Big and strong is a heavy stack that Provides two great sarms together
7.5mg of rad140  
25mg of S4
Both working on different pathways with a daily dose of 2-4 capsules a day. 
Both compounds together gives you unprecedented power and endurance allowing you to train harder for longer  Melting fat giving you a hard vascular look even if you are consuming fewer calories. Big and strong is a clean compound you wont be having any problems with water retention or bloating