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

Junior Ingredients & Drug Interactions

by UP4

Junior label
See full label image
Powder Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Junior 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

Junior is a dietary supplement by UP4 with 2 active ingredients. Its ingredients are commonly taken for digestive health and balance, diarrhea (including antibiotic-related), vaginal yeast and bacterial infections.Based on those ingredients, 182 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L. acidophilus DDS(R)-1. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Junior by UP4

Ask about any prescription or over-the-counter medication and we check it for interactions with Junior by UP4 — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Junior by UP4

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 Aug 13, 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 0 of its 2 active ingredients.
  • “A Proprietary Probiotic Blend” is a proprietary blend — the label gives one combined amount (18 mg) without saying how much of each component you get.

UP4 Junior contains 2 active probiotic ingredients: Lactobacillus acidophilus DDS(R)-1 and B. lactis, along with a proprietary probiotic blend. Probiotics are live beneficial bacteria that support digestive and gut health.

The powder also contains inactive ingredients — rice dextrin, fructooligosaccharide, and silica — which are used as a base and flow agent.

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: digestive and immune health support.
  • We looked for evidence on: Antibiotic-associated diarrhea, Bacterial vaginosis, Colic, Clostridioides difficile infection, Constipation, Inflammatory bowel disease (IBD) — and 4 related terms.
  • The strongest evidence on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Antibiotic-associated diarrhea (Natural Medicines).
  • Also on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Bacterial vaginosis, Irritable bowel syndrome (IBS).
  • Also on file: Lactobacillus Acidophilus is rated "Insufficient Reliable Evidence To Rate" for Respiratory tract infections, Constipation, Inflammatory bowel disease (IBD), Lactose intolerance.

L. acidophilus shows the most evidence for irritable bowel syndrome, Helicobacter pylori infection, antibiotic-associated diarrhea, and bacterial vaginosis — all rated possibly effective based on available research. For atopic disease (like eczema and allergies), the evidence suggests it's possibly ineffective.

The data on acute respiratory distress syndrome isn't strong enough yet to rate.

The evidence, ingredient by ingredient Lactobacillus Acidophilus

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.

Lactobacillus acidophilus is generally well tolerated in healthy adults and children. In rare cases, gastrointestinal side effects like abdominal discomfort, bloating, diarrhea, and flatulence have been reported, though these are uncommon.

Very rarely, the live bacteria have been linked to serious infections in certain patient populations — most cases involve people with compromised immune systems or underlying conditions. Since the data on this product are limited, check with your doctor or pharmacist before starting, especially if you have a weakened immune system or serious illness.

For pregnancy, the safety data on L. acidophilus rates it as possibly safe, though information is incomplete. Data on breastfeeding isn't on file.

Talk with your healthcare provider about whether this product is right for you during pregnancy or while nursing.

Side effects, ingredient by ingredient Lactobacillus Acidophilus

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 — Lactobacillus Acidophilus.
  • 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.

Antibiotic drugs are the main medication type to double-check before taking this product — they can reduce the effectiveness of the live probiotics if you take them at the same time. Altogether, these interactions span 182 individual medications.

Ask your pharmacist for guidance on timing.

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.

UP4 Junior is a good choice if you're looking for a probiotic for digestive support, particularly for irritable bowel syndrome or antibiotic-associated diarrhea. If you're taking antibiotics, separate them from this powder — ask your pharmacist for the timing.

Check your medications on this page first, and talk with your doctor or pharmacist before you start, especially if you have a compromised immune system or serious health condition.

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 Dec 24, 2013.

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 Junior, straight from the product label.

Brand UP4
Net contents 60 Gram(s); 2.1 oz.
Market status On market
Date entered into DSLD Dec 24, 2013
DSLD ID 28819
Product type Non-nutrient/non-botanical
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Kosher, Halal, Gluten Free
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 Junior by UP4, 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:
0.25 tsp
Maximum serving Sizes:
0.25 tsp
Servings per container
60
IngredientAmount% DV
B. lactis0 Not Present--
A Proprietary Probiotic Blend18 mg--
L. acidophilus DDS(R)-10 Not Present--

Other ingredients: Rice Dextrin, Fructooligosaccharide, Silica

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.
FDA Statement of Identity

PROBIOTIC SUPPLEMENT

Brand IP Statement(s)

A HAPPIER INSIDE

Formula

PROBIOTICS with DDS-1

We start with exceptionally resilient, scientifically validated strains like Lactobacillus acidophilus DDS(R)-1 as a base for all of our formulas.

