You cannot get any meaningful information from one person, non blinded with no control group and no control of other variables not to mention people are just relying on memory to determine if they have had benifit or not. The benifit is just too small to measure like this and just so many variables to totally fuck it up.
This is why studys on things like creatine have hundreds of people, double blinded and placebo controlled. Not to mention then studies are repeated to see if the results are repeatable and not just a one off fluke.