The pre-workouts I 've tried from Optimum Nutrition , JYM , and Kaged Muscle contain between 175 milligrams ( Optimum Nutrition ) and 300 milligrams of caffeine per serving ( Kaged Muscle ) .
我从最佳营养，JYM和KagedMuscle这些品牌中所尝试的锻炼前增补物中，（最佳营养）每份含有175毫克咖啡因，（KagedMuscle）每份含有300毫克咖啡因。
jym