Bitter Orange Extract Plus Caffeine Boosts Energy Expenditure

Bitter orange (Citrus aurantium) is a nervous system stimulator included in many weight-loss and energy-boosting supplements. A chemical called p-Synephrine is responsible for its effects. Subjects performed squats for six sets of 10 repetitions at 80 percent of maximum capacity. Adding caffeine to p-Synephrine had a small effect on endurance during the later sets. The energy-boosting effects of these supplements might promote fat loss, reduce the perception of fatigue during exercise and make workouts seem easier. They might improve performance by increasing training adherence (i.e., showing up at the gym). Other studies have concluded that bitter orange extract is safe when taken as directed. (Journal American College of Nutrition, 2: 1-13, 2016)

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