I only recently noticed an increase in my workouts, and I’ve been through about 40 servings. I immediately noticed mental improvements, though; after a double dose, for a few minutes I felt sped up pretty good. Granted, I’ve been doing EDT style work (high volume) or 5X5, but I do notice my mood improves and, if tested, I have better recall. The first time I used it I did get buzzed in a wierd way, it felt like my head was getting washed with neurotransmitters. Helps me wake up too; considering that a scoop is cheaper than buying coffee, I’m for it.
It never made my workout, or really my physical output, more intense. Mentally and emotionally, it’s great.