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

SunFiber Ingredients & Drug Interactions

by Tomorrow's Nutrition Pro

SunFiber label
See full label image
Powder Category: Fiber And Other Nutrients
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 SunFiber 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

SunFiber is a dietary supplement by Tomorrow's Nutrition Pro with 2 active ingredients. Its ingredients are commonly taken for constipation and bowel regularity, diarrhea (as a stool bulking agent), lowering cholesterol.Based on those ingredients, 2,025 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Sunfiber. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against SunFiber by Tomorrow's Nutrition Pro

Ask about any prescription or over-the-counter medication and we check it for interactions with SunFiber by Tomorrow's Nutrition Pro — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of SunFiber by Tomorrow's Nutrition Pro

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

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.

SunFiber by Tomorrow's Nutrition Pro is a 2-ingredient powder; both are the same active ingredient — guar gum, a soluble fiber extracted from guar beans. The product contains no inactive fillers or other ingredients listed.

Guar gum works as a dietary fiber that dissolves in water and moves through your digestive tract. It's used to help manage blood sugar, cholesterol, bowel regularity, and symptoms of irritable bowel syndrome.

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 health and bowel regularity.
  • We looked for evidence on: Constipation, Irritable bowel syndrome (IBS), Hypercholesterolemia, Diabetes, diarrhea, prebiotic — and 1 related terms.
  • The strongest evidence on file: Guar Gum is rated "Possibly Effective" for Constipation (Natural Medicines).
  • Also on file: Guar Gum is rated "Possibly Effective" for Hypercholesterolemia, Irritable bowel syndrome (IBS).
  • Also on file: Guar Gum is rated "Insufficient Reliable Evidence To Rate" for Chemotherapy-induced diarrhea, Diabetes.

The evidence for guar gum is limited but hopeful. It's rated possibly effective for high blood pressure, high cholesterol, irritable bowel syndrome, and constipation.

That means there's some clinical support for these uses, but the evidence isn't conclusive yet. Talk with your doctor about whether it fits your specific situation.

The evidence, ingredient by ingredient Guar Gum

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.

Guar gum is generally well tolerated as a food, but when taken as a supplement concentrate, you must have plenty of water with it — without enough fluid, it can cause serious blockage in your esophagus or small intestine. Common side effects include belly pain, bloating, diarrhea, gas, and heartburn; starting with small doses and gradually increasing can minimize these.

Safety data on supplement doses during pregnancy is limited, so use caution and talk with your doctor if you're pregnant or planning to be. If you're breastfeeding, there's no lactation safety information on file for this ingredient.

Side effects, ingredient by ingredient Guar Gum

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 — Guar Gum.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: heart-rhythm medications.
  • For scale: 2,026 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 you take SunFiber, check with your pharmacist if you're on antibiotics (like penicillin), diabetes medications (like metformin), birth control containing ethinyl estradiol, or any other oral medications. Guar gum can reduce how much of these drugs your body absorbs, and Moderate interactions are documented.

Heart medications like digoxin require spacing too, though the effect is Minor. The simple fix is taking guar gum 30 to 60 minutes after your medications.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

SunFiber may help with blood sugar, cholesterol, bowel regularity, or IBS symptoms, but the evidence is promising rather than proven. It's safe for most people if you drink plenty of water with it — that's the key to avoiding serious blockage.

If you take any medications, especially antibiotics, diabetes drugs, or birth control, space guar gum out by at least 30 to 60 minutes and ask your pharmacist to check your specific list first.

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

Assessment coverage: 2 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Jul 24, 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

At a glance

General information

Key facts about SunFiber, straight from the product label.

Brand Tomorrow's Nutrition Pro
Barcode (UPC) 850236004187
Net contents 0.48 Pound(s); 7.7 Ounce(s); 217 Gram(s)
Market status On market
Date entered into DSLD Jul 24, 2025
DSLD ID 336303
Product type Fiber And Other Nutrients
Supplement form Powder
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Kosher, Gluten Free, Dairy 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 SunFiber by Tomorrow's Nutrition Pro, 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:
7 Gram(s)
Maximum serving Sizes:
7 Gram(s)
Servings per container
31
UPC/BARCODE
850236004187
IngredientAmount% DV
Calories15 Calorie(s)--
Total Carbohydrates7 Gram(s)3%
Total Sugars0 Gram(s)--
Sunfiber6 Gram(s)21%
Sunfiber7 Gram(s)--

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

Tomorrow's Nutrition Pro Sunfiber delivers 6 grams of clinically proven, clear, grit-free soluble fiber. True regulating all-natural fiber Proven prebiotic

Invisible fiber visible benefits True regulating all-natural fiber Proven prebiotic

One serving of this product is low in FODMAPs.

