I am very surprised that potentially powerful drugs such as these are used for this purpose.
You state these can be bought “without any prescription from a medical practitioner”. Well, whether with a prescription or not, that puts them outside the field of being cosmetics.
I have just made a quick Google of these two materials in a mixture - most of the previously available products are discontinued or reformulated. I doubt there is any chance that rules will be relaxed in EU or USA.