We needed concentration, focusing and quick thinking not only when we study, have exams, job interviews or public speaking. These factors determine also the effectiveness of exercises. So to make the most of the potential latent in the brain make sure that the following substances are included in your supplements. Acetyl L-Carnitine increases the synthesis of neurotransmitters. Choline, which produces acetylcholine – is a substance for easy memorization. L-phenylalanine increases levels of dopamine and endorphins (eliminating the fatigue). Japanese ginkgo improves cerebrovascular system. St. John's wort raises the levels of serotonin. A Hupercyna supports memorization and prolongs concentration and focusing. Caffeine has a stimulant effect. L-glutamine is nourishing the brain directly. L-theanine is soothing stress. L-tyrosine increases synthesis of neurotransmitters. Lecithin is the source of choline. Magnesium has relaxing effect, especially recommended for those abusing caffeine. Omega-3 is essential for the proper working of the brain and nervous system.