OK (Kosher)

Formulation

Grade A level 1 evidence consensus recommendation Improves both occasional constipation and diarrhea without excess gas, cramping or bloating Low FODMAP certified Promotes intestinal and colon health Helps reduce the glycemic index of foods Delivers healthy satiety effect Tomorrow's Nutrition Pro Sunfiber dissolves fast and clear in your favorite beverage and won't alter the taste or texture of foods.

Promotes digestive health Dissolves fast & clear No grit, no taste

Non GMO Project Verified nongmoproject.org

Monash University Low FODMAP Certified.

Gluten free Non-dairy Non-GMO BPA free bottle

Vegan

Suggested/Recommended/Usage/Directions

Sunfiber may be added to recipes when cooking and baking. Simply stir in Sunfiber until dissolved.

Recommendations: As a dietary supplement, mix approximately one scoop (7 g) into 6-8 ounces of water or any non-carbonated beverage.

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.

Precautions

Warning: If pregnant, nursing, or taking prescription drugs, consult your healthcare practitioner prior to use.

A low FODMAP diet does not treat a disease but may help to meet nutritional needs with reduced gastrointestinal symptoms.

Do not use if safety seal is broken or missing.

Keep out of the reach of children.

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

Non GMO Project Verified nongmoproject.org Monash University Low FODMAP Certified

OK (Kosher)

Brand IP Statement(s)

Monash University receives a license fee for use of the Monash University Low FODMAP Certified trademarks.

Sunfiber is a registered trademark of Taiyo International, Inc.

Storage

Store in a cool dry place.

Notice: This product is sold by weight, not by volume. Contents may settle during shipping and handling.

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

See for yourself

SunFiber by Tomorrow's Nutrition Pro label

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

SunFiber 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 SunFiber by Tomorrow's Nutrition Pro

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

Serving size7 Gram(s) Dosage formPowder Servings per container31 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.

Sunfiber

Interacts with
2,025 drugs
6 Gram(s) per serving Form: Dietary Fiber

Guar gum is a soluble, gel-forming fiber from the guar bean that may modestly help with cholesterol, blood sugar, and bowel regularity. It is generall...

Sunfiber monograph & interactions

Sunfiber

Interacts with
2,025 drugs
7 Gram(s) per serving Form: Guar Fiber

Guar gum is a soluble, gel-forming fiber from the guar bean that may modestly help with cholesterol, blood sugar, and bowel regularity. It is generall...

Sunfiber monograph & interactions
Interaction report

SunFiber by Tomorrow's Nutrition Pro Drug Interactions

Want to check YOUR meds against SunFiber?

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
2,025Drugs
2,025 Moderate

Ingredients driving the most interactions

Sunfiber 2,025

Individual Drug Interactions

The ingredients in SunFiber interact with 2,025 drugs. Click any drug to see the details.

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

Each ingredient & the kinds of drugs it affects

For each ingredient in SunFiber 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.

Sunfiber5 drug types · 2,025 drugs

Ethinyl Estradiol

Theoretically, guar gum might reduce the absorption of ethinyl estradiol, potentially decreasing its effectiveness.
Animal research shows that taking guar gum with ethinyl estradiol decreases ethinyl estradiol absorption. However, this effect has not been reported in humans.

Likelihood Possible Evidence D
Metformin (Glucophage)

Guar gum might reduce the absorption of metformin, potentially decreasing its effectiveness.
A small study in healthy volunteers shows that guar gum reduces the absorption rate of metformin.

Likelihood Probable Evidence B
Oral Drugs

Guar gum might reduce the absorption of some oral drugs, potentially decreasing their effectiveness.
Clinical research shows that guar gum reduces or slows absorption of medications such as penicillin and metformin. To avoid changes in absorption, take guar gum 30-60 minutes after oral medications.

Likelihood Possible Evidence B
Penicillin

Guar gum might reduce the absorption of penicillin, potentially decreasing its effectiveness.
A small clinical study in healthy volunteers shows that taking guar gum with penicillin results in decreased penicillin absorption and reduced penicillin levels.

