Yes, you can buy protein powder with food stamps, also known as SNAP (Supplemental Nutrition Assistance Program) benefits, as long as the product is considered a food item and is eligible for purchase with SNAP benefits. This can be checked easily by reading the label on the back of the product. If it includes "Supplement Facts" then you can't purchase it using food stamps. If the label is marked "Nutritional Facts" then you should be able to purchase it with the SNAP benefit on an EBT card.
The SNAP program covers a wide range of food items including dairy products, bread, fruits and vegetables, meat, poultry, and fish, as well as seeds and plants which produce food for human consumption. To determine if protein powder can be purchased with food stamps, you may want to check with your local store or with the SNAP program.