Question explored with the scientific record
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- 1 Recommended dosage Vitamin D supplement for elderly for bone health
- 2 What is 800 IU in micrograms?
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What is 800 IU in micrograms?
The short version: 800 IU of vitamin D equals 20 micrograms.
The conversion is fixed: 1 microgram of vitamin D equals 40 IU. So 800 IU divided by 40 gives you 20 micrograms. This is a unit conversion, not a medical judgment, and the retrieved studies do not state this ratio directly—it is standard pharmacology, not a finding from these records.
The retrieval here is thin for the conversion itself. The studies cover vitamin D dosing effects, not the IU-to-microgram relationship. One record shows 600 IU/day maintained blood levels in older adults [3], and another shows 800 IU/day was tested in care-home residents [1], but neither gives the conversion factor. The case report of an infant given 40,000–50,000 IU/day [2] illustrates how dose errors happen when products differ in concentration per drop, which is the practical risk behind this question: knowing the microgram equivalent matters when comparing supplements.
For context, 20 micrograms is a common daily dose for elderly bone health, though the evidence for fracture prevention in healthy community-dwelling seniors is weak, as the prior answer noted. The conversion itself is not in dispute.
My call: 800 IU equals 20 micrograms, exactly. Confidence: high.
Sources used 3
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Vitamin D production after UVB exposure – A comparison of exposed skin regions
In a within-subject study of 10 healthy Caucasian adults, three skin regions were exposed to suberythemic UVB doses to compare vitamin D production, revealing that larger exposed areas generate greater increases in cholecalciferol and 25(OH)D3, while face/hands can modestly rais…
DOI: 10.1016/j.jphotobiol.2014.12.026 -
Case Report: Severe Hypercalcemia Following Vitamin D Intoxication in an Infant, the Underestimated Danger of Dietary Supplements
A 3-month-old infant developed severe symptomatic hypercalcemia after a 50-fold vitamin D overdose caused by substituting prescribed ZymaD with a high-concentration dietary supplement.
DOI: 10.3389/fped.2022.816965 -
The Effects of Vitamin D-Enriched Mushrooms and Vitamin D3 on Cognitive Performance and Mood in Healthy Elderly Adults: A Randomised, Double-Blinded, Placebo-Controlled Trial
In healthy older adults, 24 weeks of vitamin D3 (~600 IU/day) maintained 25-OH-D, but neither D3 nor vitamin D2-enriched mushrooms improved cognition or mood versus placebo.
DOI: 10.3390/nu12123847