Supplements for Cognitive Health
Introduction to Recommendations
- The American Heart Association recommends consuming fatty fish 2-3 times weekly for general brain health 5
Key Recommendations by Supplement Type
- Do not use omega-3 supplements in persons with established dementia, as high-quality evidence shows no benefit for cognitive or functional outcomes when combined EPA and DHA are given for 6-18 months 1, 2, 3
- Omega-3 supplements may be considered in mild cognitive impairment only, with some evidence suggesting potential benefits in specific domains when used for 6-12 months 4, 5
- DHA appears more important than EPA for brain health, with doses of 2-3g/day combined omega-3s showing the most promise 5
- Achieving an omega-3 index ≥4% in blood appears necessary for any cognitive benefits 5
- Do not recommend B vitamin supplementation unless documented deficiency exists, as evidence from multiple high-quality trials shows no benefit on cognitive decline, dementia incidence, or functional outcomes 1, 2, 3, 4
- Do not recommend vitamin E supplementation for cognitive protection, as high-quality evidence from a large trial showed no effect on progression from MCI to Alzheimer's dementia over 3 years with 2000 IU daily 4, 6
- Do not recommend routine supplementation with vitamin D, vitamin C, selenium, copper, or other single micronutrients for cognitive enhancement, as no controlled intervention studies have demonstrated cognitive benefit in persons without documented deficiency 1, 2, 3, 6
Clinical Approach
- Screen for malnutrition, malabsorption disorders, metabolic conditions, or severely unbalanced diets that could cause true nutrient deficiencies, and consider individual assessment for specific deficiencies in persons with dementia or cognitive impairment 1, 2, 3
- If specific deficiency identified, supplement that nutrient at normal therapeutic doses, and monitor for potential toxic effects of high-dose supplementation 1, 2, 3