Supplements work different on everybody.

Some people they have no effect

Sure, one person can make claim that with out this or that they would never have been this or that.
However, in the grand scheme of things, how can one person judge what a Product does for another person when we really can't measure the contibuting factors

Example: I take Brand X Protien Powder to improve my Muscularity:
In concert with that product, I do the following:
Train harder
Never miss Meals
Reduce Carb Intake
Up my Cario Out put
Take on better Training Partners
Take my Supplements
Prepare All my Meals
Challenge myself every work out
Work toward a Deadline or Contest Date
Clean Up my Diet
Use BBing Drugs*
Remember, lots of people use Drugs and their bodies look like crap and see no results at all 
So you see, it would be very hard to measure what if any contibution a product has regarding the improvements.
However, one thing is for certain, the entire approach to training and nutrition changed as a result of adding Brand X Product.
Therefore end result IMPROVEMENT!

In the end, if the product or brand of product gets the praise for the improvement, everybody is happy! Who's to say otherwise regarding what role or effectiveness of Product Brand X had or didn't have?
You can point to Drugs being the reason a person makes progress and watch from the sidelines or you can find the trigger points (Supplements, Gym Membership, Protien Powder, training Partner or Drugs) and make a move to improve your self image whether it is for competition or the summer beach party! Either way, who cares what someone else is taking or doing, we all have Free Will and wondering about others gets you nowwhere except where your at.

My two cents.
S. Ray