Whey Protein Research & Evidence

SupplementScience.ai Editorial Team·Evidence-Based Supplement Research

Published Mar 12, 2026

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Evidence Level

Strong

Whey protein is among the most well-researched supplements in sports nutrition. The landmark 2018 Morton et al. meta-analysis in the British Journal of Sports Medicine, analyzing 49 RCTs with 1,863 participants, confirmed that protein supplementation significantly augments resistance training-induced gains in muscle mass and strength. Tang et al. (2009) demonstrated whey's superiority over casein and soy for acute muscle protein synthesis stimulation. The ISSN Position Stand (2017) recommends 1.4-2.0g/kg/day total protein for physically active individuals, with whey being an effective supplemental source.

Evidence by Condition

Condition	Studied Dose	Evidence
Muscle building	20-40g post-workout + as needed to reach 1.6-2.2g/kg/day	Strong
Recovery	20-25g within 2 hours post-exercise	Strong
Weight management	25-50g per day as meal replacement or snack	Moderate
Sarcopenia prevention	30-40g per serving (older adults need higher leucine threshold)	Moderate
General health	20-25g per serving, 1-2 times daily	Strong

Full Whey Protein Guide

References

Morton RW, Murphy KT, McKellar SR, et al. (2018). 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. British Journal of Sports Medicine. DOI PubMed
Tang JE, Moore DR, Kujbida GW, Tarnopolsky MA, Phillips SM (2009). Ingestion of whey hydrolysate, casein, or soy protein isolate: effects on mixed muscle protein synthesis at rest and following resistance exercise in young men. Journal of Applied Physiology. DOI PubMed
Schoenfeld BJ, Aragon AA, Krieger JW (2013). The effect of protein timing on muscle strength and hypertrophy: a meta-analysis. Journal of the International Society of Sports Nutrition. DOI PubMed
Jäger R, Kerksick CM, Campbell BI, et al. (2017). International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition. DOI PubMed
Devries MC, Phillips SM (2015). Supplemental protein in support of muscle mass and health: advantage whey. Journal of Food Science. DOI PubMed