with Nelfinavir Mesylate on file — 3 rated major, 113 moderate, and 37 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: Grapefruit, St. John's Wort, Activated Charcoal.
Which Nelfinavir Mesylate supplement interactions are the most serious?
Focus on the major group: Grapefruit, St. John's Wort and Activated Charcoal. A major rating means the combination can be clinically significant, not that harm is guaranteed — but it's exactly the kind of thing to run past your pharmacist before your next dose, not after. Jump to the ranked list.
Can I take vitamins or supplements while on Nelfinavir Mesylate?
That depends entirely on which supplement. The honest answer for Nelfinavir Mesylate 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 Viracept have the same supplement interactions as Nelfinavir Mesylate?
Yes — Viracept all contain Nelfinavir Mesylate, 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 Nelfinavir Mesylate and my other medications?
This page covers Nelfinavir Mesylate against supplements and herbal ingredients. Checking Nelfinavir Mesylate 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 Nelfinavir drug information.

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

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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 October 7, 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.