Self raising flour is a low-protein, low-gluten flour with a raising agent mixed in. It is often used as a shortcut in baking by chefs, or by vegans who do not eat eggs, as the extra raising agent in the flour does the eggs' work.
WHEAT Flour (WHEAT Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Raising Agents (Acid Calcium Phosphate, Sodium Hydrogen Carbonate).