Can a hormone make muscles bigger without working out?
The effects of supraphysiologic doses of testosterone on muscle size and strength in normal men.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Testosterone alone increased squat strength by 16 kg and bench press by 9 kg without any training.
Strength gains are usually attributed to neural adaptations from lifting — but here, muscle grew and got stronger purely from hormone exposure, challenging the assumption that training is required for strength increases.
Practical Takeaways
If you're training hard and not seeing results, optimizing natural testosterone (sleep, diet, recovery) may be more impactful than you think.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Testosterone alone increased squat strength by 16 kg and bench press by 9 kg without any training.
Strength gains are usually attributed to neural adaptations from lifting — but here, muscle grew and got stronger purely from hormone exposure, challenging the assumption that training is required for strength increases.
Practical Takeaways
If you're training hard and not seeing results, optimizing natural testosterone (sleep, diet, recovery) may be more impactful than you think.
Publication
Journal
The New England Journal of Medicine
Year
1996
Authors
S. Halender, B. Hasin, T. H. W. S. Torer, N. Ancy, B. Erman, C. A. C. Allegari, B. R. C. Levenger, T. H. J. B. Unnell, R. Ricker, A. I. S. Hirazi, R. I. C. Asaburi
Related Content
Claims (7)
Even if your testosterone, growth hormone, or IGF-1 levels spike right after a workout, you don’t need those spikes to grow muscle — your muscles can still get bigger without them.
Taking much more testosterone than your body naturally makes can make your muscles bigger and stronger—even if you don’t lift weights or do any exercise.
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.
If a guy who already lifts weights takes a high dose of testosterone and keeps training hard for 10 weeks, he’ll gain a lot more muscle and strength than if he just took the hormone or just trained alone.
When healthy men take a high dose of testosterone for 10 weeks, their body shuts down some of its own hormone production—like turning off a faucet—because it thinks it already has enough.