Actually, we don't know that this is true. Alzheimer's could be a result of cumulative toxicity or trauma in life. 2-73 could possibly help the brain clear the toxins. Cobalt may only be one of many sources, my pet peeve being pharmaceutical toxicity.
This further underlines the failure of the FDA to properly test our medicines and devices.
This is also why ongoing research will be needed even after 2-73 is approved. Just for the sake of an example, perhaps 3-71 will be better at metal toxicity.