BCAA’s Alone Won’t Build Muscle

There seems to be some confusion in the sports nutrition industry on whether BCAA’s are good as an intra or post-workout supplement. Many people use them intra-workout to help with recovery as well as reduce soreness post-workout. However, researchers are now saying that BCAA’s have a very limited role in building muscle and that some brands are even wrong with how they are positioning their product. Essentially, BCAA’s alone won’t build muscle.

Best used for recovery and soreness reduction

We have all come to know that amino acids are the building blocks of proteins. But, researchers are now saying that BCAA’s don’t truly play a role in building lean muscle mass. There is very limited data to prove that someone supplementing with BCAA’s can actually increase their lean muscle mass simply by supplementing with additional BCAA’s (says research).

Related Article: Turbocharge Your Protein Shakes with Velositol for More Muscle

A researcher at the University of Arkansas for Medical Sciences mentioned after looking at studies from the 90’s that “The few studies in human subjects have reported decreases, rather than increases, in muscle protein synthesis after intake of BCAA’s.” These were studies where participants were given BCAA’s intravenously (not the conventional use of a powder like what we see and use today). The researchers stated, however, that intravenous or conventional powder form will show the same results when it comes to protein synthesis.

Both of the studies mentioned above failed to increase protein synthesis which aids in new muscle growth and formation. And in fact, interestingly enough, researchers have found it to actually decrease protein synthesis.

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Matt Weik

Matt Weik, BS, CSCS, CPT, CSN, is a globally recognized health, fitness, and supplement industry expert with over 25 years of hands-on experience. He is the founder of Weik Fitness and one of the most prolific writers in the space, known for translating complex science into clear, actionable content. Matt holds a Bachelor of Science in Kinesiology from Penn State University and multiple industry certifications, giving his work both academic credibility and real-world authority. His writing has been featured on thousands of websites and in 100+ magazines worldwide, including FLEX, Muscular Development, Iron Man, and Muscle & Fitness UK, and he has authored 30+ published books. Trusted by leading supplement brands and media outlets alike, Matt is widely regarded as one of the most knowledgeable and reliable voices in health, fitness, and sports nutrition.