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Brain Fog and Difficulty Concentrating B12 is essential for maintaining healthy nerve function, and a lack of this vitamin can impair cognitive performance

Including iron-rich foods (red meat, beans, fortified cereals) and folate sources (green vegetables, pulses, fortified bread) can support red blood cell production

Another study published in the Journal of the American Geriatrics Society found that B12 supplements improved memory and cognitive function in older adults with mild cognitive impairment

NNMT inhibition as a metabolic and epigenetic research target

Some people use sublingual delivery (powder held under the tongue briefly before swallowing) but there's no strong evidence this meaningfully improves bioavailability for this compound class