< LEADERBOARD/s/proteinSports nutrition

Protein Supplements

Also sold as: Whey protein · Casein protein · Plant protein · Protein powder

Concentrated dairy or plant protein used to fill dietary gaps and support training adaptation. Benefits depend on total intake and training.

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NERD_PROTOCOL // EVIDENCE_MATRIXper goal

Research

EnergyNo established evidence

Energy: Nutritional adequacy and training adaptation do not establish improved alertness or everyday energy; satiety is a different endpoint.

REALITY CHECK // In healthy resistance-training adults, additional protein produces small extra gains: around 0.3 kg lean mass and 2.5 kg in strength outcomes in a major synthesis. Benefits diminish when intake is sufficient; a fitted plateau around 1.6 g/kg/day is population-specific. Acute muscle-protein synthesis, appetite and long-term muscle growth are different endpoints.

Levels: how we grade evidence. Grey = evidence of no benefit; amber = evidence it makes this goal worse.

Ratings are self-reported by a self-selected group of users: how it felt, not proof that it works.

CHECK_YOUR_BOTTLE.EXEruns in your browser · nothing is sent or stored

Check your bottle

Compare what your label says with what was used in trials. This is a trial range, not a personal prescription.

Enter the amount from your label to see the result.

How it was studied

01 // STUDIED_DOSE_RANGE

Study exposure, not a prescription

Acute whey studies often used about 20 g in young men; older-adult protocols sometimes used around 40 g or 0.4 g/kg. Training research concerns total daily protein, with a fitted plateau around 1.6 g/kg/day (upper confidence estimate about 2.2) in healthy adults at maintenance/surplus. Diabetes meal-preloads used around 15-20 g. These are population-specific descriptions, not universal targets.

02 // TIMING_&_MATRIX

Total daily intake dominates narrow workout timing

Essential amino acids provide substrate and stimulate muscle-protein synthesis. Whey digests quickly; casein releases amino acids more slowly. Higher acute synthesis peaks do not prove superior chronic hypertrophy.

03 // EVALUATION_WINDOW

Acute synthesis; weeks/months for adaptation

Acute biochemical responses and chronic clinical outcomes have different evaluation windows; the outcome notes specify the study context.

04 // SAFETY_&_QUALITY_GATE

Material, medicines and tolerability

Milk-protein allergy excludes whey/casein, including ordinary sports hydrolysates: they are not automatically clinical hypoallergenic formulas. Severe lactose intolerance or galactosemia needs product-specific assessment. Advanced kidney or severe liver disease requires specialist planning. Pregnancy, breastfeeding and children warrant nutritional assessment rather than automatic high-dose powder use. Quality testing matters for contaminants.

UPPER LIMIT // No formal EFSA/NIH UL is supplied with verified attribution. Healthy-adult kidney-function evidence cannot be generalized to advanced kidney disease or unlimited exposure. Total intake and health status determine interpretation.

NERD'S NOTENerd Protocols · a clinical and sports dietitian based in the EU

Summary

In healthy resistance-training adults, additional protein produces small extra gains: around 0.3 kg lean mass and 2.5 kg in strength outcomes in a major synthesis. Benefits diminish when intake is sufficient; a fitted plateau around 1.6 g/kg/day is population-specific. Acute muscle-protein synthesis, appetite and long-term muscle growth are different endpoints.

Mechanism

Typical studied dose

Upper limit

No formal EFSA/NIH UL is supplied with verified attribution. Healthy-adult kidney-function evidence cannot be generalized to advanced kidney disease or unlimited exposure. Total intake and health status determine interpretation.

