I have been purchasing the optimum 100 whey goldstandard protein from Sportsfuel when a deal popped up that included the optimum amino energy sampler. I needed to get some more whey any way, so never one to turn down a good dea!? I got the sampler and trialled when best to take it; before workout, after workout; with mixed results, however with only a few servings left I tried it during my workouts, as part of my hydration. The difference for me was startling, it improved my energy levels and focus during my workouts something chronic. For me, I sometimes struggle at the start of a workout to get "into it", with this stuff, that problem no longer exists. Although the the grape flavour may not be to everyone's taste, I find it really refreshing. The amino energy powder mixes really well and I haven't had any issues with lumps or clumping in any of the concoction I have made with it. Everyone will have different results and like me I would trial what and when's the best time to take it, but for me this will become a permanent addition to my supplement regime, thanks Sportsfuel.