Interactions on record — worth a quick check against your medications. Based on 1 of 2 ingredients. Check your meds →
Dietary supplement

Prebiotic Ingredients & Drug Interactions

by Onnit

Prebiotic label
See full label image
Capsule Category: Botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Prebiotic against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Prebiotic is a dietary supplement by Onnit with 2 active ingredients. Its ingredients are commonly taken for water retention (diuretic), digestive upset, liver and gallbladder support.Based on those ingredients, 457 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Dandelion. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Prebiotic by Onnit

Ask about any prescription or over-the-counter medication and we check it for interactions with Prebiotic by Onnit — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Prebiotic by Onnit

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Sep 3, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 2 of its 2 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

Onnit Prebiotic contains two active ingredients: dandelion and Jerusalem artichoke. Dandelion is a plant traditionally used in herbal medicine; Jerusalem artichoke is a root vegetable that contains inulin, a type of fiber often used in prebiotic formulas.

The capsule itself is made from hydroxypropyl methylcellulose (a plant-based capsule material) and water.

Does it work?

Not established
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use — see Dandelion's own graded uses on its monograph.

Why this rating?
  • The label markets this product for: support healthy gut flora and optimal digestion.
  • We looked for evidence on: Constipation, Dyspepsia, Flatulence, Irritable bowel syndrome, Dysbiosis, Bloating — and 1 related terms.
  • The closest evidence on file: Dandelion is rated "Insufficient Reliable Evidence To Rate" for Constipation (Natural Medicines).
  • Also on file: Dandelion is rated "Insufficient Reliable Evidence To Rate" for Dyspepsia, Flatulence.

The evidence for dandelion's effectiveness isn't established in the data we hold. The product lists several traditional uses — joint pain, tonsillitis, postoperative swelling, and postoperative pain — but for each one, the research is insufficient to rate it reliably.

We also hold no effectiveness data on Jerusalem artichoke for this product.

The evidence, ingredient by ingredient Dandelion

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Dandelion is generally well tolerated when used as food, but supplement-strength doses are less studied. The most common side effects are diarrhea, heartburn, and stomach discomfort.

Rarely, oral use can cause anaphylaxis (a severe allergic reaction) in sensitive individuals, and topical use can cause contact dermatitis. Dandelion can trigger allergic reactions in people sensitive to the daisy family (ragweed, chrysanthemums, marigolds, and related plants).

There isn't enough reliable information on safety while breastfeeding, so caution is advised — talk with your doctor or pharmacist if you're nursing or planning to nurse.

Side effects, ingredient by ingredient Dandelion

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Dandelion.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications; lithium.
  • For scale: 457 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking Onnit Prebiotic, check with your doctor or pharmacist if you take any of these medication types: blood thinners or antiplatelet drugs (like warfarin or aspirin), drugs metabolized by CYP1A2 (including some antidepressants and pain relievers), diabetes medications, potassium-sparing water pills, lithium, or fluoroquinolone antibiotics (like ciprofloxacin). Dandelion may theoretically affect how these work or increase the risk of side effects.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

Onnit Prebiotic may appeal to you if you're looking for a prebiotic fiber blend, but the evidence for its traditional uses isn't well established. Be especially cautious if you take blood thinners, diabetes medications, lithium, water pills, or fluoroquinolone antibiotics — dandelion's interactions with these are theoretical but worth avoiding.

Talk with your doctor or pharmacist before starting this product, especially if you have any allergies to ragweed or the daisy family or if you're pregnant or breastfeeding.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 23, 2023.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Prebiotic, straight from the product label.

Brand Onnit
Net contents 15 Packet(s); 105 Capsule(s)
Market status On market
Date entered into DSLD Aug 23, 2023
DSLD ID 295155
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Prebiotic by Onnit, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
2 Capsule(s)
Maximum serving Sizes:
2 Capsule(s)
Servings per container
15
IngredientAmount% DV
Dandelion600 mg--
Jerusalem Artichoke900 mg--

Other ingredients: Hydroxypropyl Methylcellulose, Water

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Probiotics HCL Enzymes

10 billion colony forming units

Healthy gut Biome A gut Biome of friendly probiotic bacteria is not only important for digestion, it is also where a great deal of our important nutrients are produced. In addition, these all-important little allies are responsible for maintaining a healthy immune system. In order to support the gut Biome, we included five acid-resistant strains of probiotics, along with S. boulardii and prebiotic food to feed our little buddies.

