Neurotoxins are toxins that are poisonous or destructive to nerve tissue (causing neurotoxicity). Neurotoxins are an extensive class of exogenous chemical neurological insults that can adversely affect function in both developing and mature nervous tissue. Common examples of neurotoxins include lead, ethanol (drinking alcohol), manganese glutamate, nitric oxide, botulinum toxin (e.g. Botox), tetanus toxin, and tetrodotoxin. Some substances such as nitric oxide and glutamate are in fact essential for proper function of the body and only exert neurotoxic effects at excessive concentrations.
Neurotoxins inhibit neuron control over ion concentrations across the cell membrane, or communication between neurons across a synapse. Local pathology of neurotoxin exposure often includes neuron excitotoxicity or apoptosis but can also include glial cell damage. Macroscopic manifestations of neurotoxin exposure can include widespread central nervous system damage such as intellectual disability. persistent memory impairments, epilepsy, and dementia. 
Vaccination and Neurotoxins
Different vaccines contain different ingredients that can include lab altered live or inactivated viruses and bacteria, chemicals, metals, proteins, antibiotics and human, animal and insect DNA and RNA. Individual responses to vaccinations are based upon the weak genetic link in the person, but adverse reactions can always be linked directly to harm the bio-neurology from the introduction of Neurotoxins to the bloodstream. Each person’s unique genetic makeup will respond to the neurotoxin with different physical symptoms that can be classified in a range of clinical diseases.