Taking a lot more testosterone than your body normally makes—without working out—can make your muscles bigger and add about 7 pounds of muscle mass, showing that testosterone alone can build muscle.
Claim Language
Language Strength
definitive
Uses definitive language (causes, prevents, cures)
The claim uses definitive language with verbs like 'increase' and 'demonstrating', which assert direct causation and certainty without hedging. The phrase 'demonstrating a direct anabolic effect' explicitly claims causality and mechanism.
Context Details
Domain
exercise_science
Population
human
Subject
Supraphysiologic doses of testosterone (600 mg/week for 10 weeks)
Action
increase
Target
fat-free mass by 3.2 kg and muscle cross-sectional area in the triceps (424 mm²) and quadriceps (607 mm²)
Intervention Details
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
The effects of supraphysiologic doses of testosterone on muscle size and strength in normal men.
Even without working out, men who got high doses of testosterone gained muscle and lost fat — just like the claim says. The numbers in the study match the claim perfectly.