The “Wine of Egypt” was the branded elixir Cagliostro sold alongside the regeneration regimen. The period biographer W. R. H. Trowbridge records the sales legend in detail: Cagliostro gave “a great lady” a vial of “the precious liquid” with instructions to take two drops when the moon entered its last quarter, and the surrounding anecdote held that the elixir had “rejuvenated thirty years” the maid who drank it by mistake. The claim is classified at a testimonial endpoint, because its support is anecdote and advertising legend rather than any measured outcome, and as refuted: the elixir’s composition was never disclosed, no rejuvenating constituent is known, and one of the imposture charges the case against Cagliostro rests on (as Trowbridge frames it) is that he manufactured his remedies “with the object of defrauding the public by attributing to them fabulous properties which he knew they did not possess”.