Do antioxidant supplements slow aging?

The idea that mopping up free radicals with pills would slow aging is intuitive. But large randomized trials of high-dose antioxidant supplements have mostly failed to show the promised benefits, and some have pointed to harm at high doses.

Antioxidants from whole foods are a different story — they arrive in modest amounts alongside fibre and other compounds. The isolated high-dose pill is the part the evidence doesn't support.

Grade: Weak. This is one of the clearest 'the more it's marketed, the lower it grades' cases in the book.