- Health advice
- Nov 06, 2026
Last updated: 6 November 2026
Quick answer
Cranberry has the strongest research support of the common bladder supplements, and it may lower the risk of repeat urinary tract infections (UTIs) in women prone to them and in children. For your kidneys, drinking water, eating a balanced diet and having regular kidney health checks are the foundations, as no single vitamin has been proven to protect them.
- Cranberry may lower the risk of repeat UTIs in women prone to them and in children, based on moderate-certainty evidence.
- Cranberry does not treat a UTI that has already started, so see your GP if you have symptoms.
- D-mannose did no better than a placebo in a large 2024 trial.
- Keep vitamin C supplements to 1,000 mg a day or less, as high doses are linked to kidney stones in men.
Our top pick: Herbs of Gold Cranberry 70000, a vegan one-a-day cranberry tablet with vitamin C.
How this guide was put together: Reviewed by Yurie Sato (BHSc Naturopathy) against current research, including Cochrane reviews, randomised controlled trials, TGA guidance, healthdirect and Better Health Channel information, Kidney Health Australia resources and NIH NCCIH fact sheets, and updated as new evidence emerges. See our editorial policy or meet our practitioners.
What do your kidneys and bladder do?
Your kidneys filter waste and extra fluid out of your blood and turn it into urine. Your bladder stores that urine until you are ready to go to the toilet.
Explore your urinary system
Tap the kidneys or the bladder to learn more.
Kidney problems are easy to miss. Kidney Health Australia notes you can lose up to 90 per cent of kidney function before you notice any symptoms.
Which supplements may support bladder health?
Cranberry (Vaccinium macrocarpon) is a small red berry from North America. Native American peoples ate it, used it in wound poultices and used its juice as a dye, and sailors later carried barrels of cranberries on long voyages to help prevent scurvy.
Cranberry has been tested in around 50 clinical trials. Most of this research looks at lowering the risk of UTIs coming back.
How does cranberry work?
Cranberries contain plant compounds called proanthocyanidins, or PACs for short. A special type, called A-type PACs, helps stop E. coli bacteria from sticking to the inside wall of the urinary tract.
See it in action
Cranberry is not thought to work mainly by killing bacteria. Instead, bacteria that cannot stick are less able to multiply and cause an infection.
What does the research say about cranberry and UTIs?
A 2023 Cochrane review pooled 50 studies with almost 9,000 people. It found moderate-certainty evidence that cranberry products lowered the overall risk of a UTI by about 30 per cent.
Lower UTI risk with cranberry, by group
Hover or tap a row for the details.
Stomach side effects were no more common than with a placebo (a dummy pill). Cranberry is for prevention, not treatment, and it is not recommended for a UTI that has already started.
Not every health body reads the evidence the same way. Healthdirect describes the evidence for cranberry products as conflicting and suggests talking to your doctor before trying them.
Can cranberry help men with urinary symptoms?
Lower urinary tract symptoms (LUTS) include a weak stream, needing to go often and getting up at night to wee. In men, these symptoms are often linked to the prostate gland.
A small 2010 trial of 42 Czech men found that 1,500 mg of dried cranberry powder a day for six months eased urinary symptoms compared with no treatment. A larger follow-up trial of 124 men over 45 found 500 mg of cranberry powder a day improved symptom scores more than a placebo.
These are promising early results from one research group, so the evidence is still limited. Men with new urinary changes should see their GP first to rule out prostate problems.
What about D-mannose and vitamin C?
D-mannose is a natural sugar that is often sold for bladder health. Vitamin C is often added to bladder formulas, so it is worth knowing where each one stands.
Compare the evidence
A Cochrane review of 50 studies found cranberry may lower the risk of repeat UTIs in women prone to them, children and people after some medical procedures. It is not a treatment for an active UTI.
A 2022 Cochrane review found very low-certainty evidence and could not say whether D-mannose works. A 2024 trial of 598 UK women taking 2 g a day found about 51 per cent needed medical care for a UTI, compared with about 56 per cent on a placebo, which was not a meaningful difference.
Vitamin C is important for general health, but high-dose supplements have no proven kidney or bladder benefit. A Swedish study of more than 23,000 men over 11 years found those taking vitamin C supplements had about twice the risk of kidney stones.
