Glutamic acid is one of 20 amino acids that are crucial to the human body's proper functioning. Without it, we would die, but it is referred to as a nonessential amino acid because our bodies can produce all we need on their own, and we don't depend on consuming it directly with our food. Glutamic acid is found throughout our bodies, where it is crucial to cell metabolism. In the brain, it is an important neurotransmitter, regulating learning and memory. Every second in our heads, quadrillions of microscopic glutamate bombs explode every time a neuron fires, passing electrical signals through our synapses.