Soy-Dairy Protein Blends May Increase Muscle Mass

If you want to gain mass, vary your proteins.

According to a recent study published by the Journal of Applied Physiology, consumption of a blend of soy and dairy proteins after resistance exercise is advantageous for building muscle mass.

This research which was conducted by the researchers at the University of Texas Medical Branch in collaboration with the DuPont Nutrition and Health. The study shows that using a protein blend of soy, casein, and whey post-workout prolongs the delivery of select amino acids to the muscle for an hour longer in comparison to consuming whey alone.

“This study sheds new light on how unique combinations of proteins, as opposed to single protein sources, are important for muscle recovery following exercise and help extend amino acid availability, further promoting muscle growth,” said Blake B. Rasmussen, chairman of UTMB’s Department of Nutrition and Metabolism and lead researcher of the study.

It also shows an increase in amino acid net balance across the leg muscle during early post-exercise recovery period, thus suggesting prolonged muscle building.

This randomized clinical trial included 16 healthy participants, ages 19 to 30, to determine if consumption of a blend of proteins with different digestion rates would prolong amino acid availability and lead to increases in muscle protein synthesis post-workout.

The protein shakes provided to the participants consisted either of a soy-dairy blend (25% isolated DuPont Danisco SUPRO soy protein, 50% caseinate, 25% whey protein isolate) or a single protein source (whey protein isolate).

Again, it’s worth noting that DuPont Nutrition and Health, which has partnered in this study, distributes and advertises soy protein products including DuPont Danisco SUPRO soy protein which was used in this study.


1. University of Texas Medical Branch at Galveston. “Soy-dairy protein blend increases muscle mass, study shows.” ScienceDaily. ScienceDaily, 25 April 2014.