Studies with rats have shown a great increase in muscle mass when the rats were supplemented with melatonin. (fitnessandpower.com)
There is also a significant increase in muscle mass, sometimes up to eight percent of an increase of the original muscle mass. (hgh10.com)
Of the 78 highly trained male and female athletes who consumed just protein, they showed only a slight increase in muscle mass for the 10 day period of time. (anabolicsmall.com)