actually it does reduce bodyfat, and is excellent for pre contest. i recommend it 100mg/ed for the last 4 weeks. dropping it around 5-7 days out.
Masteron is a derivative of DHT (as you can tell from its chemical name: 2a-methyl-dihydro-testosterone propionate), but what they fail to tell you is that DHT and its derivatives are commonly used in treatment of certain forms of breast cancer (see the etymology here: MASTectomy, gynocoMASTia, MASTeron, get it?). Masteron is not clinically used for weight gain (as is common with most steroids), so this makes it a very unique steroid from that perspective. Unfortunately, much of the information on Masteron available in medical journals doesn´t focus on weight or strength gain or even fat loss, for those reasons. Most information on Masteron focuses on it´s use in treating certain forms of breast cancer, and it does this reasonably well.(4)(5) To give you an idea, Masteron + Tamoxifen actually fared better than Chemotherapy for immediate objective responses from patients (8).So? What does this tell us? Well, this makes it a very exciting drug for a lot of reasons. Clearly it won´t aromatize at all nor will it have progesteronic sides, remember, Nolvadex (and most ancillaries) are used to reduce estrogen for breast cancer patients, so a drug used to treat breast cancer obviously wouldn´t convert to estrogen...and in fact Masteron may interact with the aromatase enzymes to inhibit aromatization of other steroids into estrogen, and may additionally interact with estrogen (as a "blocker" of sorts) at the receptor site. (4)(5) This is how it helps to combat breast cancer, obviously, but this could also be part of the reason that Masteron is considered a "cutting" or "Pre-contest" drug. Masteron may actually be very useful for combating estrogenic/progesteronic side effects yes, you read that right, if you include Masteron in your cycle, you may not need other "ancillary" drugs like Arimidex or Letrozole). Hence, much like Proviron, Masteron could be used as an anti-side-effect-drug (remember, most ancillary drugs we use to combat estrogenic sides, like nolvadex, letrozole, and arimidex were originally developed to combat breast cancer...and thats exactly what Masteron was developed and used for). Along a similar line, being a DHT (DiHydroTestosterone) derivative, it´s got a very nice ability to add muscle hardness to an already lean physique, remember, Masteron has a deceivingly low anabolic/androgenic ratio, but since DHT is 5x as androgenic as testosterone and has a 3-4x higher affinity to receptor sites, Masteron provides a lot of "bang for the Buck" when examined on a Mg for Mg basis.
Masteron is a stronger androgen than it appears on paper, and and this could cause increased aggression. As we know, higher androgens also produce that "hard" look prized by competitive BB´ers and as we all know, androgens also promote lypolysis (fat loss). The effects of Masteron, in that way are consistent with the documented effects of (somewhat heavier) androgens to decrease lipoprotein lipase and upregulate -adrenergic receptors on adipocytes, which would inhibit the accumulation of lipid (fat) and enhance the efflux of lipid from these cells in response to catecholamines (1)(2)(3). So, like I said previously, don´t let Masteron´s deceptively low Anabolic:Androgenic ratio fool you, it helps eliminate fat as well (if not better) than much more highly scored androgens, in part due to its being a derivative of DHT. This reduction in fat and rise in aggression (making workouts more effective) could be beneficial for people competing in a sport or who are on a reduced calorie diet. Sounds pretty good, right? Unfortunately, being a DHT derivative means that it can have certain undesirable sides as well (acne, hairloss, prostate enlargement, etc& you may want to consider using Finasteride with this drug). Water retention (and increased danger of high Blood Pressure) with this compound is virtually nil, and liver toxicity is not much of an issue either. Really, you can take heaps of this stuff...the maximum therapeutic dose is pretty high: 167mgs/kg-bdywt/day. So that´s 167mgs per day, every day of the week, for a 220lb person...and that´s not considered excessive by the FDA...who hasn´t been very traditionally liberal on dosing protocols. So clearly, up to that dose is very safe for almost anyone. DHT has a bad reputation for causing prostate hypertrophy, acne, and hairloss& but most people I´ve talked to find that reputation to be mostly undeserved at least in the case of Masteron.