Soy protein isolate, potassium type

Soy protein isolate is a highly refined soy product, processed to remove nearly all fat, fiber, and carbohydrate, leaving an almost pure protein powder that's bland and slightly chalky on its own. It's used as an ingredient rather than eaten directly, most often mixed into protein shakes and smoothies, blended into meat-analog products like veggie burgers and sausages, or added to baked goods, bars, and beverages by manufacturers who want to raise the protein content without changing the recipe much. On its own it dissolves poorly in cold liquid and is usually blended into a smoothie or shaken with other flavorings rather than stirred into a plain glass of water.

As a dry powder, it keeps well for a long time in a sealed container in a cool, dry cupboard. At 321 calories and 88.3 g of protein per 100 g (a 28 g ounce serving), it is extremely concentrated, protein at 177% of the Daily Value in that amount, and this potassium-type isolate also carries potassium at 34% of the Daily Value and iron at 81%. With essentially no fiber or sugar, it functions purely as a protein source to stir into a shake or blend into a recipe rather than as a food eaten for its own texture or flavor.