At the age of 20, taking calcium tablets is generally unable to grow taller, but if the epiphyses are not completely closed, they may grow taller. At present, clinical research data show that most people in the development of 18 years old, epiphysis has been completely closed, the case, even if you take calcium tablets can not continue to grow taller. But there are some 20-year-olds whose epiphyses are not yet completely closed, in which case, taking calcium tablets can help them grow taller. For those whose epiphyses have completely closed at the age of 20, taking calcium tablets can only help the body to supplement calcium and increase nutrition. At the same time, during the period of taking calcium tablets, do not blindly consume, generally take more than 200mg, it will reduce its absorption rate. And, during the taking of calcium tablets, some people will also take vitamin D, so as to promote the absorption of calcium, but also should not be overdosed. If patients overdose on calcium tablets, it may cause irritation to the gastrointestinal tract, inducing belching (burping), constipation and other symptoms. Vitamin D may lead to vitamin D toxicity if overdosed for a long period of time. In summary, after the age of 20 years old generally can not grow taller, taking calcium tablets is useless, the above medication should be used under the guidance of a doctor.