Medication interaction hub

What Supplements Interact with Carbidopa, Levodopa?

Carbidopa, Levodopa brand names: Sinemet CR, Sinemet, Rytary, Dhivy. Every interaction below applies to the brands too.

43 Interactions 8 Major 24 Moderate 11 Minor
Curated & coded by · Clinical Pharmacist · Updated September 22, 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 Carbidopa, 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 Carbidopa, 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.

Carbidopa/levodopa (Sinemet, Rytary) anchors Parkinson's treatment, and because symptom control hinges on how much levodopa actually reaches the brain, the 43 supplements and herbs on this list deserve real respect before you add any of them. Eight carry a major rating, and almost all of the serious entries weaken the drug rather than boost it. Protein and amino acid supplements compete with levodopa for absorption, everyday minerals like magnesium and iron bind it in the gut, and cowhage stands apart because it actually contains levodopa and can pile extra drug on top of your dose.

Most of the 24 moderate entries repeat that absorption story, with a smaller cluster that may make seizures more likely or add to dopamine's effects, and 11 more rate minor. If something can bind or compete with levodopa, take it well apart from your dose, and the eight majors are where I would start reading.

— , Clinical Pharmacist · July 18, 2026

Major 8 Moderate 24 Minor 11 No known interaction 1,409

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

Carbidopa, Levodopa: Top Interactions at a Glance

The Carbidopa, Levodopa 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 43 interacting ingredients — plus 1,409 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Carbidopa, Levodopa Combinations Today

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

Major Likelihood Probable Magnesium + Carbidopa, Levodopai

Magnesium can reduce the bioavailability of levodopa/carbidopa.

Read the full interaction Major Likelihood Probable Phenylalanine + Carbidopa, Levodopai

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

Read the full interaction Minor Likelihood Unlikely Vitamin B6 + Carbidopa, Levodopai

Vitamin B6 may increase the metabolism of levodopa when taken alone, but not when taken in conjunction with carbidopa.

Read the full interaction Moderate Likelihood Probable Iron + Carbidopa, Levodopai

Iron might decrease levodopa levels by reducing its absorption.

Read the full interaction Moderate Likelihood Possible Melatonin + Carbidopa, Levodopai

Theoretically, taking melatonin with drugs that lower the seizure threshold might increase the risk of seizure activity.

Read the full interaction Major Likelihood Probable Whey Protein + Carbidopa, Levodopai

Theoretically, whey protein might decrease levodopa absorption.

Read the full interaction
The complete list

Every Supplement Checked Against Carbidopa, Levodopa

All 1,452 ingredients in our database, ranked by severity — 43 with a Carbidopa, Levodopa interaction on file and 1,409 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 Carbidopa, 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 Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Phenylalanine with Carbidopa, Levodopa?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Phenylalanine, especially in high doses, can reduce the effectiveness of levodopa.

Full Phenylalanine + Carbidopa, Levodopa answer

Can you take Vitamin B6 with Carbidopa, Levodopa?

Minor Usually — this is a minor-rated interaction, generally not clinically significant but worth mentioning to your pharmacist. Vitamin B6 may increase the metabolism of levodopa when taken alone, but not when taken in conjunction with carbidopa.

Full Vitamin B6 + Carbidopa, Levodopa answer

Can you take Iron with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Melatonin with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Glucomannan with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Octacosanol with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Tyrosine with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take 5-htp with Carbidopa, Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Combining 5-HTP and carbidopa can increase the risk of serotonergic side effects.

Full 5-htp + Carbidopa, Levodopa answer

Can you take Ayahuasca with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Banana with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Biofeedback with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Black Horehound with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Dendrobium with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Ginkgo with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Griffonia Simplicifolia with Carbidopa, Levodopa?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Griffonia simplicifolia seed extract with carbidopa might increase the risk of serotonergic and other adverse effects.

Full Griffonia Simplicifolia + Carbidopa, Levodopa answer

Can you take Guar Gum with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Gum Arabic with Carbidopa, 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 + Carbidopa, Levodopa answer

Can you take Rauwolscine with Carbidopa, 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 + Carbidopa, Levodopa answer

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

Carbidopa, Levodopa sits in 6 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 Carbidopa, 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 Carbidopa, 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 Carbidopa, 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 Carbidopa, Levodopa through this category.

Carbidopa (Lodosyn) 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 Carbidopa, 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 Carbidopa, Levodopa through this category.

About Carbidopa, Levodopa

Levodopa and carbidopa is a combination medicine used to treat Parkinson's disease, post-encephalitic parkinsonism, and parkinsonism caused by carbon monoxide or manganese poisoning.

Generic name: Carbidopa, Levodopa  ·  Brand names: Sinemet CR, Sinemet, Rytary, Dhivy.

See the full Levodopa and Carbidopa drug information

Related: does Carbidopa, Levodopa deplete any nutrients?

Carbidopa, Levodopa has 8 reported nutrient associations in the research literature — see the Carbidopa, Levodopa nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Carbidopa, 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 Carbidopa, Levodopa.

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Pharmacist Counseling Corner

Carbidopa, Levodopa & Supplements: Common Questions

What supplements interact with Carbidopa, Levodopa?
In our interaction database, 43 supplement and herbal ingredients have an interaction with Carbidopa, Levodopa on file — 8 rated major, 24 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 Carbidopa, 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 Carbidopa, Levodopa?
That depends entirely on which supplement. The honest answer for Carbidopa, 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 Sinemet CR have the same supplement interactions as Carbidopa, Levodopa?
Yes — Sinemet CR, Sinemet, Rytary, Dhivy all contain Carbidopa, 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 Carbidopa, Levodopa deplete any vitamins or nutrients?
It might — Carbidopa, Levodopa has 8 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 Carbidopa, Levodopa nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Carbidopa, Levodopa and my other medications?
This page covers Carbidopa, Levodopa against supplements and herbal ingredients. Checking Carbidopa, 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 and Carbidopa 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 September 22, 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.