Ecdysterone is an extract from the herb Leuzea, which contains up to 90% of the active ingredient ecdysterone, which is an ecdysteroid.

Ecdysteroids have a structure similar to androgens and are popular among athletes as steroid substitutes, as well as supplements for improving athletic performance and muscle growth.

The potential effects of ecdysterone on health and fitness have been the subject of much research.