Research
Micronutrients & recovery
There is no global consensus on optimal vitamin D status, with definitions of deficiency and insufficiency varying significantly between organizations, leading to inconsistent prevalence estimates.
Be aware that 'vitamin D deficiency' and 'optimal levels' are defined differently by various health organizations. This makes it difficult to compare studies and determine a single 'perfect' blood level for everyone.
StrongQualifiesHIGH confidence
Globally, there is a general consensus that blood 25(OH)D levels below 25 nmol/l (or 10 ng/ml) qualify as ‘deficient’, but beyond this there is currently no standard definition or agreement as to ‘optimal’ 25(OH)D levels.
Why this rating
Based on the review of various organizational guidelines (IOM, WHO, Endocrine Society, etc.).
Source
Vitamin <scp>D</scp>: An overview of vitamin <scp>D</scp> status and intake in <scp>E</scp>urope
A. Spiro et al. · Nutrition Bulletin · 2014
DOI 10.1111/nbu.12108
narrative_reviewCited 618×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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- Prevention of vitamin D deficiency is a public health priority in Europe, as deficiency is easily treatable and its prevalence is unacceptable.Good
- Vitamin D status is determined by a combination of cutaneous synthesis via UVB exposure and dietary intake, with significant variation based on latitude, skin pigmentation, and lifestyle factors.Good
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