Another cultured dairy substitute for buttermilk is yogurt. Yogurt, like buttermilk, has been fermented, in this case by adding "good bacteria," a.k.a. probiotics, to milk. Unlike sour cream ...
It's brimming with active cultures, similar to the good-for-us probiotics found in natural yogurt ... substitute sour cream for buttermilk? Yes, although you'll likely want to thin it out with ...