Vitamin D-3, also called cholecalciferol, is an essential nutrient your body requires in order to properly absorb calcium from calcium-rich foods you ingest. If you have low vitamin D levels, your doctor may recommend treatment with a vitamin D-3 supplement. Be sure to discuss the adverse side effects of vitamin D-3 with your health care provider before taking this nutritional supplement.
Increased Urination
Increased urinary frequency is a potential adverse side effect associated with vitamin D-3 treatment, RxList warns. You may also notice that you excrete a larger volume of urine than usual. Excessive fluid loss from the body caused by increased urination may also result in increased thirst. You may drink more fluid than normal, which may exacerbate adverse urination side effects.
Difficulty Breathing or Chest Discomfort
You may develop breathing difficulties, such as shortness of breath, while taking vitamin D-3, Drugs.com reports. Shortness of breath may also cause chest pain or discomfort. If these adverse side effects occur, seek medical care immediately. Breathing difficulties and chest pain may also be signs of alternate medical problems, such as a heart attack.
Cognitive or Behavioral Changes
Elevated levels of vitamin D-3 in your body may induce cognitive or behavioral changes. You may find it difficult to concentrate or remember certain information, or you may feel unusually irritable or cranky. Talk with a doctor immediately if these side effects arise during vitamin D-3 treatment.
Overdose Symptoms
If you take too much vitamin D-3, you are at risk of developing overdose symptoms as adverse side effects of this nutritional supplement. Overdose symptoms include weakness, constipation, bone or muscle pain, nausea, vomiting or an unusual metallic taste in your mouth. Contact your medical provider immediately if you develop overdose symptoms while taking vitamin D-3.



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