25-OH Vitamin D
Standard Reference Range
See Lab Results
Optimal Cognitive Range
40–60 ng/mL
Clinical Significance
Severe deficiency doubles dementia risk
Clinician Discussion
Often not included in basic screening panels; request if experiencing brain fog or related symptoms. Optimal ranges for cognitive performance may differ from standard laboratory ranges.
Potentially Related Causes
Abnormal results may indicate involvement of these underlying conditions:
Nutrient Deficiencies
Vitamin D status
Autoimmune Conditions
Immune modulation
Depression
Mood regulation
Click any cause above to learn about symptoms, tests, and evidence-based interventions.
This information is for educational purposes only. Always consult with a qualified healthcare professional.