@johnb in the ASEAN market there exists liquid preparations that are used as peeling toners containing HQ and tret. These can be bought without any prescription from a medical practitioner. I was wondering if this is the same case in the US and in EU.
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.
I do know that they are not an approved combination in the US. Hydroquinone at less than 2% is an OTC Drug for Skin Lightening. Tretinoin (a very specific compound different from retinol) is a “legend” drug and requires a prescription.