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Forms and label traps

Forms compared
Form on label	Active content	Studied range / day	Absorption & GI tolerance	Verdict
Whey protein concentrate (WPC80) Best for: Lower-cost intake when dairy is tolerated.	80% elemental / active	20000–40000 mg	Rapid digestion; high essential-amino-acid quality. More lactose than isolate; susceptible users may develop gas/diarrhea.	Studied standard [CHECK // MATERIAL_AND_LABEL] Example assumes 80% protein; finished products vary. Match the actual label. PMID 33133540
Whey protein isolate (WPI90) Best for: Low-lactose dairy intake where appropriate.	90% elemental / active	20000–40000 mg	Rapid digestion and high protein quality. Usually low lactose; milk allergens remain.	Good option [CHECK // MATERIAL_AND_LABEL] Example assumes 90% protein. Isolate is not automatically suitable for milk allergy.
Whey protein hydrolysate (WPH90 example) Best for: Specific digestibility preferences.	90% elemental / active	20000–40000 mg	Partially hydrolyzed peptides; faster uptake is not established superior muscle growth. Often low lactose and bitter; allergens can remain.	Good option [CHECK // MATERIAL_AND_LABEL] Example assumes 90%; source products range around 80-90%. Sports hydrolysate is not a prescribed hypoallergenic formula.
Casein (80% example) Best for: Longer meal intervals and satiety preferences.	80% elemental / active	20000–40000 mg	Slower amino-acid appearance. Milk allergens and product-dependent lactose remain.	Good option [CHECK // MATERIAL_AND_LABEL] Example assumes 80% protein. Slow digestion does not establish sleep benefit. PMID 15570142
Pea protein or plant blend (80% example) Best for: Vegan or dairy-free intake.	80% elemental / active	20000–40000 mg	Amino-acid profile differs; pea/rice blends can complement limiting amino acids. Lactose-free; pea may cause gas.	Good option [CHECK // MATERIAL_AND_LABEL] Example assumes 80% protein; soy isolate can approach 90%. Match protein grams and amino-acid quality rather than scoop size. PMID 33133540 PMID 42055214

Common label traps

TRAP_01 // There is a mandatory 30-minute anabolic window
Timing benefits largely disappear after accounting for total daily protein.
TRAP_02 // The body cannot use more than 20 g
A synthesis plateau in a specific acute protocol is not a universal absorption ceiling.
TRAP_03 // Hydrolysate is safe for milk allergy
Ordinary sports hydrolysates may retain allergens and are not clinical hypoallergenic formulas.
TRAP_04 // Plant proteins cannot build muscle
Adequate protein and essential-amino-acid delivery matter; source-specific evidence cannot be generalized to every powder.

Other outcomes studied

Outside the five leaderboard goals. Same evidence levels as above.

LEAN MASS Strong · benefit
About 0.3 kg extra lean mass with resistance training; diminishing benefit once total protein is sufficient.
PMID 28698222 PMID 24724774 PMID 31041966
STRENGTH Strong · benefit
Small additional gains around 2.5 kg; training and initial intake are central.
PMID 28698222
ACUTE SYNTHESIS Moderate · benefit
Around 20 g whey stimulated near-maximal synthesis in specific young-male protocols; this is not chronic hypertrophy.
PMID 24257722 PMID 15570142
BODY COMPOSITION Moderate · benefit
Benefits depend on population, diet and training; whey is not a fat burner.
PMID 29087242 PMID 24724774
LEAN-MASS RETENTION Limited · benefit
Small energy-restriction studies in older/postmenopausal populations suggest support; generalization is limited.
PMID 23231757 PMID 37598750
OLDER-ADULT MUSCLE Strong · benefit
Benefits are most consistent alongside resistance exercise; this does not establish better sleep.
PMID 38350303 PMID 37571361 PMID 34444975
SATIETY Limited · benefit
Small acute appetite/intake changes do not establish sustained weight loss or alertness.
PMID 24801369 PMID 28747330
DIABETES MEAL RESPONSE Moderate · benefit
Small type 2 diabetes RCTs support a meal-related glucose effect, not treatment replacement.
PMID 29635505 PMID 26786576
RECOVERY Limited · benefit
Soreness findings are inconsistent; some trials favor recovery of strength/function.
PMID 36513777 PMID 24435468
CARDIOMETABOLIC MARKERS Limited · benefit
Small heterogeneous changes mainly in metabolic disease do not establish improved survival.
PMID 39647241 PMID 38924998
PLANT VERSUS ANIMAL Moderate · benefit
Soy training and broader synthesis research require attention to dose and amino-acid quality; not every plant source is equivalent.
PMID 29722584 PMID 42055214
ANABOLIC WINDOW Limited · no benefit
No clear independent timing advantage after accounting for daily protein intake.
PMID 24299050

Reader questions

Does a 30 g scoop provide 30 g protein?

At 80% protein it provides 24 g; at 90%, 27 g. Match the selected calculator specification to the actual label.

Is sports hydrolysate safe for milk allergy?

Not automatically. Product-specific allergy advice is needed; it is not interchangeable with a clinical hypoallergenic formula.

Will powder harm healthy kidneys?

A healthy-adult synthesis found no difference in kidney-function changes between higher and lower intakes, but this does not establish safety in kidney disease or unlimited use.

