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Question: Does vitamin B12 improve memory?
Answer: Supplementing daily with vitamin B12 (100 mcg to 500 mcg) and, possibly, folic acid (400 mcg), may help slow age-related declines in memory and cognition if you're not already getting enough vitamin B12 from your diet or not able to extract it from foods -- a common problem in older people.
The benefit may be enhanced when you're also getting a good amount of omega-3 fatty acids (DHA and EPA), such as from oily fish. Getting the recommended daily allowance of B6 (about 1.7 mg), which is easily obtained from foods, is also important.