Masteron is an injectable anabolic steroid that is a DHT (dihydrotestosterone) derivative. Often slanged as Mastabol, Mast, or Masto, Masteron is generally available as – Drostanolone Propionate and Drostanolone Enanthate. Masteron is chemically structured as 2a-methyl-androstan-3-one-17b-ol. The drug is a product of Sarva Syntex Co. Belgium.
Masteron Propionate is the Propionate version of Masteron. It is an injectable intramuscular drug with a chemical formula of C22H36O3. Masteron Propionate (Drostanolone Propionate) was originally produced as an anti-estrogen to treat breast cancer. It is medically used with the SERM (Selective Estrogen Receptor Modulator) Tamoxifen (Nolvadex) for treating breast cancer.
Masteron Propionate is usually dosed at 50-150mg/ml. It is very popular and favorite amongst the bodybuilders due to its extraordinary characteristics. It has ability to improve the muscle hardness and density due to the androgenic properties. Bodybuilders go for this drug because this is beneficial for them as it doesn’t convert itself into estrogen which causes water retention; this gives the muscles a smooth appearance. The androgenic properties of Masteron propionate also help to boost the energy levels for intense training in athletes.
Masteron Propionate is fast acting anabolic steroids, and thus it is often required to be injected every other day. It acts very fast and breaks down very quickly, so the athlete can have the benefit of Masteron Propionate, using it ten days before the drug test. Masteron Propionate is good for the athletes who want to avoid water retention and who have a problem with an elevated estrogen level.
The minimum dose with Masteron Propionate is set at 100mgs/day. It is advised that users should use only an amount of 600mgs per week. As Masteron propionate has a short duration of effect, it is often required to be injected every 2-3 days. Though Masteron Propionate is not recommended for women, yet many female athletes take it before championships. The recommended dosage for women is 100mg every 4-5 days.
Masteron Propionate has not many side effects, but it may cause some, such as hair loss, acne, and increased aggression. This drug is illegal in the United States; It is Schedule III drug in .
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Like other AAS, drostanolone is an agonist of the androgen receptor (AR).  It is not a substrate for 5α-reductase and is a poor substrate for 3α-hydroxysteroid dehydrogenase (3α-HSD), and therefore shows a high ratio of anabolic to androgenic activity.  As a DHT derivative, drostanolone is not a substrate for aromatase and hence cannot be aromatized into estrogenic metabolites .  While no data are available on the progestogenic activity of drostanolone, it is thought to have low or no such activity similarly to other DHT derivatives.  Since the drug is not 17α-alkylated , it is not known to cause hepatotoxicity . 
The side effects of Nebido can include those of an androgenic nature. The androgenic side effects of Nebido are, however, highly dependent on genetic predispositions and will not affect all men. The possible androgenic side effects of Nebido include accelerated hair loss in those predisposed to male pattern baldness, acne in sensitive individuals and body hair growth.
While by no means always necessary, some men may find the use of a 5-alpha reductase inhibitor to be useful. The testosterone hormone is metabolized by the 5-alpha reductase enzyme, which reduces the testosterone hormone to dihydrotestosterone (DHT). The DHT is what leads to the androgenic related effects. By incorporating a 5-alpha reductase inhibitor, you will reduce the hormones androgenicity. It will not be a complete reduction, but it will be significant. However, such inhibitors are not always recommended and should only be used as needed as they can hinder the potency of the testosterone hormone.