Kalsiyum, or calcium, is a vital mineral that plays a crucial role in maintaining strong bones and teeth. It is essential for various bodily functions, including muscle contraction, blood clotting, and nerve transmission. The body cannot produce calcium on its own, so it must be obtained through diet or supplements. Good dietary sources of kalsiyum include dairy products like milk, cheese, and yogurt, as well as leafy green vegetables, nuts, and fortified foods. Adequate intake of kalsiyum is important for people of all ages, especially children and the elderly, to prevent conditions like osteoporosis and ensure overall health.