What is the recommended daily intake range of vitamin D?

What is the recommended daily intake range of vitamin D?

• A. 100-200 IU
• B. 400-600 IU
• C. 1000-1500 IU
• D. 2000-4000 IU

Answer: (B)

Vitamin D needs help support calcium absorption and healthy bones, and for most healthy adults the standard daily maintenance amount is 400 to 600 international units. This range reflects what’s typically sufficient for people who get a mix of sun exposure, dietary vitamin D, and, when needed, supplements, to keep vitamin D status in a healthy range. Lower intakes, like 100–200 IU, are generally not enough for maintaining adequate levels in many adults. Higher amounts, such as 1000–1500 IU or 2000–4000 IU, aren’t the usual daily maintenance targets; they’re more often used when there’s limited sun exposure, older age, or a diagnosed deficiency, and they can approach or exceed safe daily intake levels if taken without supervision.

Vitamin D needs help support calcium absorption and healthy bones, and for most healthy adults the standard daily maintenance amount is 400 to 600 international units. This range reflects what’s typically sufficient for people who get a mix of sun exposure, dietary vitamin D, and, when needed, supplements, to keep vitamin D status in a healthy range.

Lower intakes, like 100–200 IU, are generally not enough for maintaining adequate levels in many adults. Higher amounts, such as 1000–1500 IU or 2000–4000 IU, aren’t the usual daily maintenance targets; they’re more often used when there’s limited sun exposure, older age, or a diagnosed deficiency, and they can approach or exceed safe daily intake levels if taken without supervision.