Vitamin D3 evidence, 2011
Forrest KY, Stuhldreher WL, Nutrition Research, 2011 — NHANES analysis of vitamin D status in US adults
- Grade
- Design
- observational
- Year
- 2011
- Participants
- 4495
- Ingredient
- Vitamin D3
- Goal
- General coverage
Effect
Roughly 42% of US adults measured below 50 nmol/L 25(OH)D, with higher rates in winter and in people with darker skin.
Limitations and notes
Status data, not an efficacy claim — explains who plausibly benefits.