High supplemental vitamin D intake can cause adverse effects. Compare your label total with the cited formal regional UL where the current dataset has a verified entry.
Excess vitamin D can raise blood calcium (hypercalcemia), causing kidney stones, nausea, and heart rhythm issues.
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| United States | 600 IU | 4000 IU |
| European Union | 600 IU | 4000 IU |
| Australia | 200 IU | 3200 IU |
| China | 400 IU | 2000 IU |
| Japan | 360 IU | 4000 IU |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. “Not established” does not mean unlimited intake is safe.
Upper intake references differ by region: 4,000 IU/day for adults in the US, EU, and Japan; 3,200 IU/day in Australia and New Zealand; and 2,000 IU/day in China. These population-level references are screening boundaries, not a diagnosis or an individualized safety conclusion.
Symptoms include nausea, vomiting, weakness, frequent urination, and kidney stones. Severe cases can cause abnormal heart rhythms and kidney damage due to calcium buildup. If you experience these symptoms while taking vitamin D supplements, stop and consult a doctor.
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