Remember, anything you eat pretty much goes straight to your liver. The best testosterone boosters will increase your natural testosterone levels. Creatine is a small organic acid which serves as an energy intermediate, replenishing levels of ATP (your body’s main source of energy) in a cell faster than glucose or fatty acids. It is best known for its ability to increase the rate of muscle growth and improvements in strength during training, but creatine has also been investigated for its interactions with androgens . In young men between 18 and 35, it appears to cause a mild but reliable increase in testosterone concentrations of around 20-25%.