Primex M100 10ml vial, 100mg/ml (Swiss Pharm). Primex M100 is the only steroid that works well on a low calorie diet. Effective for bulking, but tends to harden and add muscle tone more that build big muscles. Primex M100 works great when added to a cycle (stacked) with other steroids, it tends to lessen water retention and harshness when stacked with more heavy duty testosterone injectables, like Omnadren / Sustanon, Cypoinate / Propionate, ect. It is an analog immune-stimulating steroid used by people with Aids and others with depressed immune systems to build up the immune system and add lean muscle mass. Primex M100 is one of the finest steroids in the world today.