The Claim
Adding 4.2 grams of leucine to a protein drink containing 10 grams of protein and 24 grams of carbohydrates significantly increases myofibrillar muscle protein synthesis rates over four hours post-resistance exercise in healthy young and older men.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When healthy young and older men consume a drink with 10 grams of protein, 24 grams of carbohydrates, and 4.2 grams of leucine after resistance exercise, their muscle protein synthesis rates increase significantly over the next four hours compared to the same drink without leucine.
See the scientific wording
Adding 4.2 grams of leucine to a protein drink containing 10 grams of protein and 24 grams of carbohydrates significantly increases muscle protein synthesis rates after resistance exercise in healthy young and older men, as measured by myofibrillar protein synthesis over four hours post-exercise.
After exercise, leucine from the drink enters muscle cells and triggers a molecular switch that turns on protein building. This switch activates a chain of signals that tells the cell's protein-making machines to work faster, leading to more muscle proteins being made from amino acids.
What the research says
1 studyAdding 4.2 grams of leucine to a protein drink after a workout helped both young and older men build muscle faster than when they drank the same drink with a different amino acid instead. Leucine acted like a signal to turn on muscle repair.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.