EST Drive will work well for those looking to gain lean muscle mass. It also is a great choice for post cycle therapy. Test Drive is enhanced with Zinc (as aspartate), Magnesium, and Vitamin B6 in the precise ratio to increase testosterone in the body. It's also enhanced with Tribulus Terrestris, which increases natural testosterone in the body. Utilizing Protodioscin & Saponins in the correct ratios. And it contains a Nitric Oxide complex (Nitric DriveTM), which increases nitric oxide in the body by utilizing L-Arginine HCL and AAKG.