I used Cutler's Amino Pump caffeine free pre-workout for years until it was discontinued and replaced with this one. Unfortunately, there isn't the same pump as the old formula. I haven't noticed much of a difference in muscle blood flow than just drinking water. In fact, out of all the ingredients, only 3 are useful: creatine, taurine, L-citrulline. Creatine can be bought separately for 1/3 the price and the other two ingredients are not very effective ingredients either. This tells me that this is basically the glorified flavored creatine. Most of the ingredients in the old Cutler Amino Pump pre-workout are now in the "GENERATE AMINO MATRIX" formula his company sells. Ironically, it is now marketed as a post-workout supplement. I'll give it a try and hope it still works well as a pre-workout, but if not, it's time to find another decaffeinated pre-workout that actually works.
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