While I'm all for saving costs, I would be shocked if mixing your own inject-able medicine either weekly (with the chance of making a mistake in dosage or sterility) or too such a high degree of sterility that you can confidentally store several doses is not worth the $200 return flight every two years. Maybe I'm overestimating the risks but it still seems like a small saving for it.

Realistically the cost of semiglutide in generic form means you could fly return every 90 days (personal import restriction for perscription meds) and still save $1000 every 3 months (3x$500 monthly - return flight - generic cost).

So cocaine from the south, ozempic from the north, fetanyl from the west and the meth is homegrown. So USA just need some powder from europe to close the circle.

I guess you get more shelf life, but it's an injectable drug.

You probably have to disolve it in very clean water in a very clean container. Do you have to match the salinity and pH with the proprties of the blood? How much time must you stir it to ensure it's completely disolved? Do you have to add something to increase/reduce viscosity? Some alcohol in case there are a few bacterias or improve solubility? How long does the small homemade batch last in the fridge?

IIUC there is another version in pills, they may have a longer shelf life, or not. But ask a medical doctor before taking a ramdom medicine.