Several drinks can help you have a bowel movement, with prune juice, coffee, and magnesium-based drinks being the most reliable options. Which one works best depends on whether you need gentle, everyday relief or something faster acting.
Prune Juice
Prune juice is one of the most well-established natural laxative drinks. It works because of sorbitol, a sugar alcohol that your body doesn’t fully absorb. Sorbitol pulls water into your colon, softening hard stool and making it easier to pass. Prune juice also contains some fiber, though the juicing process removes a good portion of it. If you want even more sorbitol and fiber, dried prunes deliver more than double the sorbitol of the same serving size of juice.
Most people notice results within a few hours to a day. Start with a small glass (about 4 to 8 ounces) and give it time before drinking more, since too much sorbitol can cause bloating and gas.
Coffee
Coffee stimulates your gut through a hormonal chain reaction. Compounds in coffee trigger the release of gastrin from your stomach lining, which increases motility, the wave-like contractions that push stool through your intestines. This effect is especially strong in the morning, when your body’s natural gastrocolic reflex is already at its peak. That reflex is the reason your digestive tract tends to “wake up” shortly after you eat or drink something.
Both caffeinated and decaf coffee can trigger this response, though caffeinated tends to be stronger. Coffee works fast, often within 20 to 30 minutes. The downside: if you drink coffee regularly, your body may become less responsive to this effect over time.
Pear and Apple Juice
Pear juice and apple juice both contain sorbitol, making them gentle laxative options. Pear juice has more sorbitol than apple juice, so it tends to be slightly more effective. Both are commonly recommended for children with constipation because they’re mild and well tolerated. For adults with occasional sluggishness, a glass of pear juice can provide enough of a nudge without the intensity of stronger options.
Magnesium Citrate Drinks
Magnesium citrate is an osmotic laxative you can buy over the counter in liquid form. Like sorbitol, it works by drawing water into your intestines, but it’s considerably more powerful. Saline-type osmotic laxatives like magnesium citrate can produce results in as little as 30 minutes to six hours, while milder osmotic laxatives take one to three days.
This is not a daily maintenance drink. It’s designed for occasional use when other options haven’t worked. Overuse can cause electrolyte imbalances and dependency, so treat it as a short-term solution rather than a habit.
Kefir and Probiotic Drinks
Kefir, a fermented milk drink rich in probiotics, has shown real promise for constipation. In a pilot study of people with chronic functional constipation, drinking kefir daily for four weeks increased stool frequency, improved stool consistency, and reduced laxative use. People with slow-moving colons saw an actual acceleration of their colonic transit time. Participants also reported higher satisfaction with their bowel habits overall.
The catch is that kefir takes time. You won’t get same-day relief the way you might with coffee or magnesium. It works by gradually shifting the bacterial balance in your gut, so think of it as a longer-term strategy you layer alongside quicker options.
Warm Water and Other Warm Liquids
You’ll see warm water recommended frequently for constipation, but the evidence is thin. Some small studies suggest warm liquids may speed up how quickly food moves through your digestive tract, and many people find warm drinks relaxing for their gut. However, by the time any liquid reaches your intestines, it has already cooled to body temperature. There’s no conclusive evidence that hot water relieves constipation better than cold water.
That said, drinking enough fluid in general does matter. Bowel movement frequency drops noticeably at very low fluid intakes (around two cups a day compared to ten). One study found that people eating adequate fiber who drank about two liters of fluid daily had more frequent bowel movements and used fewer laxatives than those drinking only one liter. The key detail: increasing fluid alone, without adequate fiber, hasn’t been shown to fix constipation. Water works best as a partner to fiber, not a solo fix.
Flaxseed Drinks
Stirring ground flaxseed into water creates a simple high-fiber drink. One to four tablespoons of ground flaxseed per day is the range typically used for constipation relief. You can mix a tablespoon into a glass of water and drink it once or twice daily, or blend it into a smoothie. Whole flaxseeds and flaxseed oil are less effective because your body can’t break down the whole seed’s outer shell as easily, meaning you miss out on most of the fiber.
What to Avoid: Aloe Vera Juice
Aloe vera juice is sometimes marketed as a natural laxative, but it carries real risks. Unpurified aloe vera contains compounds called anthraquinones, which act as harsh stimulant laxatives. The FDA has banned anthraquinone-containing ingredients from over-the-counter laxative drugs. Animal studies have linked non-purified aloe vera extracts to increased rates of colon tumors and intestinal cell changes. Purified, decolorized versions with low anthraquinone levels appear safer, but the labeling on consumer products isn’t always clear about which type you’re getting. Safer options exist.
Putting It Together
If you need relief today, coffee in the morning or a glass of prune juice are your best starting points. For something stronger, magnesium citrate liquid works within hours but should stay occasional. For ongoing issues, daily kefir, adequate water intake paired with fiber, or a ground flaxseed drink can help keep things moving over weeks. The single most effective combination is sufficient fluid plus sufficient fiber, around 25 grams of fiber and roughly two liters of fluid per day. No single drink is a magic fix, but layering these options gives you reliable tools for both quick relief and long-term regularity.