Dextrin is a carbohydrate derived from starch, usually from corn, wheat, or potato. It is commonly used in the food industry as a thickener, stabilizer, and bulking agent in many processed foods, including protein powders.
In protein powders, dextrin is often added to improve the texture, taste, and mixability of the product. It can also help to increase the protein content of the powder, although it is not a source of protein itself.
Dextrin is generally considered safe for consumption by most people.