Personally, I love buttermilk and I find it keeps my stomach settled like yogurt does. I love Greek yogurt too but it is expensive unless I buy it in large amounts and, being single, I find it harder to get it all eaten before it's past its best. Buttermilk, for me, is cheaper and keeps longer. The substitutes I've tried are buttermilk and the vinegar and milk combo. Both are adequate to the task but just not as good as buttermilk itself.

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