Is casein a sleep supplement?

The source concerns muscle nutrition and digestion speed, not demonstrated sleep improvement.

Stack interactions

Caution Levodopa [CAUTION // CONTEXT_MATTERS]
Protein amino acids compete with transport. Timing or redistribution requires the neurologist rather than independent dietary restriction.
PMID 6694694
Caution Diabetes medicines [CAUTION // CONTEXT_MATTERS]
Whey meal-preload trials show additive glucose-lowering effects. Monitoring belongs with the treating team.
PMID 26786576 PMID 29635505
Caution Creatine [CAUTION // CONTEXT_MATTERS]
Convenience in one shake does not prove special synergy or replace sufficient dietary protein and training.

Red flags: interactions and who should avoid it

Interactions

Large neutral amino acids can compete with levodopa transport; timing changes belong with the neurologist. Whey preloads may add to diabetes treatment, including DPP-4 inhibitors. Food timing matters with levothyroxine, but a protein-specific citation was removed during extraction. Calcium-rich dairy powders may affect susceptible antibiotic absorption; pharmacist advice should follow the actual medicine.

Avoid or ask a doctor first if

Sources (PubMed, 25)

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.
PMID 28698222 · 2018 · Journal Article; Meta-Analysis; Systematic Review
About 0.3 kg extra lean mass with resistance training; diminishing benefit once total protein is sufficient.
Effects of whey protein and resistance exercise on body composition: a meta-analysis of randomized controlled trials.
PMID 24724774 · 2014 · Journal Article; Meta-Analysis; Research Support; Non-U.S. Gov't
About 0.3 kg extra lean mass with resistance training; diminishing benefit once total protein is sufficient.
Effect of whey protein supplementation during resistance training sessions on body mass and muscular strength: a meta-analysis.
PMID 31041966 · 2019 · Journal Article; Meta-Analysis; Systematic Review
About 0.3 kg extra lean mass with resistance training; diminishing benefit once total protein is sufficient.
Myofibrillar muscle protein synthesis rates subsequent to a meal in response to increasing doses of whey protein at rest and after resistance exercise.
PMID 24257722 · 2014 · Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov't
Around 20 g whey stimulated near-maximal synthesis in specific young-male protocols; this is not chronic hypertrophy.
Ingestion of casein and whey proteins result in muscle anabolism after resistance exercise.
PMID 15570142 · 2004 · Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov't; Research Support; U.S. Gov't; P.H.S.
Around 20 g whey stimulated near-maximal synthesis in specific young-male protocols; this is not chronic hypertrophy.
Whey Protein Supplementation Improves Body Composition and Cardiovascular Risk Factors in Overweight and Obese Patients: A Systematic Review and Meta-Analysis.
PMID 29087242 · 2018 · Journal Article; Meta-Analysis; Systematic Review
Benefits depend on population, diet and training; whey is not a fat burner.
Whey protein and essential amino acids promote the reduction of adipose tissue and increased muscle protein synthesis during caloric restriction-induced weight loss in elderly, obese individuals.
PMID 23231757 · 2012 · Journal Article; Randomized Controlled Trial; Research Support; N.I.H.; Extramural
Small energy-restriction studies in older/postmenopausal populations suggest support; generalization is limited.
Dose-Response of Myofibrillar Protein Synthesis To Ingested Whey Protein During Energy Restriction in Overweight Postmenopausal Women: A Randomized, Controlled Trial.
PMID 37598750 · 2023 · Randomized Controlled Trial; Journal Article; Research Support; Non-U.S. Gov't
Small energy-restriction studies in older/postmenopausal populations suggest support; generalization is limited.
Improving sarcopenia in older adults: a systematic review and meta-analysis of randomized controlled trials of whey protein supplementation with or without resistance training.
PMID 38350303 · 2024 · Journal Article; Meta-Analysis; Systematic Review
Benefits are most consistent alongside resistance exercise; this does not establish better sleep.
Effectiveness of Whey Protein Supplementation during Resistance Exercise Training on Skeletal Muscle Mass and Strength in Older People with Sarcopenia: A Systematic Review and Meta-Analysis.
PMID 37571361 · 2023 · Meta-Analysis; Systematic Review; Journal Article
Benefits are most consistent alongside resistance exercise; this does not establish better sleep.
Effects of Milk Protein in Resistance Training-Induced Lean Mass Gains for Older Adults Aged ≥ 60 y: A Systematic Review and Meta-Analysis.
PMID 34444975 · 2021 · Journal Article; Meta-Analysis; Systematic Review
