Vitamin D Supplements: 4 Warning Signs You May Be Taking Too Much

does not mean 4,001 IU is automatically toxic. Toxicity usually happens with much higher intake or inappropriate long-term supplementation.

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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])
The problem is almost always too much vitamin D from supplements, especially high-dose products taken repeatedly.

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