What are calcium tablets made of?

Calcium is one of the most common elements in the human body. It is called reinforced concrete in life. Calcium content in the human body accounts for 1.52% of the total body weight. It plays a vital role in human metabolism, cell function, nervous system operation, protein hormone synthesis, etc. After the age of 35, the human body will accelerate calcium loss. If the amount of calcium is insufficient, it will show calcium deficiency symptoms, mainly manifested as backache, shortened height, hunched back; joint swelling, persistent pain, easy fracture; loose teeth; hypertension, dizziness, insomnia, etc.