Worth a try. Inexpensive as supplements go and effective for many. I've been taking 5grams in the am most days of the week, but have been doing this for years so not a good test case for my Q&D work outs which started a week or so after the book was available. Hard to tell, but I believe creatine at 5 grams a day helped a student of mine complete the Q&D 10 x 102h swings alt with 10 pwr push ups, he was having trouble with the 100 power push ups. After a month he was able to complete properly. He was also getting in better shape, so ??