If you are under thirty and have osteoporosis, calcium supplementation is very important. First, increase your calcium intake through diet by consuming foods rich in calcium, such as milk, cheese, yogurt, tofu, leafy green vegetables, and nuts. Secondly, consider taking calcium tablets or vitamin D supplements, as vitamin D helps the body absorb calcium more effectively. Additionally, moderate sunlight exposure can help your body produce vitamin D. Lastly, maintain regular exercise, especially weight-bearing exercises like brisk walking, running, and weightlifting, to help strengthen your bones. Remember, lifestyle adjustments and professional medical advice are equally important.