General Statements

5 BILLION CFU 2 MONTH SUPPLY ACID & BILE RESISTANT

SUPPORTS DIGESTIVE and IMMUNE HEALTH

~leading ~scientific ~healthy ~trusted UP4 learning more about the art, science and passion that goes into our products?

Laboratory tested to meet strict standards for potency and identity.

We add additional live cultures that can naturally withstand stomach acid and bile without the need for chemical coatings.

MADE IN USA

UP4 health. Our formulas are based on the researched and proven strains that promote the healthy bacteria in your body. With probiotics and your body in balance, the results are a happier inside.

UP4 trust. We stand on our legacy of quality. We’re dedicated to being a leader in the field and guarantee you will always get what is promised on our label. It’s what you’d expect from a company that’s all in for probiotics.

POWDER

UP4 leading. We’ve been making probiotics in the USA since 1979. And it’s all we do, from creating the formulas and manufacturing to getting our products to you. For us, it’s a science, an art and definitely our passion.

UP4 science. Not all probiotic strains are created equal.

Laboratory tested to meet strict standards for potency and purity. Potency guaranteed at time of expiration.

Formulation

NON-DAIRY NON-GMO GLUTEN FREE SOY FREE PRESERVATIVE FREE

VEGAN

Seals/Symbols

{crescent moon}M(R)

OK D

vitamin angels(R) PROUD SUPPORTER

Suggested/Recommended/Usage/Directions

DIRECTIONS: For best results mix 1/4 teaspoon with water or food. Consume soon after mixing.

Precautions

CAUTION: ~ Do not take if seal is broken

~ Keep out of reach of children

~ As with any supplement, if you are pregnant, nursing, have a medical condition or taking medication, consult your health practitioner before use

Storage

Room temperature stable for two years. Refrigerate after opening.

FDA Disclaimer Statement

This statement has 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

Junior by UP4 label

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

Junior 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 Junior by UP4

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

Serving size0.25 tsp Dosage formPowder Servings per container60 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.

A Proprietary Probiotic Blend

18 mg per serving

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

Interaction report

Junior by UP4 Drug Interactions

Want to check YOUR meds against Junior?

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

L. acidophilus DDS(R)-1 182

Individual Drug Interactions

The ingredients in Junior interact with 182 drugs. Click any drug to see the details.

1 of the 2 ingredients in Junior interact with drugs. Each result below shows which ingredient is responsible. L. acidophilus DDS(R)-1

Each ingredient & the kinds of drugs it affects

For each ingredient in Junior 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.

L. acidophilus DDS(R)-11 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking Lactobacillus acidophilus with antibiotic drugs might decrease the effectiveness of L. acidophilus.
L. acidophilus 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 L. acidophilus preparations by at least two hours.

Likelihood Probable Evidence D
L. acidophilus DDS(R)-1 full monograph & interactions
The maker

Brand information

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

UP4

See all UP4 products
Name
UASLifeSciences The Probiotic Company(R)
Street Address
555 N 72nd Avenue
City
Wausau
State
WI
ZipCode
54401
Phone Number
715.849.3333
Pharmacist Counseling Corner

Junior by UP4: Common Questions

Does Junior by UP4 interact with any medications?
Yes. Based on its ingredients, Junior 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?
Junior 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.
Should I take this at the same time as my antibiotic?
No — antibiotics kill the beneficial bacteria in probiotics, making them less effective. Separate your doses; your pharmacist can advise you on how long to wait between them.
Is this safe for kids?
L. acidophilus is generally well tolerated in children. Since this is a powder, make sure it's mixed well into food or liquid, and check the label for age recommendations.
What does this probiotic actually do?
The L. acidophilus in this powder is possibly effective for irritable bowel syndrome, antibiotic-associated diarrhea, Helicobacter pylori infection, and bacterial vaginosis. It works best as part of an overall digestive health routine.
Can I take this if I'm pregnant?
The L. acidophilus here is rated possibly safe in pregnancy, but data aren't complete. Talk with your doctor or midwife before starting to make sure it's right for you.
What are the side effects I should watch for?
Mild gastrointestinal discomfort — bloating, gas, diarrhea, or stomach upset — can happen, though it's rare. More serious infections are very uncommon and mainly happen in people with weakened immune systems. Let your doctor know if you have severe symptoms.

