Medication interaction hub

What Supplements Interact with Delta-9-Tetrahydrocannabinol (THC)?

Delta-9-Tetrahydrocannabinol (THC) brand name: Tetrahydrocannabinol. Every interaction below applies to the brands too.

17 Interactions 1 Major 7 Moderate 9 Minor
Curated & coded by · Clinical Pharmacist · Updated September 18, 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 Delta-9-Tetrahydrocannabinol (THC)? 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 Delta-9-Tetrahydrocannabinol (THC) 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.

Prescription THC (dronabinol) is usually taken by mouth for chemotherapy nausea or to rebuild appetite, and all 17 supplement interactions on file involve one thing: whether the swallowed dose actually gets absorbed. This list deserves real attention, and activated charcoal, the single major-rated entry, is where to start. Charcoal binds drugs in the gut and can strip away enough of a dose to blunt its effect, a problem when THC is what is keeping nausea in check.

The rest, 7 moderate and 9 minor, are mostly fibers, gums, and mucilage-rich herbs (glucomannan, psyllium, guar gum, slippery elm) that people take for digestion or weight. Most slow or reduce absorption, though a couple can push it up instead, so the effect is unpredictable in both directions. Space any of these well apart from your dose rather than guessing.

— , Clinical Pharmacist · July 18, 2026

Major 1 Moderate 7 Minor 9 No known interaction 1,435

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 ↓

Top Ingredient Interactions

Delta-9-Tetrahydrocannabinol (THC): Top Interactions at a Glance

The most significant Delta-9-Tetrahydrocannabinol (THC) supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 17 interacting ingredients — plus 1,435 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Delta-9-Tetrahydrocannabinol (THC) + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Probable Activated Charcoal + Delta-9-Tetrahydrocannabinol (THC)i

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

Read the full interaction
The complete list

Every Supplement Checked Against Delta-9-Tetrahydrocannabinol (THC)

All 1,452 ingredients in our database, ranked by severity — 17 with a Delta-9-Tetrahydrocannabinol (THC) interaction on file and 1,435 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 Delta-9-Tetrahydrocannabinol (THC)?

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 Carob with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Blond Psyllium with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Karaya Gum with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Marshmallow with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Xanthan Gum with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Activated Charcoal with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Coffee Charcoal with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Coffee charcoal can reduce the absorption of orally administered drugs and should be separated from oral drug administration by at least two...

Full Coffee Charcoal + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take European Mandrake with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, concurrent use might increase absorption of some drugs because of inhibited gastrointestinal (GI) motility caused by European...

Full European Mandrake + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Glucomannan with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, glucomannan may decrease absorption of drugs taken orally.

Full Glucomannan + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Guar Gum with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Guar gum might reduce the absorption of some oral drugs, potentially decreasing their effectiveness.

Full Guar Gum + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Gum Arabic with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, gum arabic can alter the absorption of oral drugs due to its fiber content.

Full Gum Arabic + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Slippery Elm with Delta-9-Tetrahydrocannabinol (THC)?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, slippery elm may slow the absorption and reduce serum levels of oral drugs.

Full Slippery Elm + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Tragacanth with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Thyroid Extract with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Agar with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Algin with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Black Psyllium with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Blond Psyllium with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Karaya Gum with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) answer

Can you take Marshmallow with Delta-9-Tetrahydrocannabinol (THC)?

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 + Delta-9-Tetrahydrocannabinol (THC) 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) Delta-9-Tetrahydrocannabinol (THC) is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Delta-9-Tetrahydrocannabinol (THC), 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.

Delta-9-Tetrahydrocannabinol (THC) sits in 1 interaction category. Open any one to see what the group means:

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 Delta-9-Tetrahydrocannabinol (THC) through this category.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Delta-9-Tetrahydrocannabinol (THC)

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 Delta-9-Tetrahydrocannabinol (THC).

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Products that contain Delta-9-Tetrahydrocannabinol (THC)-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 Delta-9-Tetrahydrocannabinol (THC).

SunFiber by Tomorrow's Nutrition Pro contains Guar Gum Fiber Fusion Daily 3.1 g by Nature's Way contains Guar Gum Mightiest Vite Tasty Fruit Punch Flavor by Little DaVinci contains Guar Gum Digestion Support by NaturesPlus AgeLoss contains Guar Gum
Pharmacist Counseling Corner

Delta-9-Tetrahydrocannabinol (THC) & Supplements: Common Questions

What supplements interact with Delta-9-Tetrahydrocannabinol (THC)?
Our database currently documents 17 ingredients with a known Delta-9-Tetrahydrocannabinol (THC) interaction (1 major, 7 moderate, 9 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 17. The highest-ranked right now: Activated Charcoal, Coffee Charcoal, European Mandrake.
Which Delta-9-Tetrahydrocannabinol (THC) supplement interactions are the most serious?
Focus on the major group: 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 Delta-9-Tetrahydrocannabinol (THC)?
Plenty of supplements coexist fine with Delta-9-Tetrahydrocannabinol (THC); a shorter list does not. Rather than memorizing it, check the specific ingredients on your labels — the ranked list above covers every one we've checked, and multi-ingredient products can be checked label-by-label with our scanner. Try the label scanner or the interaction checker.
Do brands like Tetrahydrocannabinol have the same supplement interactions as Delta-9-Tetrahydrocannabinol (THC)?
Yes — Tetrahydrocannabinol all contain Delta-9-Tetrahydrocannabinol (THC), 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 Delta-9-Tetrahydrocannabinol (THC) and my other medications?
This page covers Delta-9-Tetrahydrocannabinol (THC) against supplements and herbal ingredients. Checking Delta-9-Tetrahydrocannabinol (THC) 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.

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 September 18, 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.