β Lemon Juice (Best Fat-Free Option)
1:1 (1 tablespoon lemon juice per 1 tablespoon white vinegar)Lemon juice contains citric acid, which reacts with baking soda to produce carbon dioxide, helping muffins rise and develop a tender crumb. Its acidity level is close enough to white vinegar to maintain the chemical balance in the batter.
When substituting, use fresh lemon juice for best flavor and acidity consistency. Be mindful that lemon juice can slightly brighten the flavor profile of the muffins, which is usually complementary.
Compared to white vinegar, lemon juice results in muffins with a slightly fruitier aroma and a subtle citrus undertone, but the overall texture and rise remain very similar.