As a rule of thumb, anything that goes into the mouth should be evaluated for gluten content. Many brands of straws made from wheat straw are gluten-free because straw is the stalk left over after the gluten-containing grain is harvested. Some straws sourced from wheat straw have tested at levels below the FDA’s 20 ppm cut-off. Even though the potential for cross-contact exists, it is unlikely, yet it makes sense to be cautious and ask questions!