That's what it says on the gallon jug of cider apple vinegar from Braggs.
We try to keep the chickens as healthy as possible in that effort I am giving them their first dose of vinegar. Other chicken farmers have recommended it as a prevention/treatment for worms. We add two gallons to their water tanks in their houses (1% solution).
Agustin is seen here shaking up the vinegar while his water tank fills before taking it out to the chicken houses.