Primobolan

Quick info about Primobolan

I happen to be one of the few people who have used drostanolone enanthate (Masteron with the enanthate ester attached) as well as methenolone enanthate (injectable Primobolan). The results from these two compounds, when ester and mg potency are the same, are in fact very similar. It also has a relatively high affinity for binding to the AR, actually binding better than testosterone. This ability to strongly bind to the AR may be why Primobolan is such a good "fat burner." 

Primobolan is primarily for use in gaining and maintaining lean tissue. It's a great choice for this purpose, and many competitors have used it very successfully to retain muscle while on a reduced-calorie diet. The reason Primo is so useful for this purpose is that one of it's primary functions is to help your body retain nitrogen at a greatly enhanced rate. The greater your nitrogen retention, the more muscle you will build. In the case of using primo as a pre-contest drug, this nitrogen retention will help you retain muscle and ensure that your dieting preferentially favors fat loss over muscle loss.

When men were given a 30-45mg dose of the oral version of Primo, they experienced a 15-65% decrease in gonadotropin levels (9). 100mgs is a good dose for gains—well, you'll also reduce your gonadotropin levels considerably. It is hard to understand why people recommend either oral or injectable Primobolan as a possible bridging compound for this reason. Maybe at a too-low-to-do-anything dose of 10mgs it could be used as a bridge. And forget about using injectable Primo to bridge. Generally, injectable primo needs to be used at a dose of at least 350mgs/week (100mgs/ every other day), and preferably at a dose of 400-600mgs/week.