The testimonial is the oldest format in advertising and the easiest one to make unbelievable. What separates the version that works from the version that does not is almost entirely about specificity.

Specific beats enthusiastic

I love it, it is amazing, it changed my life. These say nothing and the viewer discounts them automatically. It stopped my hands cracking by the third week is a claim somebody can picture, and it is the sentence that does the work.

Include something imperfect

A testimonial with no reservation reads as scripted. Somebody saying the packaging is annoying but the product is worth it is far more persuasive than unbroken praise, and the small criticism buys credibility for everything else in the video.

Do not write the words

Give the creator the point to make and let them phrase it. A testimonial delivered in somebody else's sentences is audible immediately, because people do not speak in written English or written French when they are describing something they liked.

The claim rules still apply

A testimonial is not a way around substantiation. One person's genuine experience does not establish that a product performs a certain way generally, and presenting it as proof of general performance is its own problem regardless of how honest the individual was.

Film it in their space, not a set

The setting is part of the credibility. A testimonial filmed in the kitchen where the product is used, with the ordinary mess of a real house, is worth more than the same words filmed against a clean background.

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Frequently asked questions

What makes a testimonial believable?

Specificity rather than enthusiasm.

Should it include a criticism?

Yes, a small one buys credibility.

Should the brand write the words?

No, give the point and let them phrase it.

Does a testimonial substantiate a claim?

No, it is one person's experience.