Benefits are most consistent alongside resistance exercise; this does not establish better sleep.
Comparative effects of whey and casein proteins on satiety in overweight and obese individuals: a randomized controlled trial.
PMID 24801369 · 2014 · Comparative Study; Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov't
Small acute appetite/intake changes do not establish sustained weight loss or alertness.
Effects of randomized whey-protein loads on energy intake, appetite, gastric emptying, and plasma gut-hormone concentrations in older men and women.
PMID 28747330 · 2017 · Journal Article; Randomized Controlled Trial
Small acute appetite/intake changes do not establish sustained weight loss or alertness.
A small dose of whey protein co-ingested with mixed-macronutrient breakfast and lunch meals improves postprandial glycemia and suppresses appetite in men with type 2 diabetes: a randomized controlled trial.
PMID 29635505 · 2018 · Journal Article; Randomized Controlled Trial; Research Support; Non-U.S. Gov't
Small type 2 diabetes RCTs support a meal-related glucose effect, not treatment replacement.
A Protein Preload Enhances the Glucose-Lowering Efficacy of Vildagliptin in Type 2 Diabetes.
PMID 26786576 · 2016 · Journal Article; Randomized Controlled Trial
Small type 2 diabetes RCTs support a meal-related glucose effect, not treatment replacement.
The impact of dietary protein supplementation on recovery from resistance exercise-induced muscle damage: A systematic review with meta-analysis.
PMID 36513777 · 2023 · Meta-Analysis; Systematic Review; Journal Article
Soreness findings are inconsistent; some trials favor recovery of strength/function.
Effects of protein supplements on muscle damage, soreness and recovery of muscle function and physical performance: a systematic review.
PMID 24435468 · 2014 · Journal Article; Research Support; U.S. Gov't; Non-P.H.S.; Systematic Review
Soreness findings are inconsistent; some trials favor recovery of strength/function.
The effects of whey protein supplementation on indices of cardiometabolic health: A systematic review and meta-analysis of randomized controlled trials.
PMID 39647241 · 2025 · Systematic Review; Journal Article; Meta-Analysis
Small heterogeneous changes mainly in metabolic disease do not establish improved survival.
Effects of high-quality protein supplementation on cardiovascular risk factors in individuals with metabolic diseases: A systematic review and meta-analysis of randomized controlled trials.
PMID 38924998 · 2024 · Journal Article; Systematic Review; Meta-Analysis
Small heterogeneous changes mainly in metabolic disease do not establish improved survival.
No Difference Between the Effects of Supplementing With Soy Protein Versus Animal Protein on Gains in Muscle Mass and Strength in Response to Resistance Exercise.
PMID 29722584 · 2018 · Journal Article; Meta-Analysis
Soy training and broader synthesis research require attention to dose and amino-acid quality; not every plant source is equivalent.
Effects of Plant- vs Animal-Based Proteins on Muscle Protein Synthesis: A Systematic Review With Meta-Analysis.
PMID 42055214 · 2026 · Journal Article; Systematic Review; Meta-Analysis
Soy training and broader synthesis research require attention to dose and amino-acid quality; not every plant source is equivalent.
The effect of protein timing on muscle strength and hypertrophy: a meta-analysis.
PMID 24299050 · 2013 · Journal Article
No clear independent timing advantage after accounting for daily protein intake.
Changes in Kidney Function Do Not Differ between Healthy Adults Consuming Higher- Compared with Lower- or Normal-Protein Diets: A Systematic Review and Meta-Analysis.
PMID 30383278 · 2018 · Journal Article; Meta-Analysis; Systematic Review
Context on the specific material, mechanism or safety topic named in the indexed title; no independent claim verification was performed for this translation.
Comprehensive overview of the quality of plant- And animal-sourced proteins based on the digestible indispensable amino acid score.
PMID 33133540 · 2020 · Journal Article; not classified as human evidence in source catalog
Context on the specific material, mechanism or safety topic named in the indexed title; no independent claim verification was performed for this translation.
The \"on-off\" phenomenon in Parkinson's disease. Relation to levodopa absorption and transport.
PMID 6694694 · 1984 · Journal Article; Research Support; Non-U.S. Gov't; Research Support; U.S. Gov't; P.H.S.
Context on the specific material, mechanism or safety topic named in the indexed title; no independent claim verification was performed for this translation.

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