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The Cayenne pepper. is a bit milder, rating at 30,000 to 50,000 Scoville units. They're named after the French Guiana city of Cayenne. I'm sure you're familiar with the Cayenne pepper; it's ground and sold as a pretty common spice.
Cayenne pepper cranks the sauce up to 800 Scoville units of heat compared to Taco Bell's Fire Sauce at 500 Scoville units, which makes this the hottest stuff you can get at the chain. Now, with this secret formula, you can adjust the heat up or down to your preference just by playing with the amount of cayenne you add.