With this extract, I'm using a variety of peppers to make a great flavor combination, in addition to the heat. I won't give it away, but I'll give advice if you want to make your own combos. You need these things, so finding a few that lead in these things is ideal. Smokey, vegetative, heat, sweet. Smokey comes best from some lower heat, or smoked varieties. Vegetative comes best from green, or unripe types. Heat comes best from Capsicum Chinense varieties. Sweet comes best from chocolate, brown varieties, or just any extra ripe pepper. There is one more thing, but it is harder to figure out, and might not be worth the trouble, because it's variations in amount don't change too much. It's acidity, and there are some varieties that are less acidic, but you really need to research it pepper to pepper. I can tell you the Butch T Scorpion Pepper is a bit more on the acidic side.