Scoville Heat Units (SHU) express pepper pungency in relation to capsaicinoids, but the traditional dilution test depends on what a tasting panel can detect. Treat a sauce's stated number as one clue, then compare its pepper and other ingredients and add a small amount first to find your preferred heat.
Scoville Heat Units can help compare pepper pungency, but they do not tell the whole story of a bottle of hot sauce. Choose for the dish and flavor you want, then adjust the amount to your own preference.
What the Scoville scale measures
Capsaicinoids are compounds that create the hot, burning sensation associated with chile peppers. Capsaicin is the most abundant capsaicinoid in hot peppers. The Scoville scale expresses pungency in Scoville Heat Units (SHU).
The original Scoville test used a diluted pepper extract and a trained taste panel. More dilution was needed before a hotter sample stopped registering. The method depends in part on panel detection; modern lab analysis can measure capsaicinoids more directly.
Use the number as one clue
If a sauce lists an SHU figure, use it as a broad point of comparison, not a promise about your experience. NIST notes that the traditional taste-panel method is subjective and that pepper heat varies with factors such as pepper type and growing conditions. A bottled sauce also includes other ingredients, so its flavor and your serving size matter to the dish.
Read the ingredient list for the pepper and other flavors. Think about whether you want a sauce to finish a few bites, mix into a whole recipe or sit on the table for diners to add themselves. If the label gives no SHU figure, the pepper and a small taste can still help you decide.
Find your preferred amount
When trying a new sauce, mix a little into one bite or a small portion before seasoning the full dish. That makes it easy to adjust the heat without masking the other flavors. Keep the bottle within reach at the table if different diners prefer different amounts.
For more pantry guidance, see our olive oil grades guide and browse the pantry category.
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Common questions
What does SHU mean on a hot sauce label?
Scoville Heat Units express pungency on the Scoville scale. The traditional test diluted an extract until a trained panel could no longer detect its heat.
Does a Scoville number predict exactly how hot a sauce will taste?
No. The original tasting-panel method is subjective, and the pepper, sauce ingredients and amount you use all shape the experience. Treat a stated SHU as a reference point rather than a guarantee.
How do I choose a sauce if I do not know my heat tolerance?
Check the pepper and ingredient list, then start with a small amount mixed into one bite or portion. Add more gradually if you want stronger heat.