Medication interaction hub

What Supplements Interact with Penicillin VK?

Penicillin VK brand name: Robicillin. Every interaction below applies to the brands too.

56 Interactions 3 Major 42 Moderate 11 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 Penicillin VK? 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 Penicillin VK 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.

Most people take Penicillin VK for a week or two, for strep throat or a dental infection, but even a short course calls for real care with supplements, because a few entries here can harm the kidneys or keep the antibiotic from being absorbed. Activated charcoal can soak up the drug in the gut and cut how much reaches your bloodstream, and two herbs, Siberian cocklebur and asarabacca, can damage the kidneys outright, adding to the strain from other kidney-stressing medicines.

The rest of the list is tamer. About half of it is probiotics and fermented milk, which penicillin can kill off before they do you any good; the fix is spacing them well apart from each dose. Bulky fiber supplements can likewise blunt absorption of oral medicines, and a small group of herbs may make seizures more likely in people already prone to them. Read the three major-rated entries first; the other 53 are moderate (42) or minor (11).

— , Clinical Pharmacist · July 18, 2026

Major 3 Moderate 42 Minor 11 No known interaction 1,396

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

Penicillin VK: Top Interactions at a Glance

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

Showing the 12 highest-ranked of 56 interacting ingredients — plus 1,396 more checked with no known interaction. See the complete ranked list.

Start here

The Major Interactions to Know About

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

Major Likelihood Likely Siberian Cocklebur + Penicillin VKi

Siberian cocklebur can adversely affect the kidney.

Read the full interaction Major Likelihood Probable Activated Charcoal + Penicillin VKi

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 Possible Asarabacca + Penicillin VKi

Asarabacca, a herbaceous plant, is often contaminated with aristolochic acid, a compound known for its nephrotoxic effects.

Read the full interaction
The complete list

Every Supplement Checked Against Penicillin VK

All 1,452 ingredients in our database, ranked by severity — 56 with a Penicillin VK interaction on file and 1,396 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 Penicillin VK?

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 Lactobacillus Delbrueckii with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Lactobacillus delbrueckii with antibiotic drugs might decrease the effectiveness of L.

Full Lactobacillus Delbrueckii + Penicillin VK answer

Can you take Lactobacillus Gasseri with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Lactobacillus gasseri with antibiotic drugs might decrease the effectiveness of L.

Full Lactobacillus Gasseri + Penicillin VK answer

Can you take Lactobacillus Helveticus with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Lactobacillus helveticus with antibiotic drugs might decrease the effectiveness of L.

Full Lactobacillus Helveticus + Penicillin VK answer

Can you take Lactobacillus Jensenii with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Lactobacillus jensenii with antibiotic drugs might decrease the effectiveness of L.

Full Lactobacillus Jensenii + Penicillin VK answer

Can you take Lactobacillus Johnsonii with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Lactobacillus johnsonii with antibiotic drugs might decrease the effectiveness of L.

Full Lactobacillus Johnsonii + Penicillin VK answer

Can you take Latilactobacillus Sakei with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Latilactobacillus sakei with antibiotic drugs might decrease the effectiveness of L.

Full Latilactobacillus Sakei + Penicillin VK answer

Can you take Levilactobacillus Brevis with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Levilactobacillus brevis with antibiotic drugs might decrease the effectiveness of L.

Full Levilactobacillus Brevis + Penicillin VK answer

Can you take Ligilactobacillus Salivarius with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Ligilactobacillus salivarius with antibiotic drugs might decrease the effectiveness of L.

Full Ligilactobacillus Salivarius + Penicillin VK answer

Can you take Limosilactobacillus Fermentum with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Limosilactobacillus fermentum with antibiotic drugs might decrease the effectiveness of L.

Full Limosilactobacillus Fermentum + Penicillin VK answer

Can you take Limosilactobacillus Reuteri with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking Limosilactobacillus reuteri with antibiotic drugs might decrease the effectiveness of L.

Full Limosilactobacillus Reuteri + Penicillin VK answer

Can you take Probiotics with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, taking antibiotic drugs with certain probiotics might decrease the effectiveness of probiotics.

Full Probiotics + Penicillin VK answer

Can you take Aristolochia with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Aristolochia is nephrotoxic.

Full Aristolochia + Penicillin VK answer

Can you take Biofeedback with Penicillin VK?

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 + Penicillin VK answer

Can you take Dendrobium with Penicillin VK?

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 + Penicillin VK answer

Can you take Flaxseed with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Theoretically, antibiotics might interfere with the metabolism of flaxseed constituents, which could potentially alter the effects of flaxse...

Full Flaxseed + Penicillin VK answer

Can you take Ginkgo with Penicillin VK?

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 + Penicillin VK answer

Can you take Guar Gum with Penicillin VK?

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 + Penicillin VK answer

Can you take Gum Arabic with Penicillin VK?

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 + Penicillin VK answer

Can you take Melatonin with Penicillin VK?

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 + Penicillin VK answer

Can you take Mountain Ash with Penicillin VK?

Moderate Possibly, but carefully — this moderate-rated combination may need monitoring, a dose adjustment, or separated timing. Taking large amounts of fresh mountain ash berries may cause kidney damage due to its parasorbic acid constituent.

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

Penicillin VK sits in 4 interaction categories. Open any one to see what the group means:

Antibiotic Drugs 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 Penicillin VK 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 Penicillin VK through this category.

Nephrotoxic 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 Penicillin VK 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 Penicillin VK through this category.

Related: does Penicillin VK deplete any nutrients?

Penicillin VK has 7 reported nutrient associations in the research literature — see the Penicillin VK nutrient depletion report.

Check a real product

Take a Supplement Product? Check the Whole Bottle Against Penicillin VK

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 Penicillin VK.

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Pharmacist Counseling Corner

Penicillin VK & Supplements: Common Questions

What supplements interact with Penicillin VK?
Our database currently documents 56 ingredients with a known Penicillin VK interaction (3 major, 42 moderate, 11 minor). The practical move: scan the major group first, then look up the exact supplements you take rather than reading all 56. The highest-ranked right now: Siberian Cocklebur, Activated Charcoal, Asarabacca.
Which Penicillin VK supplement interactions are the most serious?
The 3 major-rated combinations — led by Siberian Cocklebur, Activated Charcoal and Asarabacca — 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 Penicillin VK?
Plenty of supplements coexist fine with Penicillin VK; 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 Robicillin have the same supplement interactions as Penicillin VK?
Yes — Robicillin all contain Penicillin VK, 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 Penicillin VK deplete any vitamins or nutrients?
It might — Penicillin VK has 7 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 Penicillin VK nutrient depletion report for the specifics and what to discuss with your pharmacist.
What about Penicillin VK and my other medications?
This page covers Penicillin VK against supplements and herbal ingredients. Checking Penicillin VK 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

Where next

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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.