Version 1 worked way better for me. Somuch energy, great cognitive function. Could be different for each individual but I was so disappointed with the effect compared to version 1.
This version 2 takes longer to kick in, and when it does, you are a pool of sweat.Gives you a boost of energy but that's about it. So for that reason, it's not nice to take on a non-working out day.
Version 1 you could take it on your non training days too without ending up in a pool of sweat!