Glutamate is an amino acid that plays a crucial role in the brain as a neurotransmitter, which means it helps transmit signals between nerve cells. It is the most abundant excitatory neurotransmitter in the central nervous system, meaning it promotes the activation of neurons. Glutamate is essential for various brain functions, including learning and memory. In addition to its role in the brain, glutamate is also found in many foods, such as meat, fish, and dairy products. It is often used as a flavor enhancer in cooking, commonly known as monosodium glutamate (MSG). While generally recognized as safe, some individuals may experience sensitivity to MSG.