This, coupled with many case reports of clinical improvement among autistic children upon removal of at least a small part of their whole-body load of mercury, seems to indicate that many cases of autism today are, in fact, cases of mercury poisoning. The early environmental insult, in these cases, is mercury exposure that overwhelmed the body's attempts at detoxification. First of all, mercury is ubiquitous. It is in our water supply. This form is largely unabsorbed.
Organic mercury is absorbed reasonably well by the gastrointestinal tract.
Exposure via these two routes is common, but it is far exceeded by exposure via dental amalgams and thimerosal-containing vaccines. Mercury vapor is known to be released from dental amalgams, and it is known to cross the placenta with ease. Once tightly bound via this mechanism, it is in the body for a long time. Thimerosal-containing vaccines are now given with abandon. Upon its arrival into our world, the newborn is greeted with a Hepatitis B vaccine.