Resistance-trained adults studied 20–40 g per serving after exercise for 8–12 weeks, alongside total protein and training
Reviewed · Published
Whey protein
A rapidly digested dairy protein rich in essential amino acids and leucine.
Established functions
- A rapidly digested dairy protein rich in essential amino acids and leucine.
Dietary sources
- milk
- yogurt
Claims and evidence
Claims that Whey protein alone prevents or treats disease, or invariably improves health without deficiency, are unsupported.
Japanese reference amounts
- Japanese adults (age and sex as specified): Protein goal for adults: 1.0 g/kg body weight/day; no ingredient-specific DRI
Amounts studied
- Resistance-trained adults studied 20–40 g per serving after exercise for 8–12 weeks, alongside total protein and training
Tolerable upper limits
- No specific UL; consider total protein and kidney function
Forms and bioavailability
Supplement forms: whey concentrate WPC, whey isolate WPI, hydrolysate
- WPI contains less lactose; hydrolysate absorbs rapidly but outcome superiority is uncertain.
Safety and interactions
Adverse effects
- bloating
- diarrhea
- milk-allergy reactions
Medicine and nutrient interactions
- levodopa, tetracyclines; calcium content
Contraindications and cautions
- Do not use with milk allergy; seek advice with kidney disease.
Practical selection
- Compare Whey protein amount per serving, form, allergens, and batch testing; prefer a single-ingredient product suited to the intended use.
Sources and review
- Protein intake and exercise position standInternational Society of Sports Nutrition
Daiki Minaki (editorial and evidence review) ·
Frequently asked questions
How is Whey protein different from its broader supplement category?
A rapidly digested dairy protein rich in essential amino acids and leucine. Compare its named form and amount rather than assuming every category product supplies it.
View detailsWhat safety detail matters specifically for Whey protein?
levodopa, tetracyclines; calcium content Do not use with milk allergy; seek advice with kidney disease.
View details