Interactions on record — worth a quick check against your medications. Based on 2 of 5 ingredients. Check your meds →
Dietary supplement

Spore Probiotic Powder Ingredients & Drug Interactions

by youtheory

Spore Probiotic Powder label
See full label image
Powder Category: Other Combinations
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Spore Probiotic Powder 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

Spore Probiotic Powder is a dietary supplement by youtheory with 5 active ingredients. Its ingredients are commonly taken for digestive health and bloating, diarrhea support, immune support.Based on those ingredients, 182 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Bacillus subtilis (MTCC 5981), Bacillus coagulans (MTCC 5856). Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Spore Probiotic Powder by youtheory

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

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HelloPharmacist Scorecard of Spore Probiotic Powder by youtheory

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 Jul 11, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 2 of its 5 active ingredients.
  • “Proprietary Probiotic Blend” is a proprietary blend — the label doesn't break down how much of each component you get.

This powder contains 5 active ingredients: two spore-forming Bacillus strains (subtilis and coagulans), one more Bacillus strain (clausii), plus FOS and XOS. The Bacillus strains are probiotics — live beneficial bacteria meant to support your gut.

FOS and XOS are prebiotics, which are types of fiber that feed the good bacteria already in your system. The powder also includes rice dextrin and silicon dioxide as inactive ingredients (fillers and flow agents).

Does it work?

Moderate evidence
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
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: Promotes healthy gut flora and digestive health.
  • We looked for evidence on: Constipation, Diarrhea, Flatulence, Irritable bowel syndrome (IBS), Dyspepsia, Antibiotic-associated diarrhea — and 4 related terms.
  • The strongest evidence on file: Bacillus Coagulans is rated "Possibly Effective" for Constipation (Natural Medicines).
  • Also on file: Bacillus Coagulans is rated "Possibly Effective" for Irritable bowel syndrome (IBS).
  • Also on file: Bacillus Subtilis is rated "Possibly Effective" for Antibiotic-associated diarrhea.

Bacillus coagulans is possibly effective for constipation and irritable bowel syndrome (IBS). Bacillus subtilis is possibly effective for antibiotic-associated diarrhea — the kind you get when antibiotics wipe out your normal gut bacteria.

For other uses — athletic performance, blood sugar control, eczema, and several others — the evidence we have isn't strong enough to say whether either strain works. We don't have effectiveness data on file for FOS, XOS, or Bacillus clausii.

The evidence, ingredient by ingredient Bacillus Subtilis Bacillus Coagulans

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 2 of the 2 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 2 of 2.
  • General safety write-ups exist for 2 of 2.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Both Bacillus subtilis and coagulans are generally well tolerated in healthy adults, though the safety profile varies between products and strains. In trials, headache and diarrhea have been reported rarely.

There's a theoretical concern that live probiotic organisms could cause infection in people with severely weakened immune systems, central lines, or critical illness — but these cases are uncommon in otherwise healthy people. Because safety data is limited, talk with your doctor before starting this product, especially if you're pregnant, nursing, or have a weakened immune system.

Side effects, ingredient by ingredient Bacillus Subtilis Bacillus Coagulans

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?
  • 2 of the 2 matched ingredients can interact with medications — Bacillus Coagulans, Bacillus Subtilis.
  • The most serious interaction on file is rated Moderate.
  • For scale: 182 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.

If you take antibiotics, separate them from this product — taking them at the same time may reduce how well the probiotic works. Altogether, these interactions span 182 individual medications.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

This probiotic may help with constipation, IBS, or diarrhea from antibiotics, but you'll need to time it carefully if you're on antibiotics. If you're healthy and have a normal immune system, it's generally well tolerated.

Check your exact medications before you start, and talk with your pharmacist or doctor if you're pregnant, nursing, or immunocompromised.

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

Assessment coverage: 2 of 5 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Aug 23, 2021.

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 Spore Probiotic Powder, straight from the product label.

