In a 2007 feasibility study on a method for identifying web pages that make unproven claims, the authors wrote:

An anonymous, unproven claim does little to justify such smugness (enjoy your fine, by the way).

Each one of those unproven claims had to be investigated and removed, one at a time.

Pataskum has an emir but is still without any land area except an unproven claim to the town of Potiskum itself.

McCarthy has made controversial but unproven claims that vaccines lead to autism.

FDA takes seriously its responsibility to protect consumers from products promoted with unproven claims.

Examples of the unproven claims cited in the Warning Letters include:

Because the increased security is an unproven claim.

I don't want to read lies, unsubstantiated and unproven claims and sensationalism.

The scientific community may aim to communicate information about science out of concern for the public's susceptibility to unproven claims.