How to Add Fiber to a Protein Shake

Add psyllium to your protein shake. Psyllium is a soluble fiber, primarily used in over-the-counter laxatives. However, you can find psyllium by itself in dry form or husk form. Both of these forms can be included in your protein shake to ramp up the fiber. Add 1/2 teaspoon of psyllium to your 8-ounce protein shake at the beginning. You can slowly increase the psyllium to 2 teaspoons as your body adjusts to the fiber. Psyllium is flavorless but can become thick if it sits in your protein shake for too long.

Include raspberries in your protein shake. Although all fruit is a good source of fiber, MayoClinic.com states that raspberries contain the highest amount. In a 1-cup serving size, raspberries supply 8 grams of fiber. They are also tasty and will help make your shake sweet.

Use 1 teaspoon of bran powder or cooked bran in your 8-ounce protein shake. You can use any type of bran, depending on your taste. Bran is a good source of fiber, with a 1-cup serving size of cooked oat bran containing 5.7 grams.

Add flaxseeds to your shake to increase protein and fiber. Ground flaxseeds contain 1.9 grams of fiber per tablespoon. Use a coffee grinder to grind the seeds before adding them to your protein shake, to make them easier to digest.

Include peanut butter in your protein shake. Peanut butter not only adds delicious flavor and protein, it also has fiber. Just 2 tablespoons of peanut butter have 1.9 grams of fiber.