In 2006 it was announced that Nestlé was removing all artificial colourings from Smarties in the United Kingdom. Nestlé decided to replace all synthetic dyes with natural ones, but, unable to source a natural blue dye, removed blue Smarties from circulation (which led to the common misunderstanding that the blue Smartie triggered hyperactivity in some children) and replaced them with white ones. In February 2008, blue smarties were reintroduced using natural blue dye derived from the cyanobacterium spirulina instead of the controversial Brilliant Blue FCF (FD&C Blue 1, E133).