MyoCrin is associated with mibolerone, a potent synthetic anabolic-androgenic steroid historically known by the name Cheque Drops. Mibolerone has strong androgenic and anabolic activity and is structurally related to other 19-nor steroids.

The product name identifies the formulation as an injection. Mibolerone is not a conventional approved human therapeutic medicine, and its pharmacological potency makes careful consideration of potential adverse effects especially important.