As So2

Sulfur dioxide (SO2) is a gas that occurs naturally in small amounts. It is often produced industrially by burning sulfur or by heating metal sulfides. It is commonly used in a liquid or solid form (as sulfites).

Sulfur dioxide and sulfites are used as preservatives in many foods, especially dried fruits, wines, and processed potatoes. They prevent spoilage by inhibiting the growth of bacteria, yeasts, and molds. They also act as antioxidants, preventing browning and maintaining color.

Sulfur dioxide and sulfites are generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. However, some individuals, particularly those with asthma, may be sensitive to sulfites, experiencing reactions like wheezing or hives. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) and the European Food Safety Authority (EFSA) have evaluated sulfites and established acceptable daily intakes.