Medication interaction hub

What Supplements Interact with Levodopa?

Levodopa brand names: Larodopa, Inbrija. Every interaction below applies to the brands too.

41 Interactions 8 Major 22 Moderate 11 Minor
Curated & coded by · Clinical Pharmacist · Updated October 2, 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 Levodopa? 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 Levodopa 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.

Parkinson symptoms return fast when levodopa (Larodopa, Inbrija) stops reaching the brain, and most of the 41 supplements on this page can make that happen, so treat these combinations with genuine care. Protein and amino acid supplements compete with levodopa for transport into the brain, while everyday minerals like magnesium and iron block its absorption. Cowhage stands apart because it actually contains levodopa, sometimes hundreds of milligrams per dose, and adding it can push the drug's effects too far.

Eight of the 41 rate major, with 22 moderate and 11 minor, and the majors are the ones tied to worsened tremor, rigidity, and on-off swings, so learn those first. A smaller group can make seizures easier to trigger, and a few may add to dopamine activity. For the absorption blockers, spacing doses well apart helps, and your pharmacist can sort out which need distance and which to skip.

— , Clinical Pharmacist · July 18, 2026

Major 8 Moderate 22 Minor 11 No known interaction 1,411

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

Levodopa: Top Interactions at a Glance

The most significant Levodopa supplement & herbal interactions, colored by severity. Tap any ingredient to open the full report for that pair.

Showing the 12 highest-ranked of 41 interacting ingredients — plus 1,411 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

The most clinically significant Levodopa + supplement combinations in our database, best-documented first. Open any card for the full report.

Major Likelihood Likely Cowhage + Levodopai

Concomitant use can increase the risk of levodopa-related adverse effects.

Read the full interaction Major Likelihood Probable Activated Charcoal + Levodopai

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

Read the full interaction Major Likelihood Probable Branched-chain Amino Acids (bcaa) + Levodopai

BCAAs in large doses can reduce the effects of levodopa.

Read the full interaction Major Likelihood Probable Indian Snakeroot + Levodopai

Theoretically, taking Indian snakeroot with levodopa may reduce the effectiveness of levodopa.

Read the full interaction Major Likelihood Probable Magnesium + Levodopai

Magnesium can reduce the bioavailability of levodopa/carbidopa.

Read the full interaction Major Likelihood Probable Phenylalanine + Levodopai

Phenylalanine, especially in high doses, can reduce the effectiveness of levodopa.

Read the full interaction
The complete list

Every Supplement Checked Against Levodopa

All 1,452 ingredients in our database, ranked by severity — 41 with a Levodopa interaction on file and 1,411 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 Levodopa?

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 Magnesium with Levodopa?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Magnesium can reduce the bioavailability of levodopa/carbidopa.

Full Magnesium + Levodopa answer

Can you take Whey Protein with Levodopa?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, whey protein might decrease levodopa absorption.

Full Whey Protein + Levodopa answer

Can you take Coffee Charcoal with Levodopa?

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 + Levodopa answer

Can you take European Mandrake with Levodopa?

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 + Levodopa answer

Can you take Glucomannan with Levodopa?

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 + Levodopa answer

Can you take Iron with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Iron might decrease levodopa levels by reducing its absorption.

Full Iron + Levodopa answer

Can you take Octacosanol with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Concomitant use may worsen symptoms of Parkinson disease.

Full Octacosanol + Levodopa answer

Can you take Tyrosine with Levodopa?

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

Full Tyrosine + Levodopa answer

Can you take Ayahuasca with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, ayahuasca might have additive effects when used with dopamine agonists.

Full Ayahuasca + Levodopa answer

Can you take Banana with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Taking banana may reduce the effectiveness of levodopa.

Full Banana + Levodopa answer

Can you take Biofeedback with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. There is some concern that electroencephalogram (EEG) biofeedback might lower the seizure threshold in some patients.

Full Biofeedback + Levodopa answer

Can you take Black Horehound with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, black horehound might have additive effects when used with dopamine agonists.

Full Black Horehound + Levodopa answer

Can you take Dendrobium with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. The dendrobium constituent dendrobine is reported to have convulsant effects.

Full Dendrobium + Levodopa answer

Can you take Ginkgo with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking ginkgo with drugs that lower the seizure threshold might increase the risk for convulsions.

Full Ginkgo + Levodopa answer

Can you take Guar Gum with Levodopa?

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 + Levodopa answer

Can you take Gum Arabic with Levodopa?

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 + Levodopa answer

Can you take Melatonin with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking melatonin with drugs that lower the seizure threshold might increase the risk of seizure activity.

Full Melatonin + Levodopa answer

Can you take Rauwolscine with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking rauwolscine with seizure threshold lowering drugs might increase the risk of adverse convulsant effects.

Full Rauwolscine + Levodopa answer

Can you take Same with Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. SAMe might reduce the effectiveness of levodopa.

Full Same + Levodopa answer

Can you take Slippery Elm with Levodopa?

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

Levodopa sits in 5 interaction categories. 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 Levodopa through this category.

Levodopa 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 Levodopa through this category.

Seizure Threshold Lowering Drugs 6 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.

6 of the supplement ingredients on this page reach Levodopa through this category.

Dopamine Agonists 4 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.

4 of the supplement ingredients on this page reach Levodopa through this category.

Levodopa/Carbidopa (Sinemet) 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 Levodopa through this category.

About Levodopa

Levodopa oral inhalation (Inbrija) is an inhaled form of levodopa used to treat the sudden return of Parkinson's disease symptoms known as OFF episodes.

Generic name: Levodopa  ·  Brand names: Larodopa, Inbrija.

See the full Levodopa Oral Inhalation drug information

Related: does Levodopa deplete any nutrients?

Levodopa has 4 reported nutrient associations in the research literature — see the Levodopa nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Levodopa

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 Levodopa.

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Pharmacist Counseling Corner

Levodopa & Supplements: Common Questions

What supplements interact with Levodopa?
In our interaction database, 41 supplement and herbal ingredients have an interaction with Levodopa on file — 8 rated major, 22 moderate, and 11 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: Cowhage, Activated Charcoal, Branched-chain Amino Acids (bcaa).
Which Levodopa supplement interactions are the most serious?
The 8 major-rated combinations — led by Cowhage, Activated Charcoal, Branched-chain Amino Acids (bcaa), Indian Snakeroot and Magnesium — 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 Levodopa?
That depends entirely on which supplement. The honest answer for Levodopa 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 Larodopa have the same supplement interactions as Levodopa?
Yes — Larodopa, Inbrija all contain Levodopa, 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.
Does Levodopa deplete any vitamins or nutrients?
It might — Levodopa has 4 reported nutrient-depletion associations in the research literature, which is a different question from interactions: instead of a supplement changing the drug, the drug may lower a nutrient over time. See the Levodopa nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Levodopa and my other medications?
This page covers Levodopa against supplements and herbal ingredients. Checking Levodopa 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 Levodopa Oral Inhalation 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 2, 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.