“The dietary supplement creatine – known to improve athletic performance – can also boost memory and intelligence, researchers claim.

The supplement is favoured by some athletes

Creatine is a natural compound found in muscle tissue, and has been popular with athletes looking for ways to increase fitness.

However, experts say that it has a role in maintaining energy levels to the brain, and have the theory that taking more creatine might actually improve mental performance.” BBC

And: Not only intelligence pills but ‘intelligent pills’ The Age