Popular brain-boosting supplements may speed brain aging, doctors warn

US doctors warn that popular brain-boosting supplements may age the brain, flagging six risky supplements or combinations—such as high-dose vitamin E, turmeric and ashwagandha, and fish oil with ginkgo and garlic—that can raise bleeding risk or cause liver waste buildup. Zinc with copper, coffee plus stimulants, and kratom are also cautioned. With little proven benefit, experts advise prioritizing a healthy lifestyle and using supplements only after blood tests show a deficiency and under medical supervision.