Pre exercise is more than just energy for the gym. Most all pre workout dietary supplements contain some kind proven muscle builder like creatine as we already mentioned or Citrulline Malate which has been shown to augment muscle volume and power. Another good muscle building component you’re going to find in pre workouts is Beta Alanine. Beta Alanine is nice for cutting back muscle fatigue and reviews have shown it to significantly increase lean muscles and decrease fat in wrestlers.
They also comprise additives like caffeine to provide you with more energy for your exercises in addition to Betaine Anhydrouse which does many stuff adding decreasing fatigue, expanding strength and HGH and in addition reducing cortisol levels.