Ah, Gra sshopper...
This is pure bullshido. Food woo at it's finest.
http://rationalwiki.org/wiki/Woo
Woo
Apparently Cayenne is now recommended as an herbal treatment for heart attacks on the just-vague-enough-to-sound-believable premise that it "promotes warm blood circulation".[3] Suffice it to say, this mechanism is poorly established at best, and in sensitive individuals, exposure to capsaicin has been known to cause heart attacks.[4] And while some small positive metabolic changes have been seen in rat models,[5] human use of cayenne pepper for metabolic regulation can have nasty side effects.