Smooth Move tea works by delivering senna, a plant-based stimulant laxative, to your large intestine, where gut bacteria convert it into an active compound that triggers your colon to push waste through faster while pulling extra water into the stool. Most people experience a bowel movement within 6 to 12 hours of drinking a cup, which is why the tea is commonly taken before bed for relief the next morning.
What Happens Inside Your Body
The key active compounds in Smooth Move tea are called sennosides, which come from senna leaf. What makes them interesting is that they’re essentially inactive when you first swallow them. Stomach acid can’t break them down, and the enzymes in your small intestine can’t touch them either. Sennosides pass through the upper digestive tract completely intact, which means they don’t get absorbed into your bloodstream.
The real action starts in your large intestine. There, specific bacteria (including a species called Peptostreptococcus intermedius) produce enzymes that strip the sennosides down into their active form: a compound called rhein anthrone. This is why the tea takes hours to work rather than minutes. Your gut bacteria need time to do the converting.
Once rhein anthrone is released, it does two things simultaneously. First, it activates immune cells in the colon wall, which release a signaling molecule that reduces how much water your colon absorbs from waste. Normally, your colon’s job is to pull water out of stool as it passes through, which is what makes stool firm. Rhein anthrone essentially turns down that water-absorbing function, keeping the stool softer and bulkier.
Second, rhein anthrone slows down contractions in the upper part of the colon. That might sound counterintuitive, but the effect is that waste spends less time sitting in the early sections where water would normally be extracted. The result is faster transit through the entire colon, with softer stool arriving at the rectum sooner than it otherwise would. The combination of more water in the stool and faster movement is what produces a bowel movement.
The Supporting Ingredients
Senna does the heavy lifting, but Smooth Move tea also contains licorice, bitter fennel, cinnamon, ginger, coriander, and sweet orange. These herbs serve a practical purpose: they help soothe the bowels and reduce cramping, which is one of the most common complaints with stimulant laxatives. Fennel and ginger, in particular, have long histories of use for gas and digestive discomfort. They won’t produce a bowel movement on their own, but they can make the experience of senna gentler on your stomach.
How to Use It Effectively
Steeping time matters with Smooth Move tea. A longer steep pulls more sennosides out of the tea bag, producing a stronger laxative effect. If you’re trying it for the first time, a shorter steep (around 10 to 15 minutes) lets you gauge your sensitivity before going stronger. Most people drink one cup before bedtime, since the 6-to-12-hour onset lines up with a morning bowel movement.
One cup per day is the general recommendation, and the tea is designed for occasional constipation rather than daily, indefinite use. If you find yourself reaching for it every day for weeks, that’s a sign worth paying attention to, not because of proven damage to the colon, but because regular constipation that requires ongoing laxative use usually points to something worth investigating, whether that’s diet, hydration, medications, or an underlying condition.
Side Effects and What to Expect
Stomach cramps and diarrhea are the most common side effects, occurring in more than 1 in 100 people who use senna. If you have constipation related to irritable bowel syndrome, you’re particularly likely to experience cramping. This happens because the same mechanism that speeds up transit also triggers stronger-than-usual contractions in the colon wall.
You might also notice your urine turning a red-brown color. This is harmless and goes back to normal once you stop drinking the tea. It’s caused by senna compounds being filtered through the kidneys, not by blood, so there’s no reason to worry about it.
Is Long-Term Use Harmful?
There’s a persistent belief that stimulant laxatives like senna damage your colon or cause “lazy bowel,” where your intestines lose the ability to function on their own. A comprehensive 2023 review of the research found surprisingly little evidence for this. While very high doses have been shown to cause temporary changes to the cells lining the colon in both animal and human studies, those changes reversed once the laxative was stopped and aren’t considered clinically significant.
No formal long-term studies have demonstrated lasting changes to the nerves or muscles of the intestine from senna use in humans. Many older studies that suggested harm failed to account for confounding factors like neurological disease, metabolic disorders, and aging, all of which independently affect bowel function. The review’s authors concluded that the benefits of stimulant laxatives, even over the long term, deserve reconsideration for people managing chronic constipation. That said, the tea is marketed for occasional use, and most people treat it that way.