Bob"s Red Mill Dry Buttermilk Powder is naturally produced from pure sweet cream buttermilk. It is easily rehydrated and may be used in any recipe that calls for buttermilk. In a dry form, buttermilk lasts much longer than it does as a liquid, and it does not require refrigeration. It is also a good source of calcium and contains 5 grams of protein per serving. Bob"s Red Mill is the most unique flour mill in the Northwest. We use century old stone grinding equipment to freshly mill whole grain products. Delight your family with whole grain goodness. All natural.