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where did you get this info about restricting bloodflow to the brain? If it's true then I should probably abstain before playing poker.
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"caffeine blues" book
http://www.amazon.com/Caffeine-Blues.../dp/0446673919
review of book in june 2007 section
http://georgegordon.org/Radio_Archives.htm#Archives
here's some links I googled on bloodflow
http://www.iflyamerica.org/caffeine.asp
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High doses of caffeine also restrict blood flow to the brain. The result: less oxygen to fuel those all-important mental tasks that keep us moving safely through the air. Even just two cups of coffee can reduce the blood flow by 15 to 20 percent, according to David Kerr, MD, who has studied the issue for the British military.
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http://www.adastreet.com.au/content/cms/CAFFEINE/2015/
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Caffeine can restrict blood flow to the heart muscle by up to 39% during exercise. This can cause tissue scarring which is a major cause of heart attack.
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http://www.sportsgeezer.com/sportsge..._before_e.html
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The story reports that both groups repeated the test after ingesting 200 milligrams of caffeine -- the amount contained in two cups of coffee. Researchers found that the caffeine did not affect heart blood flow when the participants were inactive, but did so for those who had exercised. Heart blood flow was 22 percent lower in those who exercised in normal air pressure and 39 percent lower in those who exercised in the high-altitude chamber.
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as far as cayenne, it's not really that hot and I'm a white guy. also freshness just buy in packet at mexican store or section of grocery, very probably that is *not* irradiated, unlike a lot of spices in bottles which are imported and irradiated as a matter of course.