Empagliflozin has been shown to increase hematocrit by about 5% when taking 25mg. May want to keep an eye on yours if you are taking testosterone.
Also, studies were done with sema + metformin vs empagliflozin + metformin. sema + metformin was superior to empagliflozin + metformin. Seems like the norm is sema or empagliflozin + metformin.
I am getting close to the upper range for hematocrit which is why I went with metformin. Once I got over the stomach issues (~2 weeks) metformin has been amazing. QSC also sells bulk metformin and it's really cheap with the added bonus that it has been tested and has come in at 98%. Nice. Also measuring 1g of metformin is much easier and possible with many scales and/or measuring spoons. (haven't done this yet so I don't know what spoon to use). For large quantity of powder like metformin, I would take out 30 days worth and move to a new container then vacuum seal the rest (add a desiccant if you have one - amazon sells them cheap) and pop it in the freezer. Moisture is not your friend when dealing with bulk powders. Damn, I wrote too much.