Natto has no medicinal properties, but has the ability to replenish protein and other nutrients. Natto contains a large amount of vitamin K₂, dietary fiber, protein, carbohydrates, sodium, isoflavones, calcium, potassium, amino acids and other ingredients. Each 100 grams of natto contains 212 calories, of which 17.72 grams of protein, 11 grams of fat, 14.36 grams of carbohydrates, 13 milligrams of vitamin C, 217 milligrams of calcium, 8.6 milligrams of iron. Natto can replenish the nutrients needed by the human body and maintain normal physiological functions. It can also increase one’s appetite, as well as satiety. For patients with chronic renal insufficiency, they need to limit protein intake and cannot consume large amounts of soybean products such as natto to avoid aggravating their condition. And because the purine content in natto is also relatively high, it is recommended that patients with gout attacks and severe hyperuricemia eat as little as possible. Those who are allergic to soy should not eat natto.