Calcos Vitamin D3 60 Tab It is a combination of calcium and vitamin D to maintain bone strength and hardness It is used in the treatment of osteoporosis caused by calcium deficiency and vitamin D as it enhances immunity, one tablet per day or as instructed by the doctor. As a dietary supplement when the amount of calcium consumed is insufficient, CDs are very useful for the body as they are rich in proteins and rich in calcium and are thus very useful for the body as it is safe and effective.