Cayenne Supplements Are Suddenly Everywhere, But Which Ones Are Worth It?

The same species that goes into the capsules. How hot it lands depends entirely on which pepper went into the grinder.

The heat has a scale. Wilbur Scoville worked out how to measure it back in 1912, and cayenne lands somewhere around 30,000 to 50,000 units, hot enough to notice, mild enough to cook with every night of the week.

By kitchen standards, that's a workhorse, not a novelty.

That gap is what started the argument now going around online: the strange distance between the cayenne people cook with, the cayenne herbalists have reached for since the 1800s, and the cayenne sold in a bottle at the pharmacy.

We spent three weeks on it. Reading labels. Calling people inside the supplement business. Even getting a former contract manufacturer on a video call. Here's what we found.

A jar of cayenne isn't one thing. The name covers a family of Capsicum annuum peppers, dried and ground, and the heat swings wildly depending on which pepper went into the grinder and where it was grown.
And it travelled. Mexican cooks ground these peppers long before Columbus's ships, and traders spread them across Africa and Asia inside a single generation.

The catch: none of that history survives the trip into a capsule on its own. Once the pepper is bought in bulk and blended, all you have left is whatever the label claims... if it claims anything.

Pick the peppers ripe and red. Hang them in the sun, or run them through low heat until they rattle. Grind them. The colour deepens, the fruitiness fades back, the burn concentrates into the powder. Cooks in Mexico, Nigeria, India and Louisiana each worked out their own version, and every one of them ends in a jar of red dust that bites.
Botanists call it Capsicum annuum. Cayenne pepper.

People have been using it for a very long time. Not in a lab, in kitchens and apothecary drawers. American herbalists were writing it into their formulas in the 1800s, and it sits in traditional cooking on four continents, long before supplement companies existed.

None of that makes it a miracle. There is no overnight transformation headline to run here. It is a well travelled culinary pepper with a very long record of everyday use, which is a duller story and a truer one.

Most cayenne capsules on the shelf are not the pepper you think you're buying. They use mild filler pepper because it costs less. They never print a heat rating. They skip the black pepper that supports absorption, if they mention absorption at all.

The contract manufacturer put it more bluntly. He'd only talk off the record because supplement brands sue. "Pull ten cayenne bottles off Amazon and ask each one for its heat units and its testing paperwork. Most can't give you either. Half this category is red powder in a capsule with a good looking label, and the buyer has no way to tell which is which."
The pepper is good. The category is bad.

So we did the work. We checked every cayenne product currently sold in America against four basic rules: a real potency figure printed on the label, the actual pepper named rather than a vague heat blend, a price you can work out per serving, and a brand with a track record you can check.

Here's what made it through.

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