Medication interaction hub

What Supplements Interact with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Ephedrine, Phenobarbital, Potassium Iodide, Theophylline brand names: Quadrinal, Mudrane. Every interaction below applies to the brands too.

179 Interactions 22 Major 136 Moderate 21 Minor
Curated & coded by · Clinical Pharmacist · Updated September 25, 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline? 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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.

Quadrinal and Mudrane combine a stimulant (ephedrine) and a sedative (phenobarbital) with theophylline and potassium iodide, so supplements that push in either direction can cause real trouble, and this list of 179 interacting ingredients deserves genuine care. The everyday risk to understand is caffeine: with ephedrine it has been linked to dangerous blood pressure spikes, heart attack, and stroke, and 44 stimulant-type ingredients carry similar concerns. On the other side, 78 sedating ingredients, alcohol among them, can deepen phenobarbital's drowsiness and at worst slow breathing.

Twenty-two entries rate major, an unusually high count, alongside 136 moderate and 21 minor. St. John's wort belongs near the top too; it is well documented to speed phenobarbital's breakdown and quietly weaken the medicine's effect. Learn the major entries first, and count your morning coffee and tea as part of the question.

— , Clinical Pharmacist · July 18, 2026

Major 22 Moderate 136 Minor 21 No known interaction 1,273

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

Ephedrine, Phenobarbital, Potassium Iodide, Theophylline: Top Interactions at a Glance

The Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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 179 interacting ingredients — plus 1,273 more checked with no known interaction. See the complete ranked list.

Start here

The Most-Checked Ephedrine, Phenobarbital, Potassium Iodide, Theophylline Combinations Today

The Ephedrine, Phenobarbital, Potassium Iodide, Theophylline + supplement pages people viewed most in the last 24 hours (resets at midnight). Open any card for the full report.

Major Likelihood Probable Green Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Read the full interaction Major Likelihood Probable Caffeine + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Read the full interaction Major Likelihood Probable Coffee + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Theoretically, concomitant use might increase the risk of stimulant adverse effects.

Read the full interaction Major Likelihood Probable Guarana + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Read the full interaction Major Likelihood Probable Oolong Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Read the full interaction Moderate Likelihood Probable Folic Acid + Ephedrine, Phenobarbital, Potassium Iodide, Theophyllinei

Folic acid might have antagonistic effects on phenobarbital and increase the risk for seizures.

Read the full interaction
The complete list

Every Supplement Checked Against Ephedrine, Phenobarbital, Potassium Iodide, Theophylline

All 1,452 ingredients in our database, ranked by severity — 179 with a Ephedrine, Phenobarbital, Potassium Iodide, Theophylline interaction on file and 1,273 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

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 Green Tea with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Full Green Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Caffeine with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Full Caffeine + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Coffee with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk of stimulant adverse effects.

Full Coffee + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Guarana with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Full Guarana + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Oolong Tea with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for stimulant adverse effects.

Full Oolong Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take 1,4-butanediol with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use of 1,4-butanediol with CNS depressants may potentiate respiratory and CNS depression.

Full 1,4-butanediol + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Activated Charcoal with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

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 + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Black Tea with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for simulant adverse effects.

Full Black Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Ephedra with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for serious adverse effects.

Full Ephedra + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Gamma-hydroxybutyrate (ghb) with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. GHB may increase the risk of serious CNS and respiratory depression.

Full Gamma-hydroxybutyrate (ghb) + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Green Coffee with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk of stimulant adverse effects.

Full Green Coffee + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Ilex Guayusa with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk of stimulant adverse effects.

Full Ilex Guayusa + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Kava with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Combining kava with CNS depressants can have additive sedative effects.

Full Kava + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take L-tryptophan with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use of L-tryptophan with CNS depressants might cause additive sedative effects.

Full L-tryptophan + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Peyote with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Concomitant use of peyote with stimulant drugs may increase the risk of adverse CNS effects.

Full Peyote + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Pu-erh Tea with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might increase the risk for simulant adverse effects.

Full Pu-erh Tea + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Rauvolfia Vomitoria with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, concomitant use might cause additive effects.

Full Rauvolfia Vomitoria + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Sida Cordifolia with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, Sida cordifolia might increase the risk of adverse cardiovascular effects when taken with stimulant drugs.

