How much does 1,000 IU vitamin D raise blood levels?

Approximately 10 ng/mL (25 nmol/L) per 1,000 IU/day on average, but response varies 2–3× between individuals based on obesity, sun exposure, and genetics.

What serum vitamin D level is optimal?

Most experts recommend 40–60 ng/mL (100–150 nmol/L) for optimal immune, bone, and muscle function; deficiency is defined as <20 ng/mL (<50 nmol/L).

Vitamin D Status: IU to Blood Level

Estimate serum 25(OH)D blood level change from supplemental vitamin D dose in IU using population pharmacokinetic models.

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Vitamin D Status: IU to Blood Level

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Frequently Asked Questions

How much does 1,000 IU vitamin D raise blood levels?

What serum vitamin D level is optimal?