Celery seed is one of the lesser-known herbs in Western herbal medicine. However, it has been used for thousands of years in other parts of the world for a variety of reasons. Celery Seed Extract is a natural dietary supplement that supports the circulatory system. It has been known to help lower blood pressure and improve circulation in people who are suffering from Hypertension. It may also help prevent male impotence if applied to the skin. Celery is used in weight-loss diets, where it provides low-calorie dietary fibre bulk. Celery is often incorrectly purported to be a "negative calorie food" based on the idea that the body will burn more calories during the digestion of the food than the body can extract from the food itself. However, the fact that the body uses very small amounts of energy in digestion compared to what can be extracted even from a low-calorie food like celery disproves this hypothesis.