There's no reason to avoid caffeine. It's a very stress protective substance. Coffee with a little bit of sugar is a great way to sustain concentration far long

There's no reason to avoid caffeine. It's a very stress protective substance. Coffee with a little bit of sugar is a great way to sustain concentration far longer than you otherwise could. If one is adapted to it, it does not make one jittery. Another lesser known chemical trick is aspirin. Aspirin boosts energy, mood, and concentration. Some days I down nearly three grams. I find it works synergistically with coffee.