Calcium supplements are categorized into food supplements and medicine supplements. Calcium-rich foods mainly include fish and seafood, beans and soy products, eggs, dairy products, etc. Calcium supplements mainly include calcium gluconate, calcium lactate and so on. 1. Calcium supplementation through food: (1) fish and seafood: 100 grams of sardines containing 184 mg of calcium, 100 grams of river shrimp containing 325 mg of calcium, 100 grams of shrimp containing 990 mg of calcium. (2) beans and soy products: 100 grams of soybeans containing 191 mg of calcium, 100 grams of tofu containing 160 mg of calcium, 100 grams of vegetarian chicken containing 319 mg of calcium. (3) Eggs: 100 grams of eggs contain 110 mg of calcium, 100 grams of duck eggs contain 65 mg of calcium. (4) Dairy products: every 100 milliliters of milk contains 105 milligrams of calcium, every 100 milliliters of yogurt contains 120 milligrams of calcium. 2. Calcium supplements: Calcium supplements mainly include organic calcium and inorganic calcium. Organic calcium mainly includes calcium gluconate, calcium lactate, etc.; inorganic calcium mainly includes calcium carbonate. Generally, you can take calcium supplements through preventive food, and you can also take food supplements for mild calcium deficiency, but you need to take medication for calcium supplements under the guidance of your doctor for moderate to severe calcium deficiency.