View as a table
| Supplement | What the research shows | Strength of evidence | Safety notes |
|---|---|---|---|
| Cranberry | May lower the risk of repeat UTIs in women prone to them, children and people after some medical procedures | Moderate, based on a Cochrane review of 50 studies | Not a treatment for an active UTI. Check with your doctor if you take warfarin or have had kidney stones |
| Cranberry for men's urinary symptoms | Eased urinary symptoms in two trials | Low, with two trials from one research group | See your GP first to rule out prostate problems |
| D-mannose | Did not prevent repeat UTIs better than a placebo in a large trial | Not supported by a Cochrane review or a large 2024 trial | See your GP if UTIs keep coming back |
| High-dose vitamin C | No proven kidney or bladder benefit | Not supported | Linked to kidney stones in men. Do not exceed 1,000 mg a day from supplements |
Australian adults need about 45 mg of vitamin C a day. Australian advice is not to take more than 1,000 mg a day as a supplement because high doses can cause stomach upset and kidney stones.
Vitamin C dose check
Are there vitamins for kidney health?
No vitamin has been shown to protect healthy kidneys on its own. Instead, focus on everyday habits and tick off the ones you already do.
Your kidney habits score
If you already have kidney disease, extra care is needed. Kidney Health Australia advises checking with your doctor before starting any vitamin, herbal or complementary medicine.
What helps keep your bladder healthy?
Small daily habits help keep your bladder healthy. These include:
- Drinking up to 2 litres (6 to 8 glasses) of fluid a day, or the amount your doctor advises
- Cutting back on fizzy drinks, alcohol, tea and coffee if they make your symptoms worse
- Eating plenty of fibre to avoid constipation
- Doing regular pelvic floor exercises, ideally taught by a pelvic health physiotherapist or nurse continence specialist
- Keeping to a healthy weight to take pressure off your pelvic floor muscles
- Going when you feel the urge, without straining or going "just in case"
Today's fluid tracker
Tap a glass for each 250 mL drink you have had today.
To help prevent UTIs, drink plenty of fluids and wipe from front to back after using the toilet.
How do you choose a quality cranberry supplement?
In Australia, look for an AUST L, AUST L(A) or AUST R number on the label. This shows the product is on the Australian Register of Therapeutic Goods.
Which bladder health supplements do we recommend?
We chose these from our kidney and urinary tract supplements range because they fit the evidence in this guide. All three are practitioner products, so a qualified naturopath will check they suit you.
1. Herbs of Gold Cranberry 70000
Herbs of Gold Cranberry 70000 is our top pick for adults who want a vegan, one-a-day cranberry tablet. Each tablet contains 140 mg of cranberry fruit extract, made from 70 g of fresh fruit, plus 100 mg of vitamin C.
Adults and children over 12 take 1 tablet daily with food. A 50-tablet pack was $21.85 on 6 November 2026, which works out at about 44 cents a day.
It is formulated to support urinary tract health, and cranberry contains proanthocyanidins (PACs). The 100 mg of vitamin C sits well under the 1,000 mg daily limit for supplements.
Check with your practitioner first if you take warfarin or tacrolimus, or have had kidney stones. See your doctor if pain or irritation lasts more than 48 hours, and get medical help straight away for blood in your urine.
Key details: 50 tablets | 140 mg cranberry extract (from 70 g fresh fruit) and 100 mg vitamin C per tablet | 1 tablet daily with food | 50-day supply | Vegan and gluten free
Practitioner product: available to Mr Vitamins members and dispensed under the care of a qualified naturopath.
"For healthy bladder"
"Great product"
2. Nutralife Cranberry 50000
Nutralife Cranberry 50000 suits people who want a branded cranberry extract in one daily capsule. Each capsule contains 500 mg of Cran-Max cranberry extract (from 17 g of fresh fruit) and 55 mg of cranberry fruit powder (from 33 g of fresh fruit).
Adults take 1 capsule daily with food. On 6 November 2026 a 100-capsule pack was $38.95, about 39 cents a day, and a 50-capsule pack was $25.95, about 52 cents a day.
It is made to support urinary tract health and provide antioxidant support. The label says not to take it with warfarin without medical advice, and it is not recommended in pregnancy or breastfeeding.
The capsule is made from an animal product, and the product contains sulfites. See your doctor if pain or irritation lasts more than 48 hours, and get medical help straight away for blood in your urine.
Key details: 50 or 100 capsules | 500 mg Cran-Max extract and 55 mg cranberry powder per capsule | 1 capsule daily with food | Contains an animal-derived capsule and sulfites
Practitioner product: available to Mr Vitamins members and dispensed under the care of a qualified naturopath.
"I usually use a 50000 product but, unfortunately can't find locally. Nutralife bottle holds 100, more than other brands. Price was great."
