Bitter orange (Citrus aurantium) extract supplies synephrine, a mild stimulant. People reach for it to raise energy, support metabolism, and curb appetite during a fat loss phase. Capsules, extracts, and powders are the usual forms.
Many take bitter orange in the morning or before a workout. Some products stack it with caffeine or other stimulants. That combination sharpens the lift but also increases the chance of side effects.
Bitter orange can drive up heart rate and blood pressure. Skip it if you have a heart condition or anxiety disorder. It may clash with blood pressure drugs, MAOIs, and other stimulants.