Myo Inositol Vitamin D3 Tablets is a dietary supplement that contains myoinositol and vitamin D3. Myo-inositol is a naturally occurring compound that is similar to a B vitamin. It plays a role in many important cellular processes, including insulin signaling and ovarian function. Vitamin D3, also known as cholecalciferol, is an essential vitamin that is important for bone health, immune function, and the absorption of calcium and phosphorus.