Zero means no heat, and a regular jalapeño clocks in at around 5,000 units. The habanero, which held the record about 25 years ago, often exceeds 100,000 units. The chemical in peppers that causes ...

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Ranked as the Guinness World Record’s hottest pepper, the Carolina Reaper peaked at about 2.2 million Scoville Heat Units, the scale used to rank how spicy peppers are.