Black Pepper vs. Cayenne: Piperine, Capsaicin and What Each Does to a Dish

Black pepper and cayenne share a word and nothing else. Black pepper is the dried berry of a climbing vine from India; cayenne is a hot red chile from the Americas. McCormick Science Institute puts it bluntly: red pepper is not at all botanically related to black pepper.¹ Their heat comes from different compounds, piperine in pepper and capsaicinoids in chiles, and they act differently in the pot. In one study of spices boiled with food, black pepper cooked as part of curry powder lost half or more of its piperine, while capsaicin losses were tiny.²

Side by side

For each spice in depth, see the black pepper and cayenne pepper profiles.

Why both are called pepper

Early Spanish explorers found red pepper in the Caribbean while they were out looking for black pepper berries. The name followed the heat, not the botany.

Two different kinds of heat

PepperScale sums up the practical gap: black pepper “provides a mild heat at best,” while cayenne is a medium-hot chile. It also notes that what’s sold as “red pepper,” flakes or powder, is in most cases made with cayenne.⁶

Same receptor, very different strength. Piperine is black pepper’s main pungent alkaloid, and it acts on TRPV1, the same heat-sensing receptor that capsaicin switches on. In a 2005 study on human receptors expressed in cultured cells, piperine was a weaker activator than capsaicin. It needed about 37.9 µM to reach half its maximum effect.⁷ That’s a lab measure, not a taste test, so you can’t turn it into a “how many times hotter” figure for food.

How the heat is measured. Chile heat is usually given in Scoville heat units, originally a dilution test judged by tasters. New Mexico State University calls high-performance liquid chromatography the most accurate method.⁴ We found no published Scoville figure for black pepper, so there’s no like-for-like heat number for the two.

How hot cayenne is depends on who you ask. The figures below describe different things, so don’t average them into one answer.

The cultivar figures belong to those cultivars in those trials. The category range is attributed, not measured. That makes it untraceable, not wrong.

What cooking does to each

At the stove, this is the difference that matters most. In a 1992 Indian study of spices boiled with food for 15 to 30 minutes, 50 to 60% of the piperine was lost when black pepper was cooked as part of curry powder. Losses were lower when pepper was cooked on its own, though the abstract gives no figure for that. Under the same conditions, the abstract puts capsaicin losses “of the order of 0.30%.”² We could only read the abstract, not the full paper.

So when you cook: cayenne added early keeps its heat through a long simmer, while black pepper’s bite fades the longer it’s in the pot. That’s one reason many cooks grind pepper over a dish at the end. We found no sensory study that measures how much of the bite you’d actually taste survives in either case.

Can one stand in for the other?

For heat alone, partly. For flavor, no. Cayenne brings none of pepper’s aroma, and black pepper brings none of cayenne’s color. PepperScale lands in the same place: either can work where a recipe needs only gentle heat, but in most other cases they’re not good substitutes. It describes freshly ground black pepper as having notes of pine and citrus, and says cayenne’s mild fruitiness, most noticeable when fresh, mostly fades once it’s dried and ground.⁶

• Cayenne for black pepper. Ratio (Attributed): Better Homes & Gardens gives ⅛ teaspoon of cayenne in place of ½ teaspoon of black pepper, a quarter of the amount.¹² See black pepper substitutes for other options, including white pepper.
• Black pepper for cayenne. PepperScale warns that black pepper can’t be swapped one for one because it won’t make food as hot.⁶ Cayenne pepper substitutes doesn’t rank black pepper among its options; other chiles do the job better. Ratio (Method): If black pepper is all you’ve got, add it in small steps toward the end of cooking and taste. Its heat fades in a long simmer,² and it won’t match cayenne’s color.

Safety

Microbial contamination. In 2009 and 2010, a Salmonella Montevideo outbreak in the United States was traced to Italian-style meats, and investigators found the outbreak strain in samples of both black and red pepper.¹³

Contaminant limits. The EU sets maximum levels of ochratoxin A and aflatoxins for dried Capsicum products, a category that names chilli powder and cayenne.¹⁴ We didn’t check equivalent limits for black pepper.

What isn’t known

• There’s no published Scoville figure for black pepper, so the two can’t be compared on one heat scale.
• The lab potency difference between piperine and capsaicin doesn’t translate into a tasting ratio.
• We only read the 1992 cooking study as an abstract.

Related

• Black pepper and cayenne pepper profiles
• Black pepper substitutes and cayenne pepper substitutes
• White pepper vs. black pepper, long pepper vs. black pepper and allspice vs. black pepper
• Paprika vs. cayenne and cayenne pepper uses
• Cracked vs. ground black pepper