Bitter orange is a small citrus fruit. It is known for its extremely bitter and sour taste. In some parts of the world, bitter orange is consumed as a food, although it is usually too bitter for most people to be edible. It is gaining popularity as a supplement, supposedly for a variety of different uses, such as:
- To stimulate the appetite
- To help with weight loss
- To relieve heartburn and indigestion
- To relieve nasal congestion
- To help with chronic fatigue
- To lower blood sugar and cholesterol.
People also apply it to the skin for a variety of conditions, such as for
cold sores or fungal infections (such as athlete's foot).
Bitter orange contains several different active components.
One of these components is synephrine, a stimulant compound similar to
ephedra. While synephrine may theoretically suppress the appetite or increase metabolism, it is also responsible for many of the side effects of the supplement. Bitter orange also contains flavenoids, plant compounds that may possess antioxidant activity. The supplement also appears to have some activity as an antibiotic or antiviral.