In Each Packet Other Information: Each packet contains: potassium 35 mg; sodium 5 mg. Phenylketonurics: contains phenylalanine, 25 mg per packet. Store at room temperature. Important Information: Phenylketonurics: contains phenylalanine, 25 mg per packet; store at room temperature; keep out of reach of children. Gluten free (may contain trace amounts less than 20 ppm). If you have specific dietary needs, you should consult your doctor before consuming this product. This Metamucil product has a low glycemic index, a measure of the effect of dietary carbohydrates on blood sugar levels. Fiber Singles are pre-measured and ready to mix and enjoy as directed wherever you are – at home, in the office or on the go. It’s a portable way to help you get an extra serving of 100% natural psyllium fiber every day.