What it is
Casein is a slowly digested milk protein that supplies all essential amino acids and naturally contains milk allergens.
Core function and why it is studied
The core connection is the recognized physiological role described above. Research therefore examines daily protein adequacy, muscle protein synthesis, and satiety, while supplement value still depends on baseline intake or status, the form used, and the outcome being measured.
What the evidence means
The physiological role is well established. Supplement benefit is most predictable when intake or status is inadequate; more is not automatically better.
How to compare products
Compare protein grams, amino-acid profile, source, allergen statement, flavor system, and independent contaminant testing.
