What does the evidence actually say?

What we hold on whey, protein and strength

Read as:wheyproteinstrength

4 vetted claims match all three terms. Strongest evidence first.

1. Nutritionwell supported · human data

   In a network meta-analysis of 235 randomised trials covering 20,980 untrained older adults, whey protein plus resistance training ranked as the most effective combination for muscle mass (SMD 1.29) and leg strength (SMD 1.16), while whey plus multicomponent training ranked highest for mobility tasks.

   What it shows: Network meta-analysis of 235 RCTs in untrained older adults, so most rankings rest on indirect comparisons; certainty was moderate for muscle mass and leg strength, effects were moderated by participant condition and protein dose, and findings may not transfer to already-trained people.Meta-analysis · Nutrients

   Full breakdown →Sarcopenia explained →Protein Intake Calculator →

   Source: Explore the Optimal Treatment Regimen Across Combinations of Variate Protein Sources and Exercise Modalities and Its Associated Factors in Older Adults: A Network Meta-Analysis and Meta-Regression of Randomized Controlled Trials. Nutrients 2026
2. Supplementswell supported · human data

   In a meta-analysis of 10 randomised trials with 1,154 participants, whey protein supplementation improved muscle mass and gait speed in older adults diagnosed with sarcopenia, and combining it with resistance training significantly increased handgrip strength.

   What it shows: Meta-analysis of 10 RCTs (1,154 older adults with diagnosed sarcopenia, community and hospital settings mixed); the authors say more studies are needed to validate the results.Meta-analysis · J Nutr Health Aging

   Full breakdown →Whey protein guide →Protein Intake Calculator →

   Source: Improving sarcopenia in older adults: a systematic review and meta-analysis of randomized controlled trials of whey protein supplementation with or without resistance training. J Nutr Health Aging 2024
3. Nutritionpreliminary · human data

   In a meta-analysis of randomised trials in resistance-training adults with a mean age of at least 60 years, 10-15 g of milk protein was sufficient to augment gains in lean body mass, while four out of five studies of whey protein at the same or higher doses showed a negative effect versus control supplementation (-0.49 kg, 95% CI -0.69 to -0.29). Improvements in muscle strength appeared only at protein doses of 22 g or more.

   What it shows: Twenty studies were reviewed and 17 pooled, all in resistance-training older adults with a mean age of at least 60; the striking whey result rests on just five studies, the review is a between-study comparison rather than a head-to-head trial, and the authors note that adequate daily protein intake dilutes any supplement effect.Meta-analysis · Nutrients

   Full breakdown →Whey protein guide →Protein Intake Calculator →

   Source: Effects of Milk Protein in Resistance Training-Induced Lean Mass Gains for Older Adults Aged ≥ 60 y: A Systematic Review and Meta-Analysis. Nutrients 2021
4. Supplementspreliminary · human data

   In an 8-week randomised trial, resistance-trained men taking 30 g/day whey protein plus 10 g/day collagen gained more muscle mass, lumbar spine bone density and strength than whey alone, collagen alone or placebo.

   What it shows: Small double-blind RCT: 40 resistance-trained men across four groups, so about 10 per arm, over only 8 weeks; muscle mass came from bioelectrical impedance rather than a criterion method, and the reported gains, including the spine bone density change, are unusually large and unusually consistent for such a short trial, so independent replication matters.Study · BMC Sports Sci Med Rehabil

   Full breakdown →Whey protein guide →Protein Intake Calculator →

   Source: The combined effects of whey protein and collagen supplementation on bone mineral density and muscle mass in resistance-trained men: a randomized controlled trial. BMC Sports Sci Med Rehabil 2026

Related, not an answer to your question

1. Metabolic & GLP-1well supported · human data

   Pooling 58 randomised trials in adult women, exercise interventions reduced fasting insulin, insulin resistance (HOMA-IR) and fasting glucose compared with control. IGF-1 rose, with no clear effect on IGFBP-3 or the IGF-1:IGFBP-3 ratio, and the evidence was graded strong only for fasting insulin and insulin resistance.

   What it shows: Systematic review and meta-analysis of 58 randomised controlled trials in adult women; no observational or Mendelian randomisation studies qualified, evidence certainty was strong for only two of the outcomes, and effects on C-peptide and HbA1c remain unexamined.Systematic review · Cancer Epidemiol Biomarkers Prev

   Full breakdown →Insulin sensitivity explained →Metabolic Fitness Index →

   Source: Linking Physical Activity to Breast Cancer Risk via Insulin/Insulin-Like Growth Factor Signaling System, Part 1: The Effect of Physical Activity on the Insulin/Insulin-Like Growth Factor Signaling System. Cancer Epidemiol Biomarkers Prev 2022
2. Supplementswell supported · human data

   In a meta-analysis of 12 randomised trials (459 older adults with sarcopenia), adding branched-chain amino acid-rich supplements to resistance training improved only skeletal muscle index (SMD 0.337, p = 0.029). Grip strength, walking speed, chair-stand performance, SPPB score, knee extension strength, total lean mass and fat mass showed no significant advantage.

