- Kidney stones
- Kidney pain
- Reduced kidney function
- In severe cases, kidney failure
Mayo Clinic specifically notes that vitamin D toxicity can lead to kidney stones and kidney trouble. ([Mayo Clinic][1])
How Much Vitamin D Is Too Much?
For most adults, the tolerable upper intake level is 4,000 IU (100 micrograms) per day from all sources unless a healthcare professional recommends a higher dose for a specific reason. ([ODs][2])
That does not mean 4,001 IU is automatically toxic. Toxicity usually happens with much higher intake or inappropriate long-term supplementation.
Doctors sometimes prescribe doses above the usual upper limit temporarily to treat deficiency, but that is typically done with monitoring.
Can You Get Vitamin D Toxicity From the Sun?
No, not under normal circumstances.
Your skin regulates how much vitamin D it makes from sunlight, so excessive sun exposure does not usually cause vitamin D toxicity. ([Mayo Clinic][1])
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The problem is almost always too much vitamin D from supplements, especially high-dose products taken repeatedly.
