Testosterone phenylpropionate(Test Phen,TPP) is an oil based injectable solution. It is highly androgenic and anabolic. It is a long lasting ester that acts for a period up to 3 weeks. By its composition, it is similar to Methyltestosterone, but the only difference is that it has less side effects. Clinical studies have demonstrated that it is less toxic to the liver and it produces less aromatization and water retention.