Only the thousands of people that have regained their life.
Coconut oil is also quite effective for many.
The only things that never work are the prescription garbage.
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Namenda and Exelon have improved my 97 yo mother's function to the point that a person casually talking to her might not notice she has any problem at all. We do, of course, but she is considerably improved. The stuff is horribly expensive, however.