Who’s suppliments are you using, and are they doing the job right?
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From all possible supplements I prefer glutamine, as it helps muscles to regenerate faster. I prefer it to pre and post workouts because it does not give you extra energy for workout, but you stay in gym as much as you can and still keep your muscles ready for next day workout.
From all the possible glutamine powder providers I prefer OPTIMUM NUTRITION, as all their other bodybuilding supplements, that’s a great brand, you may read a review at http://testozilla.com/supplements/best-glutamine