Multivitamins are widely used supplements, but their effects on cognitive function are not fully understood. A recent randomised clinical trial published in Alzheimer's & Dementia investigated the effects of a multivitamin on cognitive function in older adults.

The trial included 2 262 participants aged 65 years or older who were cognitively healthy at baseline. Participants were randomly assigned to receive a daily multivitamin or a placebo for three years. Cognitive function was assessed at baseline and annually for three years...