Most professional bakers will tell you that buttermilk is a necessity for any kitchen. It&amprsquo;s acidic and reacts with alkaline baking soda to create carbon dioxide bubbles, which gives baked goods that signature light and fluffy texture. NOW Real Food&amptrade; Buttermilk Powder is superior to the liquid form since it has a long shelf life and doesn&amprsquo;t require refrigeration. Buttermilk is an excellent source of protein and calcium.