Norepinephrine and Dopamine are key neurotransmitters for the maintenance of alertness and mental acuity and for promoting a feeling of general well-being. These two neurotransmitters are produced in the body from amino acid precursors primarily L-Tyrosine and L-Phenylalanine. This conversion process also requires Vitamins C and B-6 as cofactors. NOW® True Focus™ combines these important nutrients with other ingredients like Ginkgo biloba and DMAE to maximize mental agility without the stimulating side effects of caffeine or ephedra. 90 capsules.