Here is some of the Methylene Blue information I collected for a local client of mine, in case anyone is interested in hearing another perspective.
If you, or someone you care about, if ever considering using it, please get fully-informed before making such a choice. The "positive feeling" is just a side-effect of psychoactive effect as an MAOI (affecting neurotransmitters like an anti-depressant / anti-anxiety drug); it is not a sign of health -- if just "feeling good" was a sign of health, then cocaine addicts must be very healthy. People just perceive more "energy" and "positive" feelings because of the psychoactive effects of the neurotransmitters.
The fact it is a MAOI is very dangerous. There are also other very important health concerns such as changing the oxidation state of heme iron etc.
The following presentations will explain it all in more detail.
View: https://www.youtube.com/watch?v=Tr3wmtbCIDA
View: https://www.youtube.com/watch?v=0Yi_gd2otEg
View: https://www.youtube.com/watch?v=KTS1ETLxsUU
I watched/read a lot more over the past few weeks, because so many people I know are interested, and feel these three video talks summarize all the most important points in a concise and easy-to-understand presentation.
Of course, I respect everyone's freedom to make his or her own health and lifestyle choices, but I just want to make sure those choices are truly informed.
I hope my effort helps someone.