Boldenone undecylenate is an esterified anabolic-androgenic steroid that releases boldenone gradually after administration. It is best known historically in veterinary medicine, where long-acting formulations have been used in specific animal-health settings.

The stated product strength is 250. Boldenone has androgenic and anabolic activity and can influence erythropoiesis and other androgen-responsive processes.

In humans, non-medical exposure may result in suppression of endogenous testosterone and sperm production, changes in blood lipids and hematocrit, and cardiovascular or reproductive effects.