White Vinegar (Best Option)
1 teaspoon per 1 tablespoon lemon juiceWhite vinegar is a strong acid that reacts with baking soda to produce carbon dioxide, which helps cupcakes rise properly. Its neutral flavor profile ensures it doesn't overpower the cupcake's taste.
When using white vinegar, measure precisely as its acidity is stronger than lemon juice. Avoid using too much to prevent a vinegar aftertaste.
Compared to lemon juice, white vinegar maintains the cupcake's light texture and enhances leavening, though it lacks the citrus aroma and subtle flavor complexity.