Pure Encapsulations' Inositol provides 4.1 g of inositol per serving. Inositol is a component of the B-complex family. Myo-inositol is the primary form of inositol found in the central nervous system. It plays an important role in cell membrane formation and serves as part of the phosphatidylinositol second messenger system, supporting serotonin, norepinenephrine and cholinergic receptor function. As a result, inositol may support healthy mood, emotional wellness and behavior and help lessen occasional nervous tension. Inositol supports healthy central nervous system function, including emotional wellness and mood, and may also support ovarian health.