Study finds potential link between daily multivitamin and improved cognition

Amazingly this was actually a randomized controlled double blind study. (And it wasn't in mice.)

I can't figure out why they say more investigation is necessary. Was the effect size not large enough?

I wonder what the multivitamin was.

The paper mentions the MVM was Centrum Silver [0].

Study finds potential link between daily multivitamin and improved cognition (cnn.com)