Cranberry Juice Drink
Food · Drink · Food, Typed Supps
The UTI evidence is thinner than the marketing, and this is mostly added sugar anyway.
Stage by stage
- Mostly sugar (The bottle): Nine of the 11.3 g of sugar per 100 g were added, because cranberry alone is barely drinkable.
- Absorption (Gut): Proanthocyanidins are absorbed poorly, which limits how much reaches the urinary tract.
- Excretion (Kidney): Metabolites appear in urine, where the anti-adhesion effect would have to act.
- Warfarin (Liver (CYP2C9)): Documented case reports of raised INR are the basis for the regulatory caution.
What the evidence supports
- Preventing recurrent urinary tract infection — limited evidence. Cochrane finds a small reduction in recurrent symptomatic UTI in women with recurrent infection, with substantial heterogeneity and high dropout.
- Treating an established urinary tract infection — insufficient evidence. No evidence supports acute treatment. The proposed mechanism is anti-adhesion, not antimicrobial, and delaying assessment is how a bladder infection becomes a kidney one.
Timing
There is no acute effect to time. If used, it is a daily prophylactic — and symptoms of an active infection need assessment rather than juice.
Time to effect
- Weeks–months: Any reduction in recurrence, in the trials that found one.
- Never: There is no acute treatment effect on an established infection.
Allergens
None of the fourteen major allergens. May contain: Sulphites. Derived from what this food is, not from a product label.
Eating patterns
Fits: Vegan, Vegetarian, Pescatarian, Halal, Kosher, Gluten-free. Depends on the product: Low-FODMAP.
Environmental footprint
1.5 kg CO2e and 420 litres of freshwater per kg, matched to "Berries & grapes" in Poore & Nemecek (2018), Science 360.
Cost band
Cheap — roughly £2 per kg, as a band midpoint rather than a price.
Key nutrients
Nutrition per 100g
- Calories: 47
- Carbohydrate: 12.2g
- of which sugars: 11.3g
- Fibre: 0.1g
- Sodium: 9mg
Food vs. supplement
This is a rare case where the supplement is the better-designed product. Trials that found an effect used standardised proanthocyanidin doses; juice drink delivers an unmeasured amount of the same compound alongside a large amount of sugar.
Kitchen tip
If you want to try it for prevention, the capsules are the honest version — the studied compound, without nine grams of added sugar per 100 g attached to it.
Common myth
“Cranberry juice clears a UTI.” In reality: It does not, and believing it does is the actual risk — an untreated bladder infection can ascend to the kidneys. The proanthocyanidins stop bacteria sticking to the bladder wall, which is a prevention mechanism, and the trial evidence for even that is modest and inconsistent. If symptoms have started, that is a reason to be assessed, not a reason to open a bottle.
More in Drink
In the glossary
Sources