Protein Glossary

Learn the science of protein, muscle, and supplementation. Plain-language explanations of the terms you see in research papers and label claims.

DIAAS

DIAAS (Digestible Indispensable Amino Acid Score) is the modern protein quality measure adopted by the Food and Agricult...

Leucine is one of the three branched-chain amino acids (BCAAs) and the single most important amino acid for triggering m...

Creatine is a compound your body produces from three amino acids — arginine, glycine, and methionine — and stores primar...

The 'anabolic window' refers to a once-popular idea that protein consumed within 30 to 60 minutes after a workout produc...

The Recommended Dietary Allowance for protein in the United States is 0.8 grams per kilogram of body weight per day for ...

The International Society of Sports Nutrition (ISSN) is the leading professional organization focused on the science of ...

Sarcopenia is the age-related loss of muscle mass and strength that begins around age 30 and accelerates after 60. The a...

Whey and casein are the two protein fractions of milk, accounting for roughly 20 and 80 percent of total milk protein, r...