"Excellent"
3. Ethical Nutrients Urinary Tract Support
Ethical Nutrients Urinary Tract Support suits people who prefer a traditional Chinese herbal formula rather than cranberry. Each tablet contains extracts of Rosa laevigata root (93 mg), Smilax china rhizome (75 mg) and Lygodium japonicum (52 mg).
Our product page lists 5 tablets four times a day with food for urinary comfort, or 3 tablets four times a day for maintenance, for 2 to 4 weeks. A 90-tablet pack was $34.95 on 6 November 2026, so it is a short course rather than a daily staple.
It combines herbs used in traditional Chinese medicine to support urinary tract health and comfort. These herbs were not part of the research reviewed in this guide, so its support is based on traditional use.
If you have UTI symptoms, see your GP first. See your doctor if pain or irritation lasts more than 48 hours, and get medical help straight away for blood in your urine.
Key details: 90 or 180 tablets | 3 traditional Chinese herbal extracts per tablet | 12 to 20 tablets a day for 2 to 4 weeks | Vegan
Practitioner product: available to Mr Vitamins members and dispensed under the care of a qualified naturopath.
Our picks compared
| Product | Format | Key ingredients | Daily dose | Approx. cost per day | Customer rating | Best for |
|---|---|---|---|---|---|---|
| Herbs of Gold Cranberry 70000 | Tablet | Cranberry extract 140 mg, vitamin C 100 mg | 1 tablet | About 44 cents | 5.0 (3 reviews) | A vegan one-a-day option |
| Nutralife Cranberry 50000 | Capsule | Cran-Max extract 500 mg, cranberry powder 55 mg | 1 capsule | About 39 cents (100 pack) | 5.0 (2 reviews) | The lowest daily cost |
| Ethical Nutrients Urinary Tract Support | Tablet | Rosa laevigata, Smilax china, Lygodium japonicum | 12 to 20 tablets | About $4.66 to $7.77 (90 pack) | No reviews yet | A short traditional herbal course |
Prices were checked on 6 November 2026 and may change. Ratings include every review on each product page at mrvitamins.com.au on that date, and individual experiences vary.
Practitioner insight from Yurie Sato, Qualified Naturopath
"In store, many people reach for cranberry once a UTI has already started. We explain that cranberry is better suited to daily use for people prone to repeat infections, and that burning, fever or back pain means seeing a GP first." [PRACTITIONER TO CONFIRM]
Is cranberry right for me?
Cranberry is generally considered safe in normal amounts, but very large amounts can cause stomach upset and diarrhoea. Tick anything that applies to you to see what to consider.
Quick safety check
- Tick any boxes above to see personalised points to discuss with your practitioner.
This is general information, not a diagnosis.
Speak to your healthcare professional first if any of these apply to you. Cranberry can interact with some medicines and is not suited to everyone.
- You take warfarin: the evidence on whether cranberry affects warfarin is conflicting, and serious bleeding has been reported in case reports
- You take tacrolimus or other regular medicines: cranberry may change how some medicines are absorbed or broken down
- You have had kidney stones: cranberry contains oxalates, which are found in the most common type of kidney stone
- You have kidney disease: check with your doctor before taking any vitamin, herbal or complementary medicine
- You are pregnant: research has not shown a benefit for preventing UTIs in pregnancy, so talk to your doctor or midwife
When should you see a doctor?
See your GP if you think you have a UTI, as bacterial UTIs are treated with antibiotics. Supplements should never be used in place of medical care.
Get medical help straight away if you have fever, pain in your lower back or side, nausea, vomiting or diarrhoea. These can be signs of a kidney infection, which is serious and needs prompt treatment.
Not sure what is right for you? Our qualified practitioners can talk through your medicines and health history with you, then help you choose safely.
Visit any of our eight Mr Vitamins stores to talk with a practitioner, or browse our range online.
Frequently asked questions
What are the best vitamins for kidney and bladder health?
No single vitamin is proven to protect healthy kidneys, but cranberry has the strongest research support of the common bladder supplements. It may lower the risk of repeat UTIs in women prone to them and in children, while water, a balanced diet, not smoking and regular kidney health checks matter most.
Does cranberry treat a UTI?
No, cranberry is not recommended as a treatment for a UTI that has already started. UTIs caused by bacteria are treated with antibiotics, so see your GP if you have symptoms.
Can men take cranberry for urinary symptoms?
