Four Thieves Vinegar

Four Thieves vinegar is a herb and garlic vinegar with a story attached: four thieves, in one version from Marseille and in others from Toulouse, plundered plague victims and escaped the disease by drinking a vinegar of herbs, and were let off in exchange for the recipe. The recipe is real and old - aromatic vinegars of this kind appear in European dispensatories and household books - but the story is a legend with several incompatible versions and no contemporary evidence, and it is recorded here as legend. The corpus flags it because the plague narrative is now the main thing sold with the product.

The vinegar is used as a wash for the hands and the body, sprinkled in a room, added to cleaning water, or taken by the spoonful in the older household-medicine use. In folk-magical practice it is a protective and cleansing wash, used on the person and on the thresholds of a house, and it is often paired with salt. In the modern market it is sold as a protection and 'immunity' tonic, which is the part the corpus marks as unsupported.

The legend is the ethical problem: it is told as if it were the recipe's provenance, and it is used to sell a product as though a plague story were a clinical trial. The vinegar is a reasonable household wash and a traditional protective preparation; it is not a prophylactic against infectious disease, and the corpus says so plainly rather than repeating the story as fact. The herbs in it are also not harmless in quantity - wormwood and rue in particular - and the file records the preparation's existence, not a dose.