You're already taking enough. You're just gonna waste more money going with another stack. Stick with something basic like fast twitch, by cytosport, the same co. that makes musclemilk. It has everything u need in it. and it works out to be cheaper than other stacks. It's a powder, it takes great, and u don't have to mix it with alot of water. It works for me, and others have raved about it. check it out at bulknutrition.com. Cytosport is now my supp company of choice, and trust me, i've tried close to 93% of products out there over the past 3 years. There's a reason i choose cytosport. It works.