David said: Heavy metals certainly can affect the brain and neurological function. It does not seem they are the primary contributing factors for either Alzheimers or Parkinson (pesticide exposure seems to be a greater factor for this). There are certainly substances that can help promote excretion of various heavy metals including selenium, zinc, apple pectin, garlic, calcium, ground ivy, etc. Whether they can also decrease these compounds from the brain is mostly (if not entirely) untested.