Full Sida Cordifolia + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Yerba Mate with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Major Use real caution — this is a major-rated interaction, generally best avoided or used only under close supervision. Theoretically, the caffeine in yerba mate might increase the risk for stimulant adverse effects when used concomitantly with ephedrine.

Full Yerba Mate + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline answer

Can you take Cinchona with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking cinchona might increase the adverse effects of phenobarbital.

Full Cinchona + Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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) Ephedrine, Phenobarbital, Potassium Iodide, Theophylline is classified into the pharmacology categories it belongs to, (2) every supplement interaction documented against any of those categories is inherited by Ephedrine, Phenobarbital, Potassium Iodide, Theophylline, 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.

Ephedrine, Phenobarbital, Potassium Iodide, Theophylline sits in 14 interaction categories. Open any one to see what the group means:

Cns Depressants 78 ingredients

Central-nervous-system depressants. Sedating supplements can intensify drowsiness and slowed reactions when combined.

78 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Stimulant Drugs 44 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.

44 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Theophylline 27 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.

27 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Cytochrome P450 3A4 (Cyp3A4) Inducers 19 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.

19 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Phenobarbital (Luminal) 16 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.

16 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Ephedrine 14 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.

14 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Barbiturates 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Methylxanthines 5 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.

5 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Cytochrome P450 2C9 (Cyp2C9) Inducers 3 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.

3 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Cytochrome P450 2C19 (Cyp2C19) Inducers 2 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.

2 of the supplement ingredients on this page reach Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Alpha-Adrenergic Agonists 1 ingredient

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.

1 of the supplement ingredient on this page reaches Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Cytochrome P450 1A2 (Cyp1A2) Inducers 1 ingredient

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.

1 of the supplement ingredient on this page reaches Ephedrine, Phenobarbital, Potassium Iodide, Theophylline through this category.

Related: does Ephedrine, Phenobarbital, Potassium Iodide, Theophylline deplete any nutrients?

Ephedrine, Phenobarbital, Potassium Iodide, Theophylline has 22 reported nutrient associations in the research literature — see the Ephedrine, Phenobarbital, Potassium Iodide, Theophylline nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Ephedrine, Phenobarbital, Potassium Iodide, Theophylline

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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline.

Search a supplement product

Type a product name, brand, or UPC — smart search across our full catalog.

Grounded search over our product catalog — every verdict comes from our interaction database, never AI guesswork. How we use AI

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Photograph any Supplement Facts panel — we read the ingredients and check each one against your medications. Free, in seconds.

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Prefer typing? The interaction checker looks up products by name too.

Products that contain Ephedrine, Phenobarbital, Potassium Iodide, Theophylline-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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline.

Standardized St. John's Wort 600 mg by Nature's Truth contains St. John's Wort St. John's Wort-IMT by SP Standard Process contains St. John's Wort St John's Wort Extract by SuperSmart contains St. John's Wort St John's Wort 400 mg by Signature Supplements contains St. John's Wort
Pharmacist Counseling Corner

Ephedrine, Phenobarbital, Potassium Iodide, Theophylline & Supplements: Common Questions

What supplements interact with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?
Our database currently documents 179 ingredients with a known Ephedrine, Phenobarbital, Potassium Iodide, Theophylline interaction (22 major, 136 moderate, 21 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 179. The highest-ranked right now: Beer, St. John's Wort, Wine.
Which Ephedrine, Phenobarbital, Potassium Iodide, Theophylline supplement interactions are the most serious?
Focus on the major group: Beer, St. John's Wort, Wine, 1,4-butanediol and Activated Charcoal, among others. 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?
Plenty of supplements coexist fine with Ephedrine, Phenobarbital, Potassium Iodide, Theophylline; 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 Quadrinal have the same supplement interactions as Ephedrine, Phenobarbital, Potassium Iodide, Theophylline?
Yes — Quadrinal, Mudrane all contain Ephedrine, Phenobarbital, Potassium Iodide, Theophylline, 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline deplete any vitamins or nutrients?
It might — Ephedrine, Phenobarbital, Potassium Iodide, Theophylline has 22 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 Ephedrine, Phenobarbital, Potassium Iodide, Theophylline nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Ephedrine, Phenobarbital, Potassium Iodide, Theophylline and my other medications?
This page covers Ephedrine, Phenobarbital, Potassium Iodide, Theophylline against supplements and herbal ingredients. Checking Ephedrine, Phenobarbital, Potassium Iodide, Theophylline 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 25, 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.