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.

Junior label
Go deeper

The Full Monographs Behind Junior’s Ingredients

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

Herb & supplement monograph

Lactobacillus Acidophilus

Interacts with 182 drugs

Lactobacillus acidophilus is a 'friendly' bacterium used as a probiotic to support gut and vaginal health. It is generally well tolerated in healthy people, and there is reasonable evidence...

Read the full Lactobacillus Acidophilus monograph →
Sources

Sources & How We Checked

Junior'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 15 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.

Lactobacillus Acidophilus 15 references
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Begtrup LM, de Muckadell OB, Kjeldsen J, Christensen RD, Jarbøl DE. Long-term treatment with probiotics in primary care patients with irritable bowel syndrome--a randomised, double-blind, placebo controlled trial. Scand J Gastroenterol 2013;48(10):1127-35 PubMed
  3. Chatterjee S, Kar P, Das T, Ray S, Gangulyt S, Rajendiran C, Mitra M. Randomised placebo-controlled double blind multicentric trial on efficacy and safety of Lactobacillus acidophilus LA-5 and Bifidobacterium BB-12 for prevention of antibiotic-associated
  4. Shavakhi A, Tabesh E, Yaghoutkar A, Hashemi H, Tabesh F, Khodadoostan M,Minakari M, Shavakhi S, Gholamrezaei A. The effects of multistrain probiotic compound on bismuth-containing quadruple therapy for Helicobacter pylori infection: a randomized placebo-c
  5. Karamali M, Dadkhah F, Sadrkhanlou M, et al. Effects of probiotic supplementation on glycaemic control and lipid profiles in gestational diabetes: a randomized, double-blind, placebo-controlled trial. Diabetes Metab 2016;42(4):234-41. PubMed
  6. Badehnoosh B, Karamali M, Zarrati M, et al. The effects of probiotic supplementation on biomarkers of inflammation, oxidative stress and pregnancy outcomes in gestational diabetes. J Matern Fetal Neonatal Med. 2018 May;31(9):1128-1136.
  7. Kumar S, Kumar R, Rohilla L, Jacob N, Yadav J, Sachdeva N. A high potency multi-strain probiotic improves glycemic control in children with new-onset type 1 diabetes mellitus: A randomized, double-blind, and placebo-controlled pilot study. Pediatr Diabete
  8. Shahriari A, Karimi E, Shahriari M, Aslani N, Khooshideh M, Arab A. The effect of probiotic supplementation on the risk of gestational diabetes mellitus among high-risk pregnant women: A parallel double-blind, randomized, placebo-controlled clinical trial PubMed
  9. Xiao SD, Zhang DZ, Lu H, et al. Multicenter, randomized, controlled trial of heat-killed Lactobacillus acidophilus LB in patients with chronic diarrhea. Adv Ther. 2003;20(5):253-60.
  10. 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
  11. Ozer M, Goksu SY, Shahverdiani A, Mustafa M. Lactobacillus acidophilus-induced endocarditis and associated splenic abscess. Case Rep Infect Dis 2020;2020:1382709.
  12. Sadrin S, Sennoune S, Gout B, et al. A 2-strain mixture of Lactobacillus acidophilus in the treatment of irritable bowel syndrome: A placebo-controlled randomized clinical trial. Dig Liver Dis 2020;52(5):534-540. PubMed
  13. Stoffer JN, Slingsby TJ, Giuliari GP. Lactobacillus acidophilus endophthalmitis after intravitreal bevacizumab injection requiring intraocular lens explantation. Can J Ophthalmol 2022;57(1):e21-e22. PubMed
  14. Cukovic-Cavka S, Likic R, Francetic I, Rustemovic N, Opacic M, Vucelic B. Lactobacillus acidophilus as a cause of liver abscess in a NOD2/CARD15-positive patient with Crohn's disease. Digestion 2006;73(2-3):107-10.
  15. Hui J, Ren Y, Wang Y, Han Q. Lactobacillus acidophilus endophthalmitis postcataract operation: A case report with a literature review. Ocul Immunol Inflamm 2023.

See these in context on the Lactobacillus Acidophilus 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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