The Safe Upper Limit
The National Institutes of Health (NIH) has set a tolerable upper intake level (the highest daily dose unlikely to cause adverse effects) for vitamin D at 4,000 IU (100 micrograms) per day.4
Research shows that vitamin D toxicity can occur with prolonged daily intake above 10,000 IU, though the exact threshold can vary between individuals.5
Prevention and Safety
Vitamin D toxicity is preventable and starts with smart supplement habits. Here’s how to stay safe:
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