How a Strange Accident Saved Me From Baldness" (Photoplay, Nov 1925)
The pattern
This still is filed under If-then promise.
Define
A conditional contract: if you do this, you get that. The sentence can be tested against the reader's own case.
Mechanism
Specificity does the persuading. The if names the action. The then names the outcome. Hedging kills it.
Verdict
We can name both the action and the result without adjectives
Why it works
The headline promises a story with a mystery inside it, an accident that saved him, so the reader must enter the copy to resolve it, and the deck sets a 60-day clock which pre-commits the piece to a before-and-after. The narrator opens by declaring himself the biggest sceptic in the category, which neutralises the reader's distrust by voicing it first and louder. The mechanism is carried by one analogy - you would not rub growing fluid on a tree's leaves, you feed the roots - which makes every rival tonic look absurd in a single image and requires no science to follow. The honesty move near the end, frankly admitting it will not grow hair in every case, buys back credibility spent on the miracle story, and the guarantee makes the reader the sole judge, which removes the arbitration fear that kills guarantees.
Steal this when
You are selling into a category the buyer has already been burned by, where scepticism is the main obstacle. Have the narrator start as the loudest cynic, explain the mechanism with one physical analogy that discredits the whole rival approach, then admit a real limitation before offering the guarantee.