There are actually credible scientific research studies that have demonstrated that eating more protein makes your muscles grow faster. (fitnessandpower.com)
Regular resistance training and exercise in general is also a stimulus for making your muscles more responsive and capable of building muscle tissue. (cathe.com)
The above statement may bring a thought to your mind that testosterone only helps in making muscles bigger and doesn't play any role in building stronger muscles. (bigwillharris.com)