Thermogenics, or fat-burning supplements, are the original weight-loss products. These ingredients promise to burn fat by increasing one’s resting metabolic rate. While they may seem old-school, Market Research Future found in October 2025 that these supplements are the fastest-growing segment of the weight loss market. There’s also evidence that they actually work, which is important for a weight loss supplement. One 2025 randomized clinical trial found that thermogenic supplementation resulted in greater fat loss and body fat reduction than placebo. Thermogenic supplements can include ingredients like caffeine, green tea extract, capsaicin, and bitter orange.
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