Generally speaking, if an individual wishes to select a pre-workout, simply know that the most effective ingredients will be caffeine, guarana (simply more caffeine),
ephedrine or its various
alkaloids, and certain natural forms of aspirin or anti-inflammatory.
These products contain varying amounts of the ephedra
alkaloids ephedrine and pseudoephedrine; when combined with St. John's wort, supplements containing these chemicals are supposed to help a person with weight loss.