White Vinegar (Best Option)
1 teaspoon per 1 tablespoon lemon juiceWhite vinegar is a clear, mild acid that effectively reacts with baking soda to produce carbon dioxide, which helps muffins rise and develop a tender crumb. Its neutral flavor profile makes it ideal for baking applications where lemon juice is called for.
When substituting, measure carefully as vinegar is more acidic; using too much can impart a sharp taste. Mix it well into the wet ingredients to ensure even distribution.
Compared to lemon juice, white vinegar provides similar leavening benefits but lacks the citrus aroma, resulting in muffins that rise well but with a more neutral flavor profile.