Evidence Level
Moderate
Beef protein isolate is a relatively newer entrant in the protein supplement market but has emerging clinical validation. Sharp et al. (2015) conducted a randomized controlled trial comparing beef protein isolate to whey protein isolate in resistance-trained men over 8 weeks, finding no significant differences in body composition or strength outcomes. Naclerio & Larumbe-Zabala (2016) reviewed protein supplementation broadly and confirmed that animal-derived protein sources, including beef, effectively support lean mass gains when combined with resistance training. The amino acid profile of beef protein is comparable to whey, with adequate leucine content to stimulate muscle protein synthesis.