A strong inverse correlation has long been known between Alzheimer’s and schizophrenia. And though they noted that schizophrenia patients have an overabundance of serum Nitrous Oxides, Alzheimer’s patients have very little or none. Even then they were careful to point out that correlation does not equal causation.
It’s also noteworthy that Sildenafil (Viagra) and Tadalafil (Cialis) tend to increase the amounts of serum NOs.
Sildenafil (Viagra) and Tadalafil (Cialis) add: Losartan, Lipitor, and Metformin.
Those 4 drugs may just be a miracle combination. Even for healthy people. See the book Outlive.