What is D-mannose? It is a simple sugar, a close chemical cousin of glucose, found in small amounts in fruits such as cranberries, apples and peaches. Unlike most sugars, very little of it is used for energy: much of it is absorbed and then passed into the urine largely unchanged, which is why it is sold for urinary tract health. D-Mannose+ pairs 1,000 mg of D-mannose with cranberry, hibiscus and dandelion in a two-capsule serving taken once a day.*
Key takeaways
- D-mannose is a simple sugar that the body absorbs and passes largely unchanged into the urinary tract.
- Each two-capsule serving of D-Mannose+ provides 1,000 mg of D-mannose, 150 mg of cranberry juice powder, 100 mg of hibiscus flower extract and 100 mg of dandelion root extract.
- The D-Mannose+ label says: "Do not exceed recommended dose. Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement."
- Research is limited: a 2022 Cochrane review rated the evidence very low certainty, and a 2024 JAMA Internal Medicine trial in women with repeat urinary tract infections found that 2 grams a day of D-mannose powder, twice the 1,000 mg in a D-Mannose+ serving, did not reduce the share who had another suspected infection.
- Because D-mannose is a sugar, D-Mannose+ is not sugar-free.
- Burning, fever, back pain or blood in the urine are reasons to see a clinician, not reasons to add a supplement.
What is D-mannose, in plain terms?
D-mannose is a monosaccharide, a single sugar unit, like glucose and fructose. Your body makes a little of it and uses it to build glycoproteins, the sugar-coated proteins found on cell surfaces. Food supplies more: cranberries, blueberries, apples, peaches and oranges all contain small amounts.
What makes it different from table sugar is how the body handles it. D-mannose is absorbed in the gut, but the body converts only a small share of it into energy and passes much of it into the urine largely unchanged. That journey is the reason it shows up in urinary-wellness formulas, and the reason it is usually taken with a full glass of water.
Researchers are still studying how it behaves in the urinary tract. It is not an antibiotic, it is not a drug, and it is not a substitute for a clinician when something feels wrong.
What does the research on D-mannose actually show?
A 2022 Cochrane review of seven small randomized trials in adults with bladder infections or repeat urinary tract infections rated the evidence very low certainty and found little to no evidence to support or refute D-mannose for preventing or treating these infections; the authors called for an adequately powered trial comparing D-mannose with a placebo. In a 2024 JAMA Internal Medicine trial, 598 women with repeat urinary tract infections took 2 grams of D-mannose powder or a placebo daily for six months. D-mannose did not reduce the share who had another suspected infection (51.0% vs 55.7% with the placebo), and the authors concluded it should not be recommended for prevention in that group.
The amount matters too. The 2024 trial gave 2 grams a day, twice the 1,000 mg in one serving of D-Mannose+, and the Cochrane authors found that no two trials in their review were comparable by dose or treatment. So study results describe the amounts those groups took, not what a 1,000 mg serving will do. We would rather tell you that plainly than borrow a study's numbers for our label.
Cranberry has its own long-standing association with urinary tract health. NCCIH says its effectiveness "is still in question because of inconsistent findings," and studies in different groups of people have reached different results.
Meet D-Mannose+: what is on the label
D-Mannose+ has four active ingredients, and every amount is printed on the label. Each two-capsule serving of D-Mannose+ provides 1,000 mg of D-mannose, 150 mg of cranberry juice powder, 100 mg of hibiscus flower extract and 100 mg of dandelion root extract.
| Ingredient (per 2-capsule serving) | Amount | Its role in the formula |
|---|---|---|
| D-mannose | 1,000 mg | Supports urinary tract health and helps maintain urinary comfort.* |
| Cranberry juice powder (Vaccinium macrocarpon), fruit | 150 mg | Works with D-mannose to promote a healthy bladder environment.* |
| Hibiscus flower extract (Hibiscus sabdariffa) | 100 mg | Encourages natural detoxification and fluid balance.* |
| Dandelion root extract (Taraxacum officinale) | 100 mg | Encourages natural detoxification and fluid balance.* |
The other ingredients are a hypromellose (vegetable) capsule, magnesium stearate and silicon dioxide. The formula is gluten-free, non-GMO, vegan and caffeine-free. Because D-mannose is a sugar, D-Mannose+ is not sugar-free. If you track sugar closely, count it.
For a closer look at why hibiscus and dandelion sit beside D-mannose, see Hibiscus and Dandelion in Urinary Supplements: What They Add.
How to take D-Mannose+
The label direction is simple: take two veggie capsules once a day, ideally 20 to 30 minutes before a meal with an 8 oz glass of water, or as directed by your healthcare professional. The 60-capsule bottle is a 30-day supply at that serving.
