Calcium tablets are essential. If conditions are good, bird's nest will be early or something. The supplements in the big supermarket are all in buy buy. If you eat seafood (fish is better), black-bone chicken and various vegetables, don't always eat pork and mutton. If you can't digest well, you should supplement all kinds of soup porridge, tonic soup or vegetarian soup, scrambled eggs with tomatoes. Mainly tomatoes make up.