Likelihood Probable Evidence B
Digoxin (Lanoxin)

Guar gum might slow digoxin absorption, but it does not seem to impact how much digoxin is absorbed overall.
Two small studies in healthy volunteers show no change in the overall extent of digoxin absorption, although early absorption was slowed, when taken with guar gum.

Likelihood Possible Evidence B
Sunfiber full monograph & interactions
The maker

Brand information

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

Tomorrow's Nutrition Pro

See all Tomorrow's Nutrition Pro products
Name
Tomorrow's Nutrition Pro
City
Minneapolis
State
MN
Phone Number
888.380.2322
Pharmacist Counseling Corner

SunFiber by Tomorrow's Nutrition Pro: Common Questions

Does SunFiber by Tomorrow's Nutrition Pro interact with any medications?
Yes. Based on its ingredients, SunFiber has a known interaction with 2,025 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
SunFiber 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.
Will this help my IBS or constipation?
Guar gum is rated possibly effective for both irritable bowel syndrome and constipation, which means there's some clinical support for these uses. It's not a proven cure, but it may help — talk with your doctor about whether it's right for your situation.
What side effects should I expect?
The most common are belly pain, bloating, diarrhea, gas, and heartburn. Starting with a small dose and gradually increasing it can help minimize these. In rare cases, if you don't drink enough water with it, it can cause serious blockage, so plenty of fluid is essential.
Can I take this if I'm pregnant or breastfeeding?
Pregnancy safety data on supplement doses is limited, so talk with your doctor before using it. There's no lactation safety information on file for this ingredient either — ask your pharmacist or doctor for personalized advice.
How much water do I need to take with it?
The facts stress "lots of water" to avoid choking or blockage, and recommend spacing guar gum 30 to 60 minutes away from medications. Your pharmacist or the package label can give you the exact amount for your dose.
Will it lower my cholesterol or blood pressure?
Guar gum is rated possibly effective for both high cholesterol and high blood pressure, meaning there's some evidence it may help. It's not a substitute for medications, though — talk with your doctor about how it fits into your overall plan.

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

Not sure if SunFiber is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

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.

SunFiber label
Go deeper

The Full Monographs Behind SunFiber’s Ingredients

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

Herb & supplement monograph

Guar Gum

Interacts with 2,025 drugs

Guar gum is a soluble, gel-forming fiber from the guar bean that may modestly help with cholesterol, blood sugar, and bowel regularity. It is generally safe in food amounts, but concentrated...

Read the full Guar Gum monograph →
Sources

Sources & How We Checked

SunFiber'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 26 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.