Brand youtheory
Barcode (UPC) 850502007218
Net contents 3.45 Ounce(s); 97 Gram(s)
Market status On market
Date entered into DSLD Aug 23, 2021
DSLD ID 253070
Product type Other Combinations
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Women (not pregnant or lactating)
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 Spore Probiotic Powder by youtheory, 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:
3.26 Gram(s)
Maximum serving Sizes:
3.26 Gram(s)
Servings per container
30
UPC/BARCODE
850502007218
IngredientAmount% DV
FOS1000 mg--
XOS1000 mg--
Bacillus clausii (MTCC 5980)0 NP--
Bacillus subtilis (MTCC 5981)0 NP--
Bacillus coagulans (MTCC 5856)0 NP--
Proprietary Probiotic Blend0 NP--

Other ingredients: Rice Dextrin, Silicon Dioxide

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.
Formulation

Promotes healthy gut flora Resists stomach acid breakdown

Youtheory Spore Probiotic is a better way to replenish your body's microflora. This spore probiotic combination is uniquely designed to survive and thrive. The word "spore" means "seed." And like a seed, each spore probiotic is covered by a naturally protective shell that safeguards the cell until it reached the intestinal tract.

Storage

Does not require refrigeration

Store in a cool and dry place after opening.

Formula

With prebiotics: food for beneficial bacteria

6 billion CFU + prebiotics

FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Suggested Use: Mix one (1) scoop with 6-8 ounces of water.

Precautions

This product is manufactured in a facility that processes fish extracts.

Usage Warnings: Check with your doctor before using this product if you are taking medication or have any medical conditions. Do not use if you are pregnant or nursing.

Do not exceed the recommended daily intake.

Not intended for persons under 18. Keep out of reach of children.

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

Spore Probiotic Powder by youtheory label

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

Spore Probiotic Powder 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 Spore Probiotic Powder by youtheory

These are the 5 active ingredients this product is made of. Select any to open its full monograph.

Serving size3.26 Gram(s) Dosage formPowder Servings per container30 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.

FOS

1000 mg per serving

XOS

1000 mg per serving

Proprietary Probiotic Blend

0 NP per serving

Other (inactive) ingredients: Rice Dextrin, Silicon Dioxide. These complete the product’s ingredient list but are not active constituents.

Interaction report

Spore Probiotic Powder by youtheory Drug Interactions

Want to check YOUR meds against Spore Probiotic Powder?

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
182Drugs
182 Moderate

Ingredients driving the most interactions

Bacillus subtilis (MTCC 5981) 182
Bacillus coagulans (MTCC 5856) 182

Individual Drug Interactions

The ingredients in Spore Probiotic Powder interact with 182 drugs. Click any drug to see the details.

2 of the 5 ingredients in Spore Probiotic Powder interact with drugs. Each result below shows which ingredient is responsible. Bacillus subtilis (MTCC 5981) Bacillus coagulans (MTCC 5856)

Each ingredient & the kinds of drugs it affects

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

Bacillus subtilis (MTCC 5981)1 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking Bacillus subtilis with antibiotic drugs might decrease the effectiveness of B. subtilis.
Since B. subtilis preparations usually contain live and active organisms, simultaneously taking antibiotics might kill a significant number of the organisms. Tell patients to separate administration of antibiotics and B. subtilis preparations by at least 2 hours.

Likelihood Probable Evidence D
Bacillus subtilis (MTCC 5981) full monograph & interactions

Bacillus coagulans (MTCC 5856)1 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking antibiotics with Bacillus coagulans might decrease the effectiveness of B. coagulans.
B. coagulans preparations usually contain live and active organisms. Therefore, simultaneously taking antibiotics might kill a significant number of the organisms. Tell patients to separate administration of antibiotics and B. coagulans preparations by at least two hours.

Likelihood Probable Evidence D
Bacillus coagulans (MTCC 5856) full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Spore Probiotic Powder, from the product label.

youtheory

See all youtheory products
Name
Nutrawise
City
Irvine
State
CA
ZipCode
92618
Phone Number
1.888.271.8976
Web Address
youtheory.com
Pharmacist Counseling Corner