Two trials from the Czech Republic found cranberry powder eased urinary symptoms in men over 45. The evidence is still limited, so men with urinary changes should see their GP first to rule out prostate problems.
Is D-mannose better than cranberry?
Current evidence does not support D-mannose for preventing UTIs. A large 2024 trial of 598 women found daily D-mannose worked no better than a placebo, while cranberry has moderate-certainty evidence for some groups.
Can vitamin C supplements harm your kidneys?
High doses may raise the risk of kidney stones. A Swedish study found men who took vitamin C supplements had about twice the risk of kidney stones, and Australian advice is not to take more than 1,000 mg a day from supplements.
Who should avoid cranberry supplements?
Speak to your doctor first if you take warfarin or tacrolimus, have had kidney stones, have kidney disease or are pregnant. Cranberry contains oxalates, and the evidence on warfarin is mixed.
What are the best vitamins for the liver and kidneys?
This guide covers the kidneys and bladder, not the liver. If you have a kidney or liver condition, check with your doctor before taking any vitamin, herbal or complementary medicine.
References
- Williams G, Stothart CI, Hahn D, Stephens JH, Craig JC, Hodson EM. Cranberries for preventing urinary tract infections. Cochrane Database of Systematic Reviews. 2023;(11):CD001321. https://doi.org/10.1002/14651858.CD001321.pub7
- National Center for Complementary and Integrative Health (NIH). Cranberry. https://www.nccih.nih.gov/health/cranberry
- Howell AB. Bioactive compounds in cranberries and their role in prevention of urinary tract infections. Molecular Nutrition & Food Research. 2007;51(6):732-737. https://pubmed.ncbi.nlm.nih.gov/17487930/
- Vidlar A, Vostalova J, Ulrychova J, et al. The effectiveness of dried cranberries (Vaccinium macrocarpon) in men with lower urinary tract symptoms. British Journal of Nutrition. 2010;104(8):1181-1189. https://doi.org/10.1017/S0007114510002059
- Vidlar A, Student V Jr, Vostalova J, et al. Cranberry fruit powder (Flowens) improves lower urinary tract symptoms in men: a double-blind, randomized, placebo-controlled study. World Journal of Urology. 2016;34(3):419-424. https://doi.org/10.1007/s00345-015-1611-7
- Cooper TE, Teng C, Howell M, Teixeira-Pinto A, Jaure A, Wong G. D-mannose for preventing and treating urinary tract infections. Cochrane Database of Systematic Reviews. 2022;(8):CD013608. https://doi.org/10.1002/14651858.CD013608.pub2
- Hayward G, Mort S, Hay AD, et al. D-mannose for prevention of recurrent urinary tract infection among women: a randomized clinical trial. JAMA Internal Medicine. 2024;184(6):619-628. https://doi.org/10.1001/jamainternmed.2024.0264
- Thomas LD, Elinder CG, Tiselius HG, Wolk A, Akesson A. Ascorbic acid supplements and kidney stone incidence among men: a prospective study. JAMA Internal Medicine. 2013;173(5):386-388. https://doi.org/10.1001/jamainternmed.2013.2296
- healthdirect Australia. Vitamin C and your health. https://www.healthdirect.gov.au/vitamin-c-and-your-health
- healthdirect Australia. Urinary tract infection (UTI). https://www.healthdirect.gov.au/urinary-tract-infection-uti
- Kidney Health Australia. Keeping your kidneys healthy. https://kidney.org.au/your-kidneys/know-your-kidneys/keeping-your-kidneys-healthy/
- Kidney Health Australia. Medicines and kidney disease. https://kidney.org.au/your-kidneys/treatment/medicines-kidney-disease/
- Better Health Channel (Victorian Department of Health). Incontinence prevention tips. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/incontinence-prevention-tips
- Therapeutic Goods Administration. How are vitamins regulated in Australia? https://www.tga.gov.au/news/blog/how-are-vitamins-regulated-australia
- Therapeutic Goods Administration. About assessed listed medicines. https://www.tga.gov.au/products/medicines/non-prescription-medicines/assessed-listed-medicines
- Memorial Sloan Kettering Cancer Center. Cranberry (About Herbs). https://www.mskcc.org/cancer-care/integrative-medicine/herbs/cranberry
- American Phytopathological Society. Cranberries. APSnet Features. https://www.apsnet.org/edcenter/apsnetfeatures/Pages/Cranberries.aspx
Related Articles
Recently Viewed
- ${ variant.price | currencyFromCents } | ${ variant.title } ${ variant.price | currency } | ${ variant.title }
