Older people often take many supplements, including ones purported to help with brain health. A recent study says the supplements do not work. (Credit: Mladen Zivkovic/Shutterstock)

Americans and others around the world have turned increasingly to dietary supplements in order to maintain or preserve their brain health.

A recent study found that a quarter of adults over 50 take a supplement for brain-related health. But that same study, done by experts convened by the AARP