Whey Concentrate

Study: A double-blind crossover RCT involving 12 trained men (mean age 24 ± 4 years, 76 ± 8 kg, 14% ± 5% body fat). Participants performed resistance exercise in the evening and consumed either 25 g of WPC (MuscleTech 100% Whey, a blend of whey peptides, isolates, and concentrates) or an energy-matched carbohydrate placebo (CHO) immediately post-exercise and the next morning (~10 h recovery). A third trial with no exercise or supplement served as a rested control. Outcomes included whole-body net protein balance and exercise performance recovery (e.g., countermovement jump [CMJ], maximal voluntary contraction [MVC], and Wingate power) over 10 and 24 hours.

Findings: WPC supplementation significantly enhanced whole-body net protein balance over 10 and 24 hours compared to the placebo and control. It also improved recovery of explosive movements (e.g., CMJ metrics) at 10 and 24 hours, particularly in eccentric phase variables, suggesting WPC aids muscle repair and functional recovery post-exercise. No significant correlations were found between net protein balance and specific performance outcomes.

Study: A randomized, double-blind, placebo-controlled trial with 32 men (17 in the whey protein group, 15 in the placebo group). Participants underwent a 4-week supervised resistance exercise program (60 min/day, 6 days/week) with controlled diets. The whey protein group received whey protein isolate (WPI), but the study context suggests WPC was also considered in broader whey supplementation literature. Outcomes measured muscle mass, peak torque of knee and shoulder extensors/flexors, and total work.

Findings: The whey protein group showed a significant increase in muscle mass (p = 0.033) and greater improvements in peak torque for dominant knee flexors (p = 0.048), dominant shoulder extensors (p = 0.028), non-dominant shoulder extensors (p = 0.015), and total work of dominant knee and shoulder extensors (p = 0.012, 0.013) compared to the placebo group. The results suggest WPC enhances resistance exercise-induced muscle mass and strength gains.

Study: An 8-week double-blind RCT involving middle-aged Korean adults. Participants were randomized to receive fermented WPC or placebo. The intervention included a controlled exercise regimen, with outcomes focused on muscular strength, muscle parameters (e.g., lean mass), and physical performance metrics (e.g., grip strength, endurance).

Findings: Fermented WPC supplementation significantly improved muscular strength, lean muscle mass, and physical performance compared to placebo. The study highlighted WPC’s role in enhancing muscle parameters and functional outcomes in middle-aged adults, likely due to its amino acid profile and bioavailability.

Study: A randomized controlled trial involving overweight/obese adults. Participants received 56 g/day of WPC or a carbohydrate control for 23 weeks as part of a dietary intervention. Outcomes included body mass, fat mass, waist circumference, and cardiovascular risk markers.

Findings: WPC supplementation led to greater reductions in body mass (1.8 kg), fat mass (2.3 kg), and waist circumference (2.4 cm) compared to the carbohydrate control. The study supports WPC’s efficacy in improving body composition during weight loss interventions, potentially due to increased satiety and thermogenesis.

Study: A randomized clinical trial involving subjects with type 2 diabetes. Participants consumed a WPC preload before meals, with outcomes measuring glucose levels, insulin response, and incretin hormone secretion (e.g., GLP-1, GIP).

Findings: WPC preload significantly reduced postprandial glucose incremental area under the curve (iAUC) and increased insulin and incretin hormone iAUCs. The mechanism involves stimulating insulin and incretin secretion, slowing gastric emptying, and suppressing appetite, highlighting WPC’s potential in glycemic control for type 2 diabetes.