Masteron, or drostanolone propionate, is a popular steroid among competitive bodybuilders. It is commonly used in contest preparation for many reasons. To begin with, drostanolone propionate is a derivative of DHT (dihydrotestosterone), and therefore, it will not aromatize into estrogen. Competing bodybuilders find this extremely beneficial because aromatization typically causes excess water retention which may give the muscles a smooth appearance. Another advantage of Masteron is its strong androgenic component. The androgenic effect of this steroid can cause a noticeable improvement in muscle density and hardness which can help the bodybuilder obtain the "ripped" look if his bodyfat percentage is low enough. The androgenic effect is also crucial because it helps to provide sufficent "kick" or "drive" for intense training when an athlete has lowered his caloric intake for contest preparation. Masteron can also be used successfully by bodybuilders preparing for a drug-tested show. The substance drostanolone propionate is fast acting and quickly broken down. The athlete can therefore use Masteron up to about ten days before a drug test. The average dosage of Masteron is 100 mg injected every other day. It is best to inject Masteron every 2-3 days because it has a short duration of effect. Popular steroids stacked with Masteron include Parabolan (trenbolone hexahydrobencylcarbonate), Winstrol (stanozolol), and oxandrolone. Athletes rarely experience any side effects with this steroid. Masteron is not hepatoxic, and gynecomastia should not be a concern since it does not convert into estrogen. Some possible side effects include acne, accelerated hair loss, and increased aggression. The main disadvantage of Masteron is its very poor availability on the black market and its high price. Masteron from Belgium comes in a box of two ampoules. Each 2 ml amp will contain 100 mg of drostanolone propionate. One of these boxes containing two amps can cost well over $50 on the black market.