Medicine

Popular Supplements May Damage Aging Brains, Scientists Warn

How the science connects

AgingCognitive declineDietary supplement

AI Insight

Recent studies have found associations between commonly used dietary supplements (vitamin D, fish oil, and glucosamine) and cognitive decline in older adults, challenging the widespread belief that these supplements support brain health. The findings suggest that supplements many people take specifically for cognitive benefits may potentially have unexpected negative effects on brain function as people age. This represents a significant shift from conventional wisdom about supplement safety and efficacy for brain health.


Millions of older adults regularly consume these supplements believing they support cognitive health, so evidence of potential harm could affect public health recommendations and individual supplement choices. The findings highlight the need for more rigorous research on long-term supplement effects and careful consideration of supplement use, particularly in aging populations.


You reach into your pantry for a bottle of vitamin D. Then get some fish oil capsules from the fridge. Gulp! What’s a little fish burp for a healthier brain, right? But then you see the headline: Studies link vitamin D, fish oil and glucosamine to cognitive decline in older adults. Say what?

Source: Trusted supplements in the hot seat: Could they harm the aging brain?