Anavar vs Winstrol. Oxandrolone a unique oral anabolic steroid hormone that is also known as Anavar. Anavar was first synthesized in 1962 and has been used in the medical treatment of catabolic disorders for over 30 years. Anavar is unique because it has great oral bioavailability (can be taken my mouth) and is resistant to liver metabolism. Anavar also does not get aromatized into estrogen compared to testosterone.