Aluminum Causes Brain Damage
Even small amounts of aluminum injected can cause immediate & long term neurological injuries. 

This is a great depiction of what aluminum does to the body. 
When the same levels of aluminum used in vaccines was injected WITHOUT the vaccine the results showed;

• Massive damage to motor neurons 
• Rapid onset of behavioral issues 
• Cognitive deficits in the mice 

These neurological issues may not show themselves for many years, until they present as Parkinson's or Alzheimer's for example