L(-)-Glutamic acid is widely used in the food industry as a flavor enhancer and key component of monosodium glutamate (MSG), amplifying umami and savory tastes in dishes. In pharmaceuticals, it acts as a nutrient supplement, aids in protein and amino acid synthesis, and serves as a precursor in neurological applications due to its role as a major excitatory neurotransmitter in the brain, supporting research on memory, learning, and cognitive functions. In cosmetics, it is incorporated into skincare products as a humectant to enhance moisture retention and improve skin condition. Additionally, it is employed in agriculture as a component in fertilizers to promote plant growth and stress resistance, and in biotechnological fermentation processes to produce amino acids and other valuable compounds for pharmaceutical and agricultural uses.