Vitamin D above 4,000 IU/day may cause nausea, kidney stones, and calcium buildup. Check your dose against FDA, EFSA, TGA, CNS, and MHLW standards.
Excess vitamin D can raise blood calcium (hypercalcemia), causing kidney stones, nausea, and heart rhythm issues.
| Standard | RDA | Upper Limit (UL) |
|---|---|---|
| US (FDA) | 600 IU | 4000 IU |
| EU (EFSA) | 600 IU | 4000 IU |
| AU (TGA) | 600 IU | 4000 IU |
| CN (CNS) | 400 IU | 800 IU |
| JP (MHLW) | 600 IU | 4000 IU |
RDA = Recommended Dietary Allowance. UL = Tolerable Upper Intake Level. Exceeding the UL long-term may cause the toxicity symptoms described above.
Vitamin D toxicity is rare at doses below 10,000 IU/day for healthy adults. The UL is 4,000 IU/day (US/EU/AU/JP) and 800 IU/day (China). Toxicity usually occurs from extremely high supplemental doses over weeks or months, not from sun exposure or diet.
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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