Boldenone undecylenate is a long-acting anabolic-androgenic steroid ester derived from boldenone. It has historically been associated primarily with veterinary use.

The supplied product specifies 500mg. The undecylenate ester produces prolonged release of boldenone following administration, while the parent compound interacts with androgen receptors.

Potential effects in humans include suppression of endogenous hormone production, changes in hematocrit and blood viscosity, altered lipid profiles, cardiovascular effects, and impaired fertility.