The blood volumization is unmatched, and nearly instant after dosing. As far as tangible gains in muscle, I have only been on it for two weeks, but I would theorize that any anabolism would be hard pressed to occur, as this is the final of the three-phase steps before cycling again. If you were to use Bridge as a standalone supplement disregarding the label directions and specific intent of the product, I can see some truly significant long terms gains being made, but this is meant to serve as more of a 'pause' button on your physique so that as AAS are removed, and PCT is completed it works in harmony with your endogenous hormones and nitrogen retention to continue that feeling of AAS induced gratification and maintenance of lean muscle mass.