You’re Paying for 3 Popular Supplements Scientists Now Suspect Could Hurt Your Aging Brain

Key Points:

• About 76% of adults over 60 take dietary supplements, with fish oil, vitamin D, and glucosamine among the most common, but new research questions their effectiveness and safety for brain health.
• A USC study found that fish oil supplements raised brain DHA levels but did not improve memory or prevent brain shrinkage in older adults at risk of Alzheimer’s, and some observational studies suggest omega-3s may even accelerate cognitive decline.
• Research from the University of Florida linked glucosamine use to a 25% higher risk of dementia progression and death in people with dementia, though causation has not been established and clinical trials are needed.
• Concerns about vitamin D increasing dementia risk stem from a study on a prescription drug form, not over-the-counter supplements; other trials show no effect on dementia, though excessive vitamin D intake can cause health issues and interact with medications.
• Experts recommend consulting doctors before stopping supplements, reviewing all supplement use if cognitive issues arise, and focusing on proven brain health strategies like regular exercise, balanced diet, and good sleep rather than relying on unproven supplements.