Patients with chronic nephritis can take vitamins, but they only need to be supplemented if they are deficient. If the body is not deficient in vitamins on its own, not only will it not have a beneficial effect on health, but it will be harmful to health. You cannot take vitamins on your own, especially fat-soluble vitamins, such as vitamin A, vitamin D, vitamin K, etc. If you take too many fat-soluble vitamins on your own, it is very easy to cause the accumulation of vitamins in your body, thus causing poisoning. If you are a patient with chronic nephritis, if your condition is serious or the disease lasts for a long time, there may be hypocalcemia, and some patients will have vitamin D deficiency, so proper supplementation of vitamin D is good for calcium, but before supplementing vitamin D, you need to go through a blood test and have vitamin D deficiency before supplementing, not on your own.