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The most common skin disorders that a vitamin D allergy can cause include hives and eczema, according to Drugs.com. Both allergic skin conditions are extremely itchy and cause inflammation and irritation in the skin. Hives may indicate a severe allergic reaction and needs to be evaluated by a physician.
Quick Answer. The Mayo Clinic cautions that vitamin D toxicity results in hypercalcemia, a build up of calcium in the blood that causes nausea, poor appetite and vomiting. Other symptoms of vitamin D overdose are weakness, frequent urination and kidney problems. Vitamin D toxicity, known as hypervitaminosis D, occurs when people take more than 50,000 international units of vitamin D per day for more than six months. The Mayo Clinic's recommended dietary allowance is 600 IU per day, but they also point out that overdose is relatively rare.