"Clinically tested" is one of the most abused phrases in personal care. On most labels it's close to meaningless, because the phrase has no fixed legal definition. A brand can run a five-person satisfaction survey and print "clinically tested" with a straight face.

If you're going to trust a claim, it's worth knowing what makes one real.

The questions a real claim can answer

• Tested for what? Irritation? Efficacy? Both? "Clinically tested" with no endpoint is decoration.
• How many subjects? Five people is an anecdote. Fifty-plus starts to mean something.
• What protocol? A named, standardized study design is the difference between data and marketing.

What Zaffré actually ran

Zaffré's formulas went through a RIPT study — a Repeat Insult Patch Test, the standard dermatological protocol for evaluating whether a product irritates or sensitizes skin over repeated exposure. The result was 0% irritation across the panel.

That's a specific, named protocol with a measured endpoint. It tells you something a vague label can't: that under repeated use, the formula didn't provoke a reaction in anyone tested.

The broader engineering record sits behind that: 8 years of development, 68 formulations, an 87% repurchase rate, and a return rate under 2%. The clinical study is the controlled measurement; the repurchase and return data are the real-world confirmation.

How to read any label going forward

When a deodorant says "clinically tested," ask what was tested, on how many people, under what protocol. If the brand can answer, the claim is doing work. If it can't, it's a phrase.

SENSITIVE was engineered for exactly the skin that gets burned by everything else — and the RIPT result is why we can say that plainly.