The pepper extract in Endorphin Rush is neither pure capsaicin or hab extract. The capsaicin most likley comes from plain old paprika (since many thousands of lbs are grown and processed) or tabasco. It doesn't much matter from which chile it comes from. You aren't buying 'concentrated hab flavor'. Pure Cap (not to be confused with the foul tasting sauce of the same name) technical grade, would be about 16,000,000 Scoville Units. Yes- there are many out there hotter than Endorphin Rush (and better flavored). I make one at least as hot (Backdraft), and two (Vicious Viper for CaJohns.com and UnBEARable for me) that are significantly hotter. Tolerance IS an individual thing. -Jim C Mild to Wild