Supplements for Weight Loss
The bitter orange tree is native to Africa and tropical Asia. It's also grown in the Mediterranean, California, and Florida.
Bitter orange fruit rind contains synephrine, a stimulant related to ephedrine. It supposedly works by raising the number of calories burned.
After the FDA banned weight loss products containing ephedra, many makers switched to bitter orange, but it's not clear if it's safer.
Natural Medicines says that bitter orange is "possibly unsafe" and there's not enough evidence to know if it works for weight loss.
Some studies show bitter orange supplements can raise your blood pressure and heart rate. There have been reports that they may have had dangerous side effects in people who took bitter orange alone or combined with other stimulants such as caffeine. The risks include:
The FDA says bitter orange may not be safe to use as a dietary supplement. You should especially avoid it if you have a heart condition, high blood pressure, or other medical problem.
You should also avoid bitter orange supplements if you take caffeine, certain medications (such as MAO inhibitors), or herbs or other supplements that speed up the heart rate.