Arginine can also improve both acute and chronic coxsackievirus B3 infections of the heart muscle (coxsackievirus B3 myocarditis), likely via its action of raising NO levels. See
this mouse study.
Chronic coxsackievirus B infection of the muscles, stomach and nervous system is frequently found in ME/CFS. So arginine seems to have an antiviral or ameliorating effect in coxsackievirus B muscle infection.
What's more,
this mouse study found that by
inhibiting NO, coxsackievirus B3 titers actually increased, and the infection then caused more severe lesions in the heart muscle.
So in the mouse at least, increased NO definitely seems to be helpful for coxsackievirus B myocardial infections, and decreased NO makes these infections worse.
However, usually when you take antivirals for ME/CFS, it takes many months to have a noticeable effect, so I wouldn't think your very rapid remission from this arginine-based supplement in just 36 hours was due to the antiviral action. I would think it is much more likely to be due to the increased NO levels that can result from arginine-based supplements.
Dave Whitlock: Low NO Levels as the Cause of ME/CFS
Have you come across
Dave Whitlock's low NO theory of ME/CFS? Whitlock proposes that
ME/CFS is caused by low basal levels of NO. He points out that
mitochondrial biogenesis (the creation of new mitochondria in cells) is critically dependent on NO levels.
Whitlock says that if your basal NO level is low, your cells will not be producing enough new mitochondria to replace the old decommissioned mitochondria. There is a fast turnover of mitochondria in cells, and if new mitochondria are not being created at a fast enough rate, this leads to a reduced number of mitochondria in cells.
The average lifespan of a mitochondrion in a cell is not known exactly, but
thought to be around 2 to 4 weeks, although
some studies indicate that mitochondrial lifespan may in fact be extremely brief, as short as a 2 days.
If the lifespan of mitochondria is just a couple of days, that would suggest that remedying low NO levels in ME/CFS patients should produce very fast improvements within a day or two, in terms of increasing the number of mitochondria in your cells — which is exactly what you found with your treatment using the NO-raising "MRI NO2 Black" product.
I like Whitlock's idea, as it would be a very elegant solution if ME/CFS were simply caused by reduced mitochondrial biogenesis due to low basal NO.