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Ray had a separate newsletter and a radio show on the dangers of NO precursors like dietary nitrates / nitrites and supplements like arginine. It is a bit ironic that quite a few bodybuilders out there pay a lot of money for the so-called NO boosters and in reality get the exact opposite effect...
Choline and acetylcholine are another topic that often pops up online. Cholinergic drugs are still the main "treatment" for Alzheimer, even though all of them are abject failure clinically. Ray has written about the excititoxic properties of acetylcholine, and how estrogen manifests its effects...