What are the differences between buttermilk and sour milk?

Buttermilk is a probiotic-rich liquid created by churning curd, often intentionally fermented for health benefits. Sour milk, however, is simply milk that has naturally spoiled and developed a sour taste due to bacterial growth, which may not be safe or beneficial.

For more on buttermilk's benefits, check out our full guide:

Curd vs Buttermilk – Which Is Better for Digestion and Gut Health | All-Cures