Sona D1000 Vitamin D3 1000IU (30). Sona D1000 provides 1000IU of Vitamin D3 per tablet. Vitamin D is important for the maintenance of normal bones and teeth, cell division and normal muscle function.. Vitamin D is also required for the absorption and utilisation of calcium and phosphorus, the maintenance of normal blood calcium concentrations, the normal function of the immune system and inflammation response.