Typically, enzymes in your intestines break down fat from food so your body can absorb the fat. But the active ingredient in alli attaches to some of these enzymes and prevents them from digesting about a quarter of the fat you eat. Because undigested fat can’t be absorbed, it passes out of your body instead of turning into calories. The main side effect occurs when you eat a meal with too much fat while taking alli. If so much fat is blocked that your stool can’t absorb it, you might have side effects. Because they are not harmful, we call them “treatment effects.” These include loose or more frequent stools, an urgent need to go to the bathroom, or gas with an oily discharge. The excess fat that passes out of your body is in no way harmful. In fact, you may recognize it as something that looks like the oil on top of a pizza. Treatment effects can be lessened if you stick to reduced-calorie, low-fat meals that average 15 grams of fat per meal. 90 Day Money Back Guarantee Return Policy. We take great pride in the superior quality of our products and want you to be pleased with your purchase. We believe in offering the very best value, quality and selection to our customers. You may return any unused and unopened item purchased from us for any reason within Ninety (90) days of your purchase. Auto-ship sales are final. Customer Care






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