Is there any supplement that can increase intelligence?

Creatine monohydrate increases general cognitive abilityA team of biochemists and a cognitive psychologist led by Dr. Caroline Rae at the University of Sydney have demonstrated that creatine monohydrate can increase intelligence substantially. Taking 5 grams of creatine daily for 6 weeks improves fluid intelligence by 40% on average on a validated IQ test. These results were published in the Proceedings of the Royal Society: Biological Sciences in 2003. The reference can be found here:

Rae, C., Digney, A.L., McEwan, S.R. & Bates, T.C. (2003). Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proc. R. Soc. Lond. B, 270, 2147-2150.