Testonon 350 (Multi Blend Testosterone) ISIS Pharma is a multi-ester Testosterone blend injectable steroid with slightly quicker and slower esters which broadens the absorption rate. Each 1ml of Testonon 350 contains: 20mg Test Ace 25mg Test Prop 35mg Phenyl Prop 135mg Test Decanoate 135mg Test Cypionate Testonon injection (Multi-ester Testosterone mix) is for intramuscular use only, be given deep in the gluteal muscle. It is a blend of anabolic steroids mixed that will help to gain the strength and power in workouts. Testonon 350 (Steroid Cycles) is a substitute of Sustanon.