5% acidity. No. 1 national brand. Estd. 1869. The all natural choice for food. See back. Heinz All Natural Cider Vinegar is Always: Sourced from all natural apples; Ultra-filtered to guarantee sparkling clarity; Diluted to 5% acidity and bottled at peak freshness. Naturally good since 1869! Questions/Comments? Call 1-800-255-5750 or visit us at: www.heinz.com. For more information visit www.HeinzVinegar.com. Mfd. in USA.