No, sodium metabisulfite is not a leavening agent.
Sodium metabisulfite is primarily used as a preservative and antioxidant in foods. It helps to prevent spoilage and discoloration. Leavening agents, on the other hand, are substances such as baking soda or baking powder that cause dough or batter to rise by producing gas (usually carbon dioxide). Sodium metabisulfite does not perform this function.
