Calcium citrate, Vitamin D3, zinc sulphate, and magnesium hydroxide tablets are used to treat calcium and vitamin D deficiencies, support bone health and strength by increasing bone density, and aid in muscle and nerve function. The combination of these nutrients helps the body absorb calcium, promotes overall growth and development, and strengthens the immune system. They are also used to help prevent conditions like osteoporosis and may be beneficial during pregnancy, lactation, and in older adults.