What Is the Difference Between Whey Powder & Soy Powder?

Whey protein powder and soy protein powder are both nutritional supplements that add protein to the diet. The main differences between them stem from the foods used to make them.

Sources

• Whey protein powder is made from whey, the liquid part of milk left over from cheese manufacturing. Soy protein powder is made from soybeans.

Protein Content

• The exact protein content varies by brand. But there is little difference between the protein content of soy protein powder and that of whey protein powder.

Allergens

• Whey protein powder contains milk proteins, which can trigger an allergic reaction in people with a dairy allergy. Soy protein powder can cause an allergic reaction in people with a soy allergy.

Soy Foods

• People seeking to add more soy foods to their diet can use soy protein powder to increase their soy consumption. Those seeking to reduce their soy consumption should avoid it.

Taste

• In 2004, Dr. Tara Alexandra Russell's research found that soy proteins are "characterized by the flavor attributes flour, roasted, cereal." (Ref. 3.) Whey proteins are "characterized by cardboard, brothy and soapy flavors." Both soy and whey protein powders are available with a variety of flavorings that help mask these tastes.