Reductase is an enzyme that facilitates reduction reactions in biological systems. These reactions involve the gain of electrons or hydrogen atoms, which can convert oxidized molecules into their reduced forms. Reductases play a crucial role in various metabolic processes, including the synthesis of fatty acids and the detoxification of harmful substances. There are different types of reductases, such as NADH reductase and cytochrome P450 reductase, each with specific functions and substrates. These enzymes are essential for maintaining cellular balance and supporting energy production, making them vital for overall health and metabolic efficiency.