Spore Probiotic Powder by youtheory: Common Questions

Does Spore Probiotic Powder by youtheory interact with any medications?
Yes. Based on its ingredients, Spore Probiotic Powder has a known interaction with 182 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Spore Probiotic Powder contains 5 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.
Can I take this while I'm on antibiotics?
You can, but timing matters. Antibiotics can kill the live Bacillus bacteria in this product, making it less effective. Ask your pharmacist for the best spacing between doses — usually a few hours apart is enough to make a difference.
Does this product actually have 'spores' in it?
Yes — the two main Bacillus strains (subtilis and coagulans) are spore-forming bacteria, which means they're hardy and can survive harsh conditions like stomach acid better than other probiotics. That's why they're marketed as 'spore probiotics.'
Will this help my IBS?
Bacillus coagulans is possibly effective for IBS, so there's some evidence it might help. Results vary from person to person, and you'll likely need to take it consistently for a few weeks to notice a difference.
Is it safe if I'm pregnant or breastfeeding?
The safety data for both Bacillus strains in this product isn't detailed enough to say for certain. Talk with your doctor or pharmacist before using it while pregnant or nursing — they can weigh the potential benefit against what's known about these strains in your situation.
What are FOS and XOS?
They're prebiotics — types of soluble fiber that feed the good bacteria already living in your gut, helping them thrive. We don't have detailed interaction data for them, but they're generally recognized as safe.

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

Not sure if Spore Probiotic Powder is safe with your meds?

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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.

Spore Probiotic Powder label
Go deeper

The Full Monographs Behind Spore Probiotic Powder’s Ingredients

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

Herb & supplement monograph

Bacillus Subtilis

Interacts with 182 drugs

Bacillus subtilis is a spore-forming probiotic bacterium found in soil and some fermented foods, and it is used mainly to support gut health and digestion. Early research is promising for ce...

Read the full Bacillus Subtilis monograph → Herb & supplement monograph

Bacillus Coagulans

Interacts with 182 drugs

Bacillus coagulans is a spore-forming probiotic that survives stomach acid well and may help with some digestive problems such as IBS, constipation, and certain types of diarrhea. The eviden...

Read the full Bacillus Coagulans monograph →
Sources

Sources & How We Checked

Spore Probiotic Powder'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 30 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.

Bacillus Subtilis 10 references
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Lampropoulos PK, Gkentzi D, Tzifas S, Dimitriou G. Neonatal sepsis due to Bacillus subtilis. Cureus 2021;13(9):e17692. PubMed
  3. La Jeon Y, Yang JJ, Kim MJ, et al. Combined Bacillus licheniformis and Bacillus subtilis infection in a patient with oesophageal perforation. J Med Microbiol 2012;61(Pt 12):1766-1769. PubMed
  4. Wallet F, Crunelle V, Roussel-Delvallez M, Fruchart A, Saunier P, Courcol RJ. Bacillus subtilis as a cause of cholangitis in polycystic kidney and liver disease. Am J Gastroenterol 1996;91(7):1477-8.
  5. Velasco E, Martins CA, Tabak D, Bouzas LF. "Bacillus subtilis" infection in a patient submitted to a bone marrow transplantation. Rev Paul Med 1992;110(3):116-7.
  6. Kato A, Yoshifuji A, Komori K, et al. A case of Bacillus subtilis var. natto bacteremia caused by ingestion of natto during COVID-19 treatment in a maintenance hemodialysis patient with multiple myeloma. J Infect Chemother 2022;28(8):1212-1215. PubMed
  7. Freedman KE, Hill JL, Wei Y, et al. Examining the gastrointestinal and immunomodulatory effects of the novel probiotic Bacillus subtilis DE111. Int J Mol Sci 2021;22(5):2453. PubMed
  8. Lefevre M, Racedo SM, Denayrolles M, et al. Safety assessment of Bacillus subtilis CU1 for use as a probiotic in humans. Regul Toxicol Pharmacol 2017;83:54-65. PubMed
  9. Hanifi A, Culpepper T, Mai V, et al. Evaluation of Bacillus subtilis R0179 on gastrointestinal viability and general wellness: a randomised, double-blind, placebo-controlled trial in healthy adults. Benef Microbes 2015;6(1):19-27. PubMed
  10. Tokano M, Tarumoto N, Imai K, et al. A case of bacterial meningitis caused by Bacillus subtilis var. natto. Intern Med. 2022. Epub ahead of print.