   What it shows: Meta-analysis of 12 randomised trials with only 459 participants in total, all older adults with sarcopenia; the one positive outcome had a confidence interval reaching close to zero and several functional measures pointed in inconsistent directions, so this cannot be read across to younger or healthy trainees.Meta-analysis · Arch Gerontol Geriatr

   Full breakdown →Sarcopenia explained →Protein Intake Calculator →

   Source: Effects of branched-chain amino acid-rich nutritional supplements combined with resistance training on body composition and body function in older patients with sarcopenia. Arch Gerontol Geriatr 2026
3. Women's Healthwell supported · human data

   A meta-analysis of 14 randomised trials (763 women across reproductive stages) found that adding protein, amino acids or creatine to exercise produced no significant improvement in skeletal muscle mass, appendicular lean mass, fat-free mass, bone mineral content or bone mineral density; only bench press (g = 0.279) and handgrip strength (g = 0.412) improved significantly, with no increase in adverse events.

   What it shows: Pooled from just 14 RCTs totalling 763 women, lumping together whole proteins, amino acids and creatine monohydrate, very different compounds, so heterogeneity is high and the null may hide effects of specific supplements. The authors note that trials were mostly shorter than 12 months and lacked site-specific bone measurements, and no head-to-head comparisons exist.Meta-analysis · Int J Med Sci

   Full breakdown →Creatine monohydrate guide →Protein Intake Calculator →

   Source: Nutritional Supplementation Combined with Exercise for Musculoskeletal Health in Women: A Systematic Review and Meta-Analysis Evaluating Proteins, Amino Acids, and Creatine across Reproductive Stages. Int J Med Sci 2026
4. Trainingwell supported · human data

   A meta-analysis of 18 randomised controlled trials in 539 adults aged 60 and over found resistance training reduced C-reactive protein (effect size -0.72), TNF-α (-0.56) and IL-10 (-3.34), and tended to reduce IL-6 (-0.59). The CRP reduction held across every subgroup, including age, training method, intensity, weekly frequency and programme duration.

   What it shows: Pooled data from 18 RCTs and 539 adults aged 60 and over, using blood markers rather than disease outcomes; protocols were heterogeneous and the anti-inflammatory cytokine IL-10 also fell, which complicates the story.Meta-analysis · Int J Environ Res Public Health

   Full breakdown →Inflammation explained →

   Source: Effects of Resistance Training on C-Reactive Protein and Inflammatory Cytokines in Elderly Adults: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Int J Environ Res Public Health 2022
5. Nutritionwell supported · human data

   Across 49 randomised trials with 1863 healthy adults, adding protein supplements to resistance training increased fat-free mass by 0.30 kg and one-rep-max strength by 2.49 kg on average. Once total protein intake passed roughly 1.62 g/kg/day, extra protein added nothing further to fat-free mass gains.

   What it shows: Meta-analysis of 49 RCTs in healthy adults training for at least six weeks, so the pooled effects are solid but small in absolute terms; the 1.62 g/kg/day ceiling comes from a break-point analysis of group averages, not an individualised threshold, and the senior author discloses dairy-industry grant support.Meta-analysis · Br J Sports Med

   Full breakdown →Muscle protein synthesis explained →Protein Intake Calculator →

   Source: A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med 2018
6. Nutritionwell supported · human data

   A meta-analysis of 74 randomised trials found that eating more protein adds small extra gains in lean mass and lower-body strength for healthy adults doing resistance training. Lean-mass benefits appeared at 1.2-1.59 g of protein per kg per day in adults 65 and over, and at 1.6 g/kg/day or more in younger adults.

   What it shows: Meta-analysis of 74 RCTs in healthy, non-obese adults; the lean-mass effect was small (SMD 0.22, moderate-level evidence), strength evidence was rated low, and some authors have food-industry ties.Meta-analysis · J Cachexia Sarcopenia Muscle

   Full breakdown →Muscle protein synthesis explained →Protein Intake Calculator →

   Source: Systematic review and meta-analysis of protein intake to support muscle mass and function in healthy adults. J Cachexia Sarcopenia Muscle 2022

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