Vitamin D is different from most other vitamins. When the body processes it, vitamin D becomes a hormone called calcitriol, which makes bones in the body absorb calcium.
Vitamin D intake is recommended at 400–800 IU/day, or 10–20 micrograms. However, some studies suggest that a higher daily intake of 1000–4000 IU (25–100 micrograms) is needed to maintain optimal blood levels.
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