Why your homemade buttermilk substitute is ruining your baked goods

Food & Drink · Published 8 October 2026 Swipe more like this →

In short: Many home cooks believe adding vinegar to milk creates a perfect buttermilk replacement. However, this simple trick lacks the essential thickness and complex flavor of the real thing, often resulting in flat, dense cakes and a harsh, stinging acidity that prevents proper browning.

To understand the failure of common substitutes, one must first distinguish between types of buttermilk. While 'O.G. buttermilk' refers to the liquid whey left over from traditional butter production, the product found on North American supermarket shelves is actually 'cultured' or fermented buttermilk. This version is a thick, tangy product created through bacterial fermentation, a process entirely unrelated to the production of butter.

The popular 'Internet Chef' method involves acidifying milk with lemon juice, vinegar, or cream of tartar. While this increases acidity and provides slight thickening, it is fundamentally different from the fermented product. This substitute often produces a harsh, stinging acidity that is more intense than true buttermilk, which can actually inhibit the browning of your baked goods. Furthermore, the lack of substantial thickness means your final products may turn out denser and flatter than intended.

For those needing a replacement, certain methods are far superior to the vinegar trick. Mixing plain yogurt with milk in a ratio of one part yogurt to three parts milk can replicate the necessary acidity and complex flavor, though you may still lose some texture. Even better is using kefir. Because kefir is also a fermented milk product, it shares a similar thickness and acidity with buttermilk. While kefir contains a combination of bacteria and yeast—unlike buttermilk—its complex flavor profile can actually improve the results of buttermilk-based recipes.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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