The 78-year-old admits her memory is not as sharp as it used to be, so she relies on a supplement recommended to her by a university professor in order to help boost her recall skills, reported Contactmusic.
"I don't know how I retain it. I take that wonderful thing called Eye Q every morning because the Master of Magdalen College Cambridge told me about it ages ago and he said, 'Oh you should take that for your memory, it's wonderful' and I've taken it ever since.
Last year, Dench said she relied on her daughter Finty to read scripts to her because she is suffering from macular degeneration - an age-related condition which affects the retinas.
"I can't read scripts anymore because of the trouble with my eyes. And so somebody comes in and reads them to me, like telling me a story. It's usually my daughter or my agent or a friend and actually, I like that, because I sit there and imagine the story in my mind.