That is so dangerous, buying grey market replicas of pharmaceuticals.

Unless you have a research lab built out in your house, you have zero way of knowing what it is that you're actually getting. Whether the dosing matches the claimed dose. Whether there are bacterial growth, or other manufacturing chemical left in by bottom-of-the-barrel chinese manufacturer.

I understand your risk profile may be different than others, but when you can get the real thing officially, I'm not sure why anyone would risk this.