Whey Protein Isolate

Gold-standard protein supplement for muscle protein synthesis. Robust evidence for muscle building, recovery, and satiety.

A rough internal score reflecting quantity, quality, and consistency of human evidence. Not a clinical recommendation.

Hundreds of studies confirm superior muscle protein synthesis stimulation versus other protein sources due to high leucine content and rapid absorption. Meta-analyses confirm benefits for lean mass, strength, and post-exercise recovery.

• Maximally stimulates muscle protein synthesis
• Highest leucine content among common proteins
• Supports lean mass gain and strength
• Promotes satiety and weight management

20–40 g per serving, 1–3 servings daily based on total protein needs. 2.4 g leucine per ~25 g serving.

• Bloating and gas in lactose-sensitive individuals
• Acne exacerbation (anecdotal)
• GI discomfort at high single doses

Dairy-derived; avoid in milk protein allergy. Lactose content is minimal in isolate but not zero. Kidney concerns at very high intakes are overstated in healthy individuals.

Isolate is preferred over concentrate for lactose intolerance and lower calorie goals. Plant proteins can be equally effective when leucine-matched.

• Muscle85
• Recovery70
• Weight loss50