Essential prebiotics Prebiotics are essential to help support the probiotic colonies inside your gut. We included one of the best, Jerusalem artichoke, in our formula and complemented it with dandelion. Five strains of probiotics Probiotic bacteria are responsible for not only helping digestion, but also for optimizing mood and supporting immune function. We added five of the most important acid-resistant probiotic strains: L. Acidophilus DDS-1, L. Plantarum, L. Rhamnosus, B. infantis and B. lactis. Saccharomyces boulardii S. boulardii Is a unique non-pathogenic, non-colonizing probiotic yeast that supports gastrointestinal health by promoting the production of secretory immunoglobulin A. With five billion colony-forming units per capsule and instability to survive stomach acid, this was an ingredient we just couldn't leave out. Digestive enzymes Our flagship proteolytic enzyme blend, DigesTech, offers assistance with the digestion of all five major categories: fats, protein, dairy, fiber, and carbohydrates. Betaine HCL Hydrochloric acid is the stomach’s innate way to assist with the breakdown of food. In combination with enzymes, our betaine HCI forms a potent 1-2 punch to support normal stomach acid function and to support digestion and nutrient absorption.

Formulation

Formulated to help support health gut flora & optimal digestion

Unique formula designed to + breakdown food & absorb nutrients + support the immune system + help support healthy gut flora + digest major macronutrients

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Suggested use Adults, as a dietary supplement, take one packet with your largest meal of the day.

Precautions

Consult a medical doctor before taking this or any other nutritional supplement if you are pregnant, nursing, or suspect a medical condition or are taking any medications.

Keep out of reach of children.

Storage

Store and in a cool, dry place.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Prebiotic by Onnit label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Prebiotic label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Prebiotic by Onnit

These are the 2 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Capsule(s) Dosage formCapsule Servings per container15 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Dandelion

Interacts with
457 drugs
600 mg per serving

Dandelion is a common plant used in food and traditional medicine, often promoted as a natural 'water pill' and digestive aid. Human evidence for thes...

Dandelion monograph & interactions

Jerusalem Artichoke

900 mg per serving

Other (inactive) ingredients: Hydroxypropyl Methylcellulose, Water. These complete the product’s ingredient list but are not active constituents.

Interaction report

Prebiotic by Onnit Drug Interactions

Want to check YOUR meds against Prebiotic?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
457Drugs
457 Moderate

Ingredients driving the most interactions

Dandelion 457

Individual Drug Interactions

The ingredients in Prebiotic interact with 457 drugs. Click any drug to see the details.

1 of the 2 ingredients in Prebiotic interact with drugs. Each result below shows which ingredient is responsible. Dandelion

Each ingredient & the kinds of drugs it affects

For each ingredient in Prebiotic with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Dandelion7 drug types · 457 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, taking dandelion root along with anticoagulant or antiplatelet drugs might increase the risk of bruising and bleeding.
In vitro research suggests that dandelion root inhibits platelet aggregation.

Likelihood Possible Evidence D
Antidiabetes Drugs

Theoretically, dandelion might increase the risk for hypoglycemia when used with antidiabetes drugs.
Laboratory research suggests that dandelion extract may have moderate alpha-glucosidase inhibitor activity and might also increase insulin secretion. Also, in a case report, a 58-year-old woman with type 2 diabetes who was being treated with insulin developed hypoglycemia 2 weeks after beginning to eat salads containing dandelion.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, dandelion might increase levels of drugs metabolized by CYP1A2.
Laboratory research suggests that dandelion might inhibit CYP1A2. So far, this interaction has not been reported in humans. However, until more is known, watch for an increase in the levels of drugs metabolized by CYP1A2 in patients taking dandelion.

Likelihood Possible Evidence D
Glucuronidated Drugs

Theoretically, dandelion might increase the clearance of drugs that are UDP-glucuronosyltransferase substrates.
There is some preliminary evidence that dandelion might induce UDP-glucuronosyltransferase, a phase II enzyme.

Likelihood Possible Evidence D
Lithium

Theoretically, through diuretic effects, dandelion might reduce excretion and increase levels of lithium.
Animal research suggests that dandelion has diuretic properties. As diuretics can increase serum lithium levels, the dose of lithium might need to be decreased when taken with dandelion.

