In the context of vaccination chelation with carnosine may be crucial, as it removes organic mercury (thiomersal or thimerosal) from a child. Organic mercury is present in most vaccines as an antimicrobic preservative, although it since the 1930´s has been recognised as a toxic substance affecting the central nervous system. In my opinion every vaccinated child and adult should take carnosine as a precaution in order to remove thiomersal from the body as soon as possible.