@Reyu Never take that stuff; it's produced in a lab and made with petroleum. Besides, your body won't absorb it because it has no nutrients, and the studies are backed by the same companies. If you want to gain weight, eat raw fat, maybe fruit juice (with raw fat).

@Reyu well if you want to get very muscular the primal diet isn't optimal its not very calorie dense, its expensive and lacks carbs.