Doctors in the Southern U.S. are flagging a dangerous trend in 2026 involving Vitamin D toxicity. Emergency rooms are seeing patients with nausea and kidney stones caused by aggressive supplementation rather than a virus. Residents in Sun Belt states often retain high natural levels from summer, so adding winter supplements can push them into a medical danger zone.
Unlike Vitamin C, which is water-soluble and easily flushed out, Vitamin D is fat-soluble. Your body hoards it in tissues and allows it to accumulate over time. This buildup can lead to hypercalcemia, a condition where calcium levels in the blood rise to dangerous heights.
