I used the sdi labs winni-v, it's only good for fat loss. Don't think it can help you build. I couldn't consume enough calories because of the eca stack's appetite suppression. I used it for two weeks to see the results. My muscles were always hard and I didn't lose any strength. And I did lose 4 lbs. (fat, not water) Then again it was only two weeks. This stuff will go back on the shelf until I feel the need to cut. IMO use a regular eca stack and a little andro and you'll get the same effects for a lot cheaper.