Good collection of knowledge on the topic. I just wrote about the topic myself today, and searched similar posts, finding this one.

Here is mine, I think you will find it of interest, revealing a lot of the things that is uncertain and unanswered in this post.

https://steemit.com/health/@deismac/l-arginine-supplementation-part-2-how-the-amino-acid-can-help-and-prevent-alzheimers-and-dementia