NSF CONTENTS CERTIFIED: In a crowded marketplace, NaturaNectar Green Bee Propolis stands out for being the FIRST AND ONLY Brazilian Green Propolis to be TESTED and CERTIFIED to the American National Standard for Dietary supplements, NSF/ANSI 173. You can feel confident that what’s on the label is in the product! Our GLUTEN-FREE products don’t contain ethanol, propylene glycol, or harsh chemicals (solvent-free, verified by NSF International).