Is it safe to eat protein bars if I have peanut and soy allergies?

Read the label. Be careful. Read the ingredients. Most likely, there will be a bolded section as the end of the ingredients list saying whether or not the product contains peanut or soy or if it was processed in a plant that uses peanuts or soy in other products.
If no peanut or soy . You need to be sure that the protein bars do not contain peanuts or soy. In the us, all foods sold in this country have to declare if they contain these allergens. You may also have to avoid protein bars that have been packaged or processed in a plant that packages or processes peanuts or soy.