Apparently, according to Ron Rider the "concentrations" are different between the two. As to concentrations of what, I am not sure. But i'm just curious as to which product is on a dusty shelf because I can't imagine the Medaille D'Or to be dusty because it really hasn't been readily available for that long. It is also apparent hard to be able to stock the product. The other one with the blue top they sell at dry cleaners in France and is available everywhere. Also for what it is worth, the Medaille D'Or, when originally sold was in a cylindrical jar and larger than the non-Medaille D'Or version.