FOS Ingredients & Drug Interactions
by BioCare
What is this page for?
First and foremost: checking FOS 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
FOS is a dietary supplement by BioCare with 1 active ingredient. Its ingredients are commonly taken for digestive and gut health, prebiotic to support good bacteria, constipation relief.We don’t currently list a known drug interaction for its mapped ingredients — but that doesn’t guarantee none exist, so always confirm with your pharmacist.
HelloPharmacist Scorecard of FOS by BioCare
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.
What’s inside
Full disclosure
This product contains one active ingredient: fructooligosaccharides (FOS), a soluble fiber that your gut bacteria ferment. It's the kind of fiber found naturally in foods like onions, garlic, and asparagus.
Does it work?
Not established
The evidence for FOS is not yet established in the data we hold. We don't have reliable evidence to rate it for osteoporosis, constipation, diabetes, travelers' diarrhea, or cholesterol.
If you're considering it for one of these, talk with your doctor about what the science actually shows and whether it makes sense for you.
How safe is it?
Well-documented data
FOS is generally well tolerated in the amounts you'd eat in food. At supplement doses, the main side effects are digestive: abdominal pain, bloating, gas, and belching.
A review of small studies found that doses from 2.5 to 15 grams daily for up to 8 weeks didn't increase these symptoms more than placebo, though they can happen at higher doses or in sensitive people. Safety data for long-term supplement use is limited, so use it only with your doctor's guidance.
Meds to double-check
No known interactions
No interactions are documented in our data for the ingredient we could check. That doesn't mean none exist—always run your exact medication list through the search tool on this page, or ask your pharmacist if you're unsure.
The bottom line
Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. No medication interactions are currently documented, and safety information is well characterized.
If you're looking for a soluble fiber supplement and your medications don't interact with anything, FOS is generally well tolerated—just watch for gas and bloating, especially when you start. We don't yet know how well it works for the conditions it's marketed for, so talk with your doctor before relying on it for a health goal.
Check your exact medications on this page before you buy.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Aug 22, 2025.
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
General information
Key facts about FOS, straight from the product label.
| Brand | BioCare |
|---|---|
| Barcode (UPC) | 5033290291259 |
| Net contents | 250 Gram(s) |
| Market status | On market |
| Date entered into DSLD | Aug 22, 2025 |
| DSLD ID | 336041 |
| Product type | Fiber And Other Nutrients |
| Supplement form | Powder |
| Dietary claims / uses | Nutrient, All Other |
| Intended target group(s) | Vegan, Vegetarian, Adult (18 - 50 Years), Dairy Free |
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 FOS by BioCare, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Fructooligosaccharides | 10 Gram(s) | -- |
Other ingredients: Fructooligosaccharides
Tap any ingredient to jump to its full detail below.
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.
Suggested/Recommended/Usage/Directions
Directions: 1 tablespoon (approx. 10g), taken daily, or as professionally directed. Sprinkle onto cereal or fresh fruit, or blend into yoghurt or fruit juice.
Precautions
This product should not be used as a substitute for a varied diet and healthy lifestyle. Do not exceed the stated recommended daily intake. Do not purchase if the seal is broken. If you are under medical supervision, please consult a doctor before use. Consumption may initially cause wind and bloating.
Keep out of reach of children.
Storage
Contains a desiccant to absorb moisture.
General Statements
For best before and batch, see base.
Formulation
Vegetarian & vegan
Formula
High potency soluble fibre as fructooligosaccharides
FDA Statement of Identity
Food Supplement
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
FOS by BioCare label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
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)The Ingredients in FOS by BioCare
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size10 Gram(s) Dosage formPowder Amounts shown are per serving.
Fructooligosaccharides
No knowninteractions
Fructo-oligosaccharides (FOS) are a type of soluble fiber that acts as a prebiotic, meaning they feed the helpful bacteria in your gut. They are gener...
Fructooligosaccharides monograph & interactionsOther (inactive) ingredients: Fructooligosaccharides. These complete the product’s ingredient list but are not active constituents.
FOS by BioCare Drug Interactions
We don’t currently list any known drug interactions for the mapped ingredients in FOS. This doesn’t guarantee none exist — always confirm with your pharmacist before combining a supplement with your medications.
Brand information
Manufacturer and brand details for FOS, from the product label.
BioCare
See all BioCare products- Name
- UK - BioCare Ltd
- Street Address
- 1 Hedera Road
- State
- Redditch
- ZipCode
- B98 9EY
- Phone Number
- +44 0121 433 3727
- Web Address
- www.biocare.co.uk
FOS by BioCare: Common Questions
Does FOS by BioCare interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What does FOS actually do?
Will this cause gas or bloating?
Is it safe to take while pregnant or breastfeeding?
Does it interact with my medications?
Is this safe to use long-term?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if FOS is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
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.
The Full Monographs Behind FOS’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
FOS'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.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
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 6 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.
Fructo-oligosaccharides (fos) 6 references
- Briet F, et al. Symptomatic response to varying levels of fructo-oligosaccharides consumed occasionally or regularly. Eur J Clin Nutr 1995;49:501-7.
- Bouhnik Y, Vahedi K, Achour L, et al. Short-chain fructo-oligosaccharide administration dose-dependently increases fecal bifidobacteria in healthy humans. J Nutr 1999;129:113-6. PubMed
- Cummings JH, Macfarlane GT, Englyst HN. Prebiotic digestion and fermentation. Am J Clin Nutr 2001;73:415S-420S. PubMed
- Souza DDS, Tahan S, Weber TK, Araujo-Filho HB, de Morais MB. Randomized, double-blind, placebo-controlled parallel clinical trial assessing the effect of fructooligosaccharides in infants with constipation. Nutrients. 2018;10(11). pii: E1602. PubMed
- Andermann TM, Fouladi F, Tamburini FB, et al. A Fructo-Oligosaccharide Prebiotic Is Well Tolerated in Adults Undergoing Allogeneic Hematopoietic Stem Cell Transplantation: A Phase I Dose-Escalation Trial. Transplant Cell Ther 2021;27(11):932. PubMed
- Dou Y, Yu X, Luo Y, Chen B, Ma D, Zhu J. Effect of Fructooligosaccharides Supplementation on the Gut Microbiota in Human: A Systematic Review and Meta-Analysis. Nutrients 2022;14(16):3298. PubMed
See these in context on the Fructo-oligosaccharides (fos) 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