Vitamin D for Nutritional Deficiency Cognitive Impairment
BVitamin D deficiency is identified as a critical risk factor for cognitive decline. 40% of geriatric memory clinic patients are D-deficient. Co-supplementation with B12 and folate appears to provide synergistic cognitive support.
The Bottom Line
Vitamin D deficiency is identified as a critical risk factor for cognitive decline. 40% of geriatric memory clinic patients are D-deficient. Co-supplementation with B12 and folate appears to provide synergistic cognitive support.
Key Study Findings
Population: Elderly participants aged 60+ from NHANES 2011-2014
Population: Pregnant women (review)
Population: Patients with mild cognitive impairment
Population: Rat model
Population: None
Key Statistics
20
Studies
4500
Participants
Positive
Grade
Referenced Papers
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- general:
- 600-2,000 IU/day
- deficiencycorrection:
- 4,000-5,000 IU/day
Upper limit: 4,000 IU/day (IOM); 10,000 IU/day (Endocrine Society upper safety)
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Positive | 2582 |
| None | -- | Positive | -- |
| None | -- | Positive | -- |
| 75 mg | -- | Neutral | -- |
| None | -- | Positive | -- |
| 4 capsules daily, each containing: beta-glucan 250 mg + vitamin D3 3.75 µg + vitamin B6 1.05 mg + zi | 36 weeks | Positive | 65 |
| None | -- | Negative | 90 |
| 50000 IU/week | 9 weeks | Positive | 619 |
Best taken: With meals containing fat; morning preferred
Safety & Side Effects
Reported Side Effects
- ⚠ Hypercalcemia at very high doses
- ⚠ Nausea and vomiting
- ⚠ Kidney stones (rare, high doses)
- ⚠ Weakness and fatigue
Known Interactions
- ● Corticosteroids (reduce calcium absorption)
- ● Statins (both affect cholesterol pathways)
- ● Thiazide diuretics (additive calcium retention)
- ● Weight loss drugs (may reduce vitamin D absorption)
Tolerable upper intake: 4,000 IU/day (IOM); 10,000 IU/day (Endocrine Society upper safety)
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Vitamin D help with Nutritional Deficiency Cognitive Impairment?
How much Vitamin D should I take for Nutritional Deficiency Cognitive Impairment?
Are there side effects of Vitamin D?
How strong is the evidence for Vitamin D and Nutritional Deficiency Cognitive Impairment?
Related Evidence
Other ingredients for Nutritional Deficiency Cognitive Impairment
Vitamin D for other conditions
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.