Vitamin B-12 (also known as cobalamin) is a water soluble vitamin found in most meat products and some other foodstuffs. It can be taken as a nutritional supplement, either on its own or as part of a multivitamin preparation. The coenzyme form (Methyl-B12) can be injected or inhaled.
Vitamin B12 has several important functions - such as making red blood cells and keeping the nervous system healthy, releasing energy from the food we eat, and processing folic acid.
Some people think that individuals on the autism spectrum have significant metabolic abnormalities which can cause or worsen the symptoms of autism.
They also think that some of those metabolic abnormalities can be addressed by taking supplements of vitamin B-12 or injecting or inhaling Methyl-B12.