Likelihood Probable Evidence D
Potassium-Sparing Diuretics

Theoretically, dandelion might increase the risk of hyperkalemia when taken with potassium-sparing diuretics.
Dandelion contains significant amounts of potassium.

Likelihood Possible Evidence D
Quinolone Antibiotics

Theoretically, dandelion might lower fluoroquinolone levels.
Animal research shows that dandelion reduces absorption of ciprofloxacin and can lower levels by 73%. However, this effect has not been reported in humans.

Likelihood Possible Evidence D
Dandelion full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Prebiotic, from the product label.

Onnit

See all Onnit products
Name
Onnit Labs, LLC
City
Austin
State
Texas
ZipCode
78744
Phone Number
(855) 666-4899
Web Address
onnit.com
Pharmacist Counseling Corner

Prebiotic by Onnit: Common Questions

Does Prebiotic by Onnit interact with any medications?
Yes. Based on its ingredients, Prebiotic has a known interaction with 457 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Prebiotic contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What is dandelion supposed to do in this product?
Dandelion is listed traditionally for joint pain, tonsillitis, postoperative swelling, and postoperative pain. However, the evidence to support these uses isn't well established in the data we hold.
What are the most common side effects of dandelion?
Diarrhea, heartburn, and stomach discomfort are the most common. Rarely, people sensitive to dandelion can have a severe allergic reaction (anaphylaxis), and topical contact can cause a rash in sensitive skin.
Is this safe if I'm allergic to ragweed?
Dandelion is a member of the daisy family, which includes ragweed. If you're sensitive to ragweed or other plants in that family (like chrysanthemums, marigolds, or daisies), you may have an allergic reaction to dandelion. Talk with your doctor or pharmacist before using this product.
Can I take this while breastfeeding?
There isn't enough reliable information on dandelion's safety while breastfeeding. Talk with your doctor or pharmacist for personalized advice.
What is Jerusalem artichoke in this product?
Jerusalem artichoke is a root vegetable that contains inulin, a type of fiber used in prebiotic formulas. We hold no data on this ingredient's interactions or effectiveness for this product.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Prebiotic label
Go deeper

The Full Monographs Behind Prebiotic’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Dandelion

Interacts with 457 drugs

Dandelion is a common plant used in food and traditional medicine, often promoted as a natural 'water pill' and digestive aid. Human evidence for these uses is very limited, so its benefits...

