My own past reactions probably shape how I see things, since I spent twelve months feeling sick and run down on a small amount of the first medication before switching to something else that caused far fewer problems. At this point I really don't consider that initial option a sensible place to begin, because its only real advantage is being the least expensive choice. With newer versions available I see little reason to pick it, aside from maybe adding a tiny amount on top of higher amounts of the stronger ones when extra fat reduction is needed. For anyone with notable heart or kidney trouble it does have more research behind it, simply because it has been available longer. The middle option delivers greater fat reduction with milder reactions, so there is no solid case for choosing the first one instead. Tolerance to these compounds seems uncommon or nonexistent, and the notion of beginning with one then changing when progress stalls comes from online talk rather than data. Nothing predicts in advance whether any given person will lose more or less than average, and moving between them only raises the odds of an unwanted reaction without improving results. Nothing shows one version protects muscle better than the others during fat loss either. Some lifters favor the newest compound, yet studies do not back that preference. Eating plenty of protein along with lifting weights actually helps, while the specific medication probably does not.