See these in context on the Bacillus Subtilis monograph →

Bacillus Coagulans 20 references
  1. Saxelin M, Chuang NH, Chassy B, et al. Lactobacilli and bacteremia in southern Finland 1989-1992. Clin Infect Dis 1996;22:564-6. PubMed
  2. Tynkkynen S, Singh KV, Varmanen P. Vancomycin resistance factor of Lactobacillus rhamnosus GG in relation to enterococcal vancomycin resistance (van) genes. Int J Food Microbiol 1998;41:195-204. PubMed
  3. Klein G, Zill E, Schindler R, et al. Peritonitis associated with vancomycin-resistant Lactobacillus rhamnosus in a continuous ambulatory peritoneal dialysis patient; organism identification, antibiotic therapy, and case report. J Clin Microbiol 1998;36:
  4. Kalima P, Masterton RG, Roddie PH, et al. Lactobacillus rhamnosus infection in a child following bone marrow transplant. J Infect 1996;32:165-7. PubMed
  5. Goldin BR. Health Benefits of probiotics. Br J Nutr 1998;80:S203-7. DOI
  6. Rautio M, Jousimies-Somer H, Kauma H, et al. Liver abscess due to Lactobacillus rhamnosus strain indistinguishable from L. rhamnosus strain GG. Clin Infect Dis 1999;28:1159-60.
  7. MacGregor G, Smith AJ, Thakker B, Kinsella J. Yoghurt biotherapy: contraindicated in immunosuppressed patients? Postgrad Med J 2002;78:366-7. PubMed
  8. Land MH, Rouster-Stevens K, Woods CR, et al. Lactobacillus sepsis associated with probiotic therapy. Pediatrics 2005;115:178-81.
  9. De Groote MA, Frank DN, Dowell E, et al. Lactobacillus rhamnosus GG bacteremia associated with probiotic use in a child with short gut syndrome. Pediatr Infect Dis J 2005;24:278-80. PubMed
  10. Vahabnezhad E, Mochon AB, Wozniak LJ, Ziring DA. Lactobacillus bacteremia associated with probiotic use in a pediatric patient with ulcerative colitis. J Clin Gastroenterol. 2013;47(5):437-9. PubMed
  11. Pruccoli G, Silvestro E, Pace Napoleone C, Aidala E, Garazzino S, Scolfaro C. Are probiotics safe? Bifidobacterium bacteremia in a child with severe heart failure. Infez Med. 2019;27(2):175-178.
  12. Sendil S, Shrimanker I, Mansoora Q, Goldman J, Nookala VK. Lactobacillus rhamnosus bacteremia in an immunocompromised renal transplant patient. Cureus. 2020;12(2):e6887. PubMed
  13. Albarillo FS, Shah U, Joyce C, Slade D. Lactobacillus rhamnosus Infection: A single-center 4-year descriptive analysis. J Glob Infect Dis. 2020;12(3):119-123. PubMed
  14. Pasala S, Singer L, Arshad T, Roach K. Lactobacillus endocarditis in a healthy patient with probiotic use. IDCases. 2020;22:e00915. PubMed
  15. Agrawal S, Tuchman ES, Bruce MJ, Theodorou ME. Fatal Lactobacillus endocarditis in a patient with transcatheter aortic valve replacement. BMJ Case Rep. 2020;13(11):e236835.
  16. Antoun M, Hattab Y, Akhrass FA, Hamilton LD. Uncommon pathogen, Lactobacillus, causing infective endocarditis: Case report and review. Case Rep Infect Dis. 2020;2020:8833948. PubMed
  17. Rossi F, Amadoro C, Gasperi M, Colavita G. Lactobacilli infection case reports in the last three years and safety implications. Nutrients. 2022;14(6):1178. PubMed
  18. Franko B, Vaillant M, Recule C, Vautrin E, et al. Lactobacillus paracasei endocarditis in a consumer of probiotics. Med Mal Infect. 2013;43(4):171-3. PubMed
  19. Campbell RE, Miller A, Afroze A. Native valve endocarditis secondary to Lactobacillus paracasei bacteremia. Consultant. 2020;60(9):27-8. DOI
  20. Kato K, Funabashi N, Takaoka H, et al. Lactobacillus paracasei endocarditis in a consumer of probiotics with advanced and severe bicuspid aortic valve stenosis complicated with diffuse left ventricular mid-layer fibrosis. Int J Cardiol. 2016;224:157-161. PubMed

See these in context on the Bacillus Coagulans 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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