Read the full Dandelion monograph →
Sources

Sources & How We Checked

Prebiotic's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 27 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Dandelion 27 references
  1. Maliakal PP, Wanwimolruk S. Effect of herbal teas on hepatic drug metabolizing enzymes in rats. J Pharm Pharmacol 2001;53:1323-9. PubMed
  2. Williams CA, Goldstone F, Greenham J. Flavonoids, cinnamic acids and coumarins from the different tissues and medicinal preparations of Taraxacum officinale. Phytochemistry 1996;42:121-7. PubMed
  3. Hussain Z, Waheed A, Qureshi RA, et al. The effect of medicinal plants of Islamabad and Murree region of Pakistan on insulin secretion from INS-1 cells. Phytother Res 2004;18:73-7. PubMed
  4. Racz-Kotilla E, Racz G, Solomon A. The action of Taraxacum officinale extracts on the body weight and diuresis of laboratory animals. Planta Med 1974;26:212-7. PubMed
  5. Zhu M, Wong PY, Li RC. Effects of taraxacum mongolicum on the bioavailability and disposition of ciprofloxacin in rats. J Pharm Sci 1999;88:632-4. PubMed
  6. Jovanovic M, Mimica-Dukic N, Poljacki M, Boza P. Erythema multiforme due to contact with weeds: a recurrence after patch testing. Contact Dermatitis 2003;48:17-25. PubMed
  7. Chivato T, Juan F, Montoro A, Laguna R. Anaphylaxis induced by ingestion of a pollen compound. J Investig Allergol Clin Immunol 1996;6:208-9.
  8. Cohen SH, Yunginger JW, Rosenberg N, Fink JN. Acute allergic reaction after composite pollen ingestion. J Allergy Clin Immunol 1979;64:270-4. PubMed
  9. Lovell CR, Rowan M. Dandelion dermatitis. Contact Dermatitis 1991;25:185-8. PubMed
  10. Agarwal SC, Crook JR, Pepper CB. Herbal remedies -- how safe are they? A case report of polymorphic ventricular tachycardia/ventricular fibrillation induced by herbal medication used for obesity. Int J Cardiol 2006;106:260-1. PubMed
  11. Martín-Muñoz MF, Bartolome B, Caminoa M, et al. Bee pollen: a dangerous food for allergic children. Identification of responsible allergens. Allergol Immunopathol (Madr) 2010;38:263-5. PubMed
  12. Neef H, Cilli F, Declerck PJ, et al. Platelet anti-aggregating activity of Taraxacum officinale Weber. Phytotherapy Research 1996;10:s138-s140.
  13. Cuzzolin L, Zaffani S, and Benoni G. Safety implications regarding use of phytomedicines. Eur.J Clin Pharmacol. 2006;62:37-42. PubMed
  14. Posadzki, P., Watson, L. K., and Ernst, E. Adverse effects of herbal medicines: an overview of systematic reviews. Clin Med 2013;13(1):7-12. PubMed
  15. Wakelin, S. H., Marren, P., Young, E., and Shaw, S. Compositae sensitivity and chronic hand dermatitis in a seven-year-old boy. Br J Dermatol 1997;137(2):289-291. PubMed
  16. Ingber, A. Seasonal allergic contact dermatitis from Taraxacum officinale (dandelion) in an Israeli florist. Contact Dermatitis 2000;43(1):49.
  17. Rodriguez, B., Rodriguez, A., de Barrio, M., Tornero, P., and Baeza, M. L. Asthma induced by canary food mix. Allergy Asthma Proc. 2003;24(4):265-268.
  18. Syhaieva, I. A. [Efficiency of specific immunotherapy in treatment of patients with seasonal allergic rhinitis]. Lik.Sprava. 2006;(1-2):51-53.
  19. Catania, M. A., Oteri, A., Caiello, P., Russo, A., Salvo, F., Giustini, E. S., Caputi, A. P., and Polimeni, G. Hemorrhagic cystitis induced by an herbal mixture. South.Med.J. 2010;103(1):90-92. PubMed
  20. Goksu, E., Eken, C., Karadeniz, O., and Kucukyilmaz, O. First report of hypoglycemia secondary to dandelion (Taraxacum officinale) ingestion. Am J Emerg.Med 2010;28(1):111-112. PubMed
  21. Fernandez-Gonzalez, D., Gonzalez-Parrado, Z., Vega-Maray, A. M., Valencia-Barrera, R. M., Camazon-Izquierdo, B., De, Nuntiis P., and Mandrioli, P. Platanus pollen allergen, Pla a 1: quantification in the atmosphere and influence on a sensitizing populati
  22. Liang, K. L., Su, M. C., Shiao, J. Y., Wu, S. H., Li, Y. H., and Jiang, R. S. Role of pollen allergy in Taiwanese patients with allergic rhinitis. J Formos.Med Assoc. 2010;109(12):879-885. PubMed
  23. Yang, Y., Zhao, Y., Wang, C. S., Wang, X. D., and Zhang, L. [Prevalence of sensitization to aeroallergens in 10 030 patients with allergic rhinitis]. Zhonghua Er.Bi Yan.Hou Tou.Jing.Wai Ke Za Zhi 2011;46(11):914-920.
  24. Davies, M. G. and Kersey, P. J. Contact allergy to yarrow and dandelion. Contact Dermatitis 1986;14(4):256-257. PubMed
  25. Collins JM and Miller DR. Dandelion green bezoar following antrectomy and vagotomy - case report. J Kansas Med Soc 1966;67(6):303-304.
  26. Moriarty B, Pinney JH, Owen-Casey MP, Rustin MH, Deroide F, Laing C, Davenport A. Digital necrosis from dandelion tea. Br J Dermatol. 2013 Jul;169(1):227-30. PubMed
  27. Onal S, Timur S, Okutucu B, Zihnioglu F. Inhibition of alphaglucosidase by aqueous extracts of some potent antidiabetic medicinal herbs. Prep Biochem Biotechnol 2005;35:29-36.

See these in context on the Dandelion monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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