Guar Gum 26 references
  1. Gin H, Orgerie MB, Aubertin J. The influence of Guar gum on absorption of metformin from the gut in healthy volunteers. Horm Metab Res 1989;21:81-3.
  2. Huupponen R, Seppala P, Iisalo E. Effect of guar gum, a fibre preparation, on digoxin and penicillin absorption in man. Eur J Clin Pharmacol 1984;26:279-81. PubMed
  3. Malo JL, Cartier A, L'Archeveque J, et al. Prevalence of occupational asthma and immunologic sensitization to guar gum among employees at a carpet-manufacturing plant. J Allergy Clin Immunol 1990;86:562-9. PubMed
  4. Lagier F, Cartier A, Somer J, et al. Occupational asthma caused by guar gum. J Allergy Clin Immunol 1990;85:785-90.
  5. Lewis JH. Esophageal and small bowel obstruction from guar gum-containing diet pills: analysis of 26 cases reported to the FDA. Am J Gastroenterol 1992;87:1424-8.
  6. Vuorinen-Markkola H, Sinisalo M, Koivisto VA. Guar gum in insulin-dependent diabetes: effects on glycemic control and serum lipoproteins. Am J Clin Nutr 1992;56:1056-1060. PubMed
  7. Superko HR, Haskell WL, Sawrey-Kubicek L, Farquhar JW. Effects of solid and liquid guar gum on plasma cholesterol and triglyceride concentrations in moderate hypercholesterolemia. Am J Cardiol 1988;62:51-5. PubMed
  8. Garcia JJ, Fernandez N, Diez MJ, et al. Influence of two dietary fibers in the oral bioavailability and other pharmacokinetic parameters of ethinyloestradiol. Contraception 2000;62:253-7. PubMed
  9. Groop PH, Aro A, Stenman S, Groop L. Long-term effects of guar gum in subjects with non-insulin-dependent diabetes mellitus. Am J Clin Nutr 1993;58:513-8. PubMed
  10. Chuang LM, Jou TS, Yang WS, et al. Therapeutic effect of guar gum in patients with non-insulin-dependent diabetes mellitus. J Formos Med Assoc 1992;91:15-9.
  11. Ebeling P, Yki-Jarvinen H, Aro A, et al. Glucose and lipid metabolism and insulin sensitivity in type 1 diabetes: the effect of guar gum. Am J Clin Nutr 1988;48:98-103. PubMed
  12. Scheen AJ. Clinical pharmacokinetics of metformin. Clin Pharmacokinet 1996;30:359-71. PubMed
  13. Knopp RH, Superko HR, Davidson M, et al. Long-term blood cholesterol-lowering effects of a dietary fiber supplement. Am J Prev Med 1999;17:18-23. PubMed
  14. Patrick PG, Gohman SM, Marx SC, et al. Effect of supplements of partially hydrolyzed guar gum on the occurrence of constipation and use of laxative agents. J Am Diet Assoc 1998;98:912-4. PubMed
  15. Osterlund P, Ruotsalainen T, Korpela R, et al. Lactobacillus supplementation for diarrhoea related to chemotherapy of colorectal cancer: a randomised study. Br J Cancer 2007;97:1028-34. PubMed
  16. Lembcke B, Hasler K, Kramer P, et al. Plasma digoxin concentrations during administration of dietary fibre (guar gum) in man. Z Gastroenterol 1982;20;164-7.
  17. Riikonen, S., Savonius, H., Gylling, H., Nikkila, K., Tuomi, A. M., and Miettinen, T. A. Oral guar gum, a gel-forming dietary fiber relieves pruritus in intrahepatic cholestasis of pregnancy. Acta Obstet.Gynecol.Scand. 2000;79(4):260-264. DOI
  18. Kovacs, E. M., Westerterp-Plantenga, M. S., Saris, W. H., Goossens, I., Geurten, P., and Brouns, F. The effect of addition of modified guar gum to a low-energy semisolid meal on appetite and body weight loss. Int.J.Obes.Relat Metab Disord. 2001;25(3):307 PubMed
  19. Halama, W. H. and Mauldin, J. L. Distal esophageal obstruction due to a guar gum preparation (Cal-Ban 3000). South.Med.J. 1992;85(6):642-645. PubMed
  20. Landin, K., Holm, G., Tengborn, L., and Smith, U. Guar gum improves insulin sensitivity, blood lipids, blood pressure, and fibrinolysis in healthy men. Am.J.Clin.Nutr. 1992;56(6):1061-1065. PubMed
  21. Cicero, A. F., Derosa, G., Manca, M., Bove, M., Borghi, C., and Gaddi, A. V. Different effect of psyllium and guar dietary supplementation on blood pressure control in hypertensive overweight patients: a six-month, randomized clinical trial. Clin.Exp.Hyp PubMed
  22. Simons LA, Gayst S, Balasubramaniam S, Ruys J. Long-term treatment of hypercholesterolaemia with a new palatable formulation of guar gum. Atherosclerosis 1982;45:101-108. PubMed
  23. Salenius JP, Harju E, Jokela H, et al. Long term effects of guar gum on lipid metabolism after carotid endarterectomy. BMJ 1-14-1995;310:95-96. PubMed
  24. Gylling, H., Riikonen, S., Nikkila, K., Savonius, H., and Miettinen, T. A. Oral guar gum treatment of intrahepatic cholestasis and pruritus in pregnant women: effects on serum cholestanol and other non-cholesterol sterols. Eur.J.Clin.Invest 1998;28(5):35 PubMed
  25. Brillantino A, Iacobellis F, Izzo G, et al. Maintenance therapy with partially hydrolyzed guar gum in the conservative treatment of chronic anal fissure: results of a prospective, randomized study. Biomed Res Int 2014;2014:964942. PubMed
  26. Polymeros D, Beintaris I, Gaglia A, et al. Partially hydrolyzed guar gum accelerates colonic transit time and improves symptoms in adults with chronic constipation. Dig Dis Sci 2014;59(9):2207-14. PubMed

See these in context on the Guar Gum 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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