As a food additive, potassium sorbate is used as a preservative in concentrations of 0.025–0.100%,which in a 100 g serving yields an intake of 25–100 mg. In the United States, no more than 0.1% is allowed in fruit butters, jellies, preserves, and related products.Up to 0.4% has been studied in low-salt, naturally-fermented pickles, and when combined with calcium chloride, 0.2% made good quality pickles.Potassium sorbate has about 74% of sorbic acid's anti-microbial activity.When calculated as sorbic acid, 0.3% is allowed in cold pack cheese food. The upper pH limit for effectiveness is 6.5.