Since primobolan increases nitrogen retention, it’s been touted as anti-catabolic, and somewhat anabolic (which can be disputed). In simple terms, it helps you keep your muscle mass while you’re dieting. That’s one of the biggest reasons it’s used on cutting cycles. Anecdotally, evidence shows that by using primobolan during low-calorie diets (even 20-30% below your BMR), you can keep your current lean muscle while gaining new muscle tissue. While this seems to be against basic understanding of nutrition, we’ll chuck this one to the magic of steroids. I can safely say, multiple clients of mine have used primobolan for pre-contest or pre-modeling cycles and have literally gained lean mass while losing bodyfat. I’m not saying they became mass monsters, but an average 1 pound of muscle mass per week while dropping bodyfat isn’t too bad.