At a glance
Prune juice is one of the oldest and most commonly recommended natural remedies for constipation. It works — and there is genuine evidence to support this, not just folk wisdom. For people managing colorectal conditions where soft, regular stools are essential, prune juice can be a practical addition to the daily routine.
Why it works
Prunes (dried plums) and prune juice contain several components that contribute to their laxative effect:
- Sorbitol — a naturally occurring sugar alcohol that draws water into the bowel, softening stools. Prunes contain significantly more sorbitol than most other fruits.
- Fibre — whole prunes contain both soluble and insoluble fibre. Prune juice has less fibre but retains the sorbitol.
- Phenolic compounds — these naturally occurring chemicals stimulate bowel muscle contractions, helping move things along.
- Potassium — supports fluid balance and bowel function.
The combination of these components makes prunes more effective than fibre alone for many people.
How to use it
Starting out
- Start small — a small glass (120 to 180ml) of prune juice or four to five whole prunes per day
- Timing — most people describe drinking prune juice in the morning, either first thing or with breakfast. Effects typically occur within a few hours.
- Warm or room temperature — some people find warm prune juice more effective than cold, though both work
Adjusting
- If the initial amount is not enough, increase gradually
- If it causes cramping or loose stools, reduce the amount
- Consistency matters — daily use is more effective than occasional use
- Combine with adequate water intake — the sorbitol works by drawing water into the bowel
Practical tips
- Buy pure prune juice without added sugar
- Whole prunes can be eaten as a snack or added to porridge, yoghurt, or baking
- Stewed prunes (cooked gently in water) are another popular option
- Some people find mixing prune juice with water makes it more palatable
Prune juice versus other options
| Option | Mechanism | Speed | Palatability |
|---|---|---|---|
| Prune juice | Sorbitol + phenolics | Hours | Moderate |
| Whole prunes | Sorbitol + fibre + phenolics | Hours to next day | Good |
| Psyllium husk | Bulk-forming fibre | 1-3 days | Neutral |
| Stool softeners | Draws water into stool | 1-2 days | N/A (tablet) |
| Osmotic laxative | Draws water into bowel | 1-3 days | Variable |
Prune juice is not a replacement for other stool management approaches — it works best as part of a broader strategy that includes fibre, hydration, and sometimes medication.
When prune juice is not enough
If prune juice and dietary changes are not producing soft, regular stools, consider:
- Adding a fibre supplement (psyllium husk)
- Using a stool softener (docusate)
- An osmotic laxative (macrogol/Movicol) for persistent constipation
- Discussing the constipation with your GP — there may be an underlying cause or a medication contributing to the problem