Understanding Vitamin D Toxicity: Signs and Risks

8. Upset Stomach

Vitamin D is active in the stomach and intestines where it improves the absorption of calcium and phosphorous. Symptoms of vitamin D toxicity can also occur in the digestive tract. Some people develop gastric ulcers while taking oral vitamin D supplements, especially at high doses.

Hypercalcemia can cause nausea, vomiting, and loss of appetite. Other common symptoms include bloating, constipation, and abdominal pain. It's important to note that an upset stomach isn't always a symptom. Many people feel nauseous after taking medications or supplements.