Protein and Amino Acid Supplementation in Military Personnel

ABSTRACT: Protein and amino acid supplements are among the most widely used dietary supplements by active-duty military personnel and other physically active young adults, primarily to increase muscle mass, enhance recovery, support physical performance, and meet protein needs during strenuous training and operations. Randomized controlled studies conducted in laboratory settings demonstrate that supplemental protein and amino acids can enhance muscle and whole-body protein-related responses to military-relevant stressors under highly controlled conditions, and military nutrition policies acknowledge their potential benefit when food intake or logistical constraints impede optimal dietary intake. However, evidence from military field studies is mixed, with supplementation often failing to improve protein balance or related physiological and performance outcomes under severe, multifactorial operational stress. These findings suggest that supplementation may be unnecessary in most real-world contexts and that overemphasis on protein could detract from the critical goal of achieving energy balance by consuming enough energy from mixed-macronutrient sources. This brief commentary reviews accessibility and drivers of heavy protein or amino acid supplement use by military personnel, including safety concerns and access to reliable education resources; contrasts laboratory randomized controlled efficacy trials with real‑world effectiveness studies; and offers practical recommendations for supplemental intake during strenuous military operations.