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The Reality of Weight Loss Supplements: What Science Says in 2026 Weight loss supplements are a multi-billion-dollar industry, promising quick results through pills, powders, and teas that claim to burn fat, suppress appetite, boost metabolism, or block calories. With obesity affecting millions worldwide, it's no surprise that 15% of U.S. adults have tried them. But do they actually work? The short answer from rigorous scientific reviews: most deliver minimal or no meaningful results, and some carry real risks. Sustainable weight loss still comes down to diet, exercise, and lifestyle changes—not a magic capsule.2122b3 How Weight Loss Supplements Claim to Work Manufacturers market these products with mechanisms like: Appetite suppression (e.g., fiber that makes you feel full). Fat blocking or burning (e.g., ingredients that supposedly prevent fat absorption or increase oxidation). Metabolism boosting (e.g., stimulants that raise energy expenditure). Carb or sugar control (e.g., comp...