I make this one for the taste first and the health story second, which is the right way round. Fresh cranberries are brutally sharp, so sharp that the cartons in the supermarket are mostly water and sugar with a splash of actual juice, and once you have juiced a bag of them you can see exactly why. Two ripe pears sort that out without a spoonful of anything going in, and a thumb of ginger gives it a clean heat at the back of the throat. It comes out a deep ruby red and it drinks like something fresh rather than something sweet.
Why these ingredients work
Cranberries earn their reputation honestly, and for once the research is decent. They contain proanthocyanidins, tannin-like compounds that stop some strains of E. coli from gripping the cells lining the bladder, which is the mechanism behind the old folk remedy. The Cochrane review updated in 2023 pooled 50 trials and around 8,900 people and found cranberry products cut symptomatic, laboratory-confirmed urinary tract infections overall, with a relative risk of 0.70. In women with recurrent infections the figure was 0.74, so roughly a quarter fewer. The same review found no benefit at all in older people living in care homes, in pregnancy, or in people whose bladders do not empty properly, and it could not establish which dose of those compounds actually matters.
Now the caveat, and it is the one the supplement shelves never mention. This is prevention, not treatment. If you have burning when you pee, are needing to go constantly, or there is blood in your urine, you need a GP and probably antibiotics, and no amount of juice will shift an infection that has already taken hold. And one more, which matters more than any of it: the NHS advises against cranberry juice and cranberry products entirely if you take warfarin, because it can affect your INR. If you are on an anticoagulant, leave this recipe alone and have a word with your clinic.
The pear is doing real work rather than decorating the glass. A cranberry sits at about pH 2.4, somewhere between lemon juice and vinegar, and it carries tannin that leaves your mouth dry afterwards. A ripe pear brings roughly 10 g of sugar per 100 g, plenty of water and a soft grain that rounds the sharpness off without turning the drink syrupy. Ginger is the natural partner: gingerol gives it that warm bite, and ginger is one of the few things that turns up in a juice glass with proper trial evidence behind it, for nausea rather than anything more glamorous (Viljoen and colleagues, Nutrition Reviews, 2014).
Two honest notes on the numbers. Cranberry is unusually low in sugar for a fruit at about 4 g per 100 g, so nearly all of the 20 g or so in a glass comes from the pears. And straining leaves most of the fibre in the pulp, so this is a drink, not a substitute for eating the fruit. At around 24 mg of vitamin C a glass it is not a vitamin C top-up either, whatever the carton in the shop implies.
FAQ
Does cranberry juice cure a UTI?
No, and it is worth being blunt about that. The trials are about preventing repeat infections in people who are prone to them, not clearing one that is already there. If you have symptoms now, see a GP. Cranberry is not a substitute for antibiotics, and putting off treatment is how a straightforward bladder infection becomes a kidney infection.
How much cranberry juice do you need for it to help?
Nobody can give you an honest figure. The Cochrane review found the trials used juice, tablets and capsules at wildly different strengths, and it could not establish which dose of proanthocyanidins matters, or that one form beats another. Most products do not even state the content on the pack. So I would not pretend a set number of glasses is a dose. If you keep getting infections, tell your GP or practice nurse what you are drinking rather than quietly self-treating.
Why is fresh cranberry juice so sharp, and can I sweeten it?
Because cranberries really are that sour, and they are full of tannin as well, which is the drying feeling you get afterwards. The shop versions fix that with sugar or grape juice. Here the pear does it, and the fix for a glass that is too sharp is a riper pear rather than a spoon of sugar. If you use the blender, strain it fairly promptly, because the longer the skins sit in the liquid the more astringent it turns.
More immunity recipes: see the full Immunity collection.
Cranberry, Pear and Ginger Juice
Equipment
- 1 Juicer
- 1 Nut milk bag
Ingredients
For the juice
- 250 g fresh cranberries rinsed, any soft or shrivelled ones picked out
- 2 ripe pears about 320 g, cores cut out, skin left on
- 20 g fresh root ginger a thumb-sized piece, peeled
For the blender method
- 100 ml cold water
Instructions
Juicer method
- Rinse the cranberries in a colander and pick out any soft or shrivelled ones. There is no need to top and tail them.
- Cut the pears into quarters and slice the core out of each one. Leave the skin on, that is where a lot of the colour and flavour sits.
- Juice the pear first. A cranberry is small and firm and will bounce around a dry basket, so getting some pear juice in there first gives it something to land in.
- Add the ginger, then feed the cranberries through a handful at a time, alternating with the last of the pear.
- Stir the jug once and pour it straight into a glass. It keeps in a sealed bottle in the fridge for up to three days, and it will settle a little as it stands, so give the bottle a shake before you pour.
Blender method
- Tip the cranberries into the blender with the 100 ml of cold water and blitz for about 30 seconds, until they have broken down into a rough red slush.
- Add the pear, cut into rough 2 cm chunks, and the peeled ginger, then blend for another 45 seconds until everything is smooth and loose.
- Pour it through a nut milk bag or a fine sieve set over a jug and press it through with the back of a spoon. Cranberry pulp is thick, so work in two batches rather than one big one, otherwise it just sits there.
- Strain it reasonably quickly rather than leaving it to stand. The skins carry tannin, and the longer the pulp sits in the juice the more drying and astringent the glass gets.