Making prune juice at home takes about 20 minutes and requires only dried prunes and water. The process is simple: simmer pitted prunes in water, blend the mixture, and strain it. Homemade prune juice gives you control over the concentration and lets you avoid the added sugars found in some store-bought versions.
Basic Homemade Prune Juice Recipe
Start with about 1 cup (roughly 10 to 12) of pitted dried prunes and 4 to 5 cups of water. Place both in a saucepan, bring to a boil, then reduce the heat and let the mixture simmer for 15 to 20 minutes. The prunes will soften and the water will darken as the natural sugars and compounds release into the liquid.
Once cooled slightly, pour everything into a blender and pulse until smooth. Then strain the mixture through a fine mesh sieve or cheesecloth into a jar, pressing down on the pulp to extract as much liquid as possible. What you’re left with is a thick, dark juice ready to drink. If the consistency is too thick, add more water until it reaches your preference.
For a no-cook version, soak pitted prunes in hot water overnight. By morning the prunes will have released much of their sorbitol and natural sugars into the water. Blend and strain using the same method. This approach produces a milder juice but still works for constipation relief.
Why Prune Juice Works
The laxative effect comes primarily from sorbitol, a naturally occurring sugar alcohol that draws water into the intestines and softens stool. Whole prunes contain about 14.7 grams of sorbitol per 100 grams, while prune juice contains roughly 6.1 grams per 100 grams. That concentration is high enough to act as a natural osmotic laxative, meaning it pulls fluid into the colon to get things moving.
Prunes also contain significant amounts of phenolic compounds, particularly chlorogenic acids, which may further support the laxative effect and slow glucose absorption. So the benefit isn’t just one ingredient. It’s the combination of sorbitol, fiber remnants, and plant compounds working together. A randomized controlled trial published in The American Journal of Gastroenterology found that participants drinking prune juice daily had significantly fewer hard stools after three weeks compared to a placebo group, with stool consistency continuing to improve through seven weeks.
How Much to Drink
For adults, start with a half-cup (4-ounce) serving in the morning. Research shows that as little as 2 ounces per day can increase bowel movements. If your body responds well and you want more effect, add a second 4-ounce serving before bed. A Harvard-referenced trial used about 1 cup daily (roughly 200 grams) for chronic constipation with positive results over eight weeks.
Starting small matters because prune juice is calorie-dense. One cup of prune juice contains about 182 calories and 42 grams of natural sugar. Jumping straight to large quantities can cause gas, bloating, or cramping, especially if your gut isn’t used to sorbitol. Give your system a few days to adjust before increasing your intake.
How Quickly It Works
There’s no universal timeline. Some people notice results within a few hours of their first glass, while others need several days of consistent intake. The speed depends on the severity of your constipation, your hydration levels, and your individual gut sensitivity to sorbitol. For chronic constipation lasting weeks or months, expect to drink prune juice daily for at least two to three weeks before seeing a consistent shift in stool quality.
Tips to Improve Effectiveness
Drinking prune juice warm can help. Warm liquids stimulate the gastrocolic reflex, which is the natural wave of muscle contractions in your colon triggered when your stomach stretches. This reflex is strongest in the morning, so a warm glass of prune juice first thing pairs two natural triggers for a bowel movement.
Keep the pulp if you want a stronger effect. Straining removes most of the fiber, and while the sorbitol in the liquid does the heavy lifting, the fiber in whole prunes adds bulk to stool. If you can tolerate the thicker texture, blend the prunes into a smoothie with water instead of straining. You can also stir leftover pulp into oatmeal or yogurt.
Stay hydrated throughout the day. Sorbitol works by drawing water into your intestines, so it needs available fluid to do its job. Drinking prune juice while otherwise dehydrated can reduce its effectiveness and increase cramping.
Using Prune Juice for Infants and Children
For babies younger than 4 months, Children’s Hospital of Philadelphia recommends mixing 1 ounce of prune juice with 1 ounce of water, given once or twice a day. For babies between 4 months and 1 year, prune juice can be offered alongside high-fiber baby foods like oatmeal, peas, and pureed pears. Always dilute the juice for infants, as the full-strength version is too concentrated for a developing digestive system.
Storage and Shelf Life
Homemade prune juice keeps in the refrigerator for 7 to 10 days when stored in a sealed glass jar or airtight container. Because there are no preservatives, the juice will start to ferment after that window. You’ll notice a slightly fizzy or sour taste when it’s past its prime. If you make a large batch, consider freezing portions in ice cube trays or small containers. Frozen prune juice keeps for two to three months and thaws quickly at room temperature or in warm water.