I won't answer for the main questions but if its circulation, what you want to do is get in lots of cayenne pepper.
The hotter the better.
The best cayenne powder is found at health food stores.
Actually start out with a low heat unit pepper and go hotter as your comfortable with it.
Work up to 90,000 heat unit pepper and some 180,000 if you find it.
This will clean out your entire blood system.
Put it in juice and drink it.
This would have prevented David Letterman and Regis Filbin from needing quadruple and quintuple bypasses.
This is good to do even if you don't have circulation problems. It will ensure that you never have that problem.