(it's a small amino acid, passively absorbed) -- 1-3g 1-3x/day. Metabolic Maintenance makes Glycine Sticks which contain 3g, about $8 for 30 at Natural Partners. VERY slick when you need it away from home! Beyond A Century ( www.beyond-a-century.com ) has inexpensive powder. Tyrosine is another amino acid, but instead of being an inhibitory neurotransmitter, it creates Epinephrine (Adrenaline), Norepinephrine, and thyroid hormone. You might think that it would make you more distractable, but it actually helps focus (especially in ADHD) and as a side benefit, increases Dopamine which will aid motivation and low-catecholamine depression. 1g-2g 1-3x/day away from food. Cholinergics -- as previously mentioned. They really help to hone focus. Speed and processing are largely determined by having the right mental state and the right fuel. The previous dietary suggestions will reduce fog, and the remaining is for cholinergics and caffeine in my opinion. Getting pumped to fast music is my personal favorite, which unfortunately I could not do during Boards! Endurance is mostly about fuel and timing. A short competition or exam won't require you to be in the zone for long, but if you are trying to stay "on" for longer periods of time, eating small meals spaced throughout the day will keep blood sugar more stable. Eating healthy fats and proteins is extremely important. As mentioned before, taking cholinergics spaced out over the day will also help. Creativity is somewhat improved by cholinergics. I've heard good reports from people utilizing Phenylethylamine (PEA), but dosing varies and