- Pick one anchor. Before breakfast or before dinner both work; choose the one you will remember every day.
- Drink the full glass. The water is part of the direction, not a suggestion.
- Do not double up. The label says not to exceed the recommended dose, and taking more does not turn a 1,000 mg serving into a study amount.
- Keep everyday habits. Hydration, not holding urine for long stretches and limiting bladder irritants all matter; our guide to everyday habits for urinary comfort covers them.
Prefer powder? D-Mannose Capsules vs. Powder: Which Form Fits Your Routine? compares the two forms fairly. Wondering about daily use? Is It Safe to Take D-Mannose Every Day? What the Research Says walks through what is known.
Who should check with a clinician first?
The D-Mannose+ label warning reads: "Keep out of reach of children. Do not use if safety seal is damaged or missing. Store in a cool, dry place. Caution: Do not exceed recommended dose. Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement."
A few more practical points. If you manage blood sugar, ask your clinician how a daily gram of sugar fits your plan. If you take warfarin, NCCIH notes conflicting evidence on whether cranberry interacts with it, so check before adding a cranberry product. For dandelion, NCCIH notes theoretical reasons to suspect it might interact with antidiabetes, anticoagulant (blood thinner), antiplatelet and water pill drugs, among others, and conflicting evidence on whether it causes an allergic reaction in people sensitive to related plants such as ragweed, chrysanthemums, marigolds and daisies. If you take any of these medicines or have those allergies, talk with your clinician before using D-Mannose+.
Burning, fever, back pain or blood in the urine are reasons to see a clinician, not reasons to add a supplement. D-Mannose+ is designed for everyday support, not for a problem that needs care now.
Why the label and the testing matter
A urinary formula is only as honest as its label. D-Mannose+ prints all four amounts, so you can compare it with any other product line by line. Every batch is third-party tested for purity and potency by an outside lab, and it is manufactured in USA with globally sourced materials in an NSF-certified, GMP-certified, FDA-registered facility. Read how that works on our standards page, or see a real test report explained in How to Read a Supplement Certificate of Analysis (COA).
Frequently asked questions about D-mannose
What is D-mannose made from?
D-mannose is a simple sugar found naturally in small amounts in fruits such as cranberries and apples. Chemically it is very close to glucose, but the body handles it differently, passing much of it into the urine.
Is D-mannose a diuretic?
D-mannose itself is not classed as a diuretic; it is a sugar that is filtered into the urine. D-Mannose+ also contains hibiscus and dandelion, which the formula includes to encourage natural detoxification and fluid balance.* NCCIH notes theoretical reasons to suspect that dandelion might interact with water pill drugs, as well as antidiabetes, anticoagulant (blood thinner) and antiplatelet drugs, so if you take any of these, ask your clinician before using D-Mannose+.
How much D-mannose is in D-Mannose+?
Each two-capsule serving provides 1,000 mg of D-mannose, along with 150 mg of cranberry juice powder, 100 mg of hibiscus and 100 mg of dandelion. The bottle holds 60 capsules, a 30-day supply at the directed serving. The label says: "Do not exceed recommended dose. Pregnant or nursing mothers, children under the age of 18, and individuals with a known medical condition should consult a physician before using this or any dietary supplement."
Does the research dose match D-Mannose+?
No, and we say so on purpose. A 2024 JAMA Internal Medicine trial gave women with repeat urinary tract infections 2 grams a day of D-mannose powder, twice the amount in one serving of D-Mannose+, and a 2022 Cochrane review found that no two of its trials were comparable by dose or treatment. Study results describe the amounts and groups studied, not what this formula will do for you.
Can I use D-mannose instead of seeing a doctor?
No. D-mannose is a dietary supplement for everyday urinary tract support, not a replacement for medical care. Pain, burning, fever, back pain or blood in the urine call for a clinician.
Related reading from our Wellness Hub
- D-Mannose vs. Cranberry: How They Differ for Urinary Wellness
- Foods and Drinks That Irritate the Bladder: A Practical List
- Third-Party Tested, Every Batch: Here’s the Receipt
Sources
- Cochrane Database of Systematic Reviews: Cooper TE, et al. D-mannose for preventing and treating urinary tract infections (2022)
- JAMA Internal Medicine: Hayward G, et al. d-Mannose for Prevention of Recurrent Urinary Tract Infection Among Women: A Randomized Clinical Trial (2024)
- NCCIH: Cranberry, updated November 2024
- NCCIH: Dandelion, updated November 2024
Individual results vary.
*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.
