If you are talking about the procedure using microorganisms to convert DHEA to Test, then don't bother.
1. It requires special strains of yeast, not just any old bakers yeast.
2. If you had the correct yeast, you would still not know what yield you recovered. This process is not 100%.
3. Finally, if you somehow did recover a high yield, you would still not be able to make this into an injectable. Syringe filters can remove whole cells, but not cell products and chemicals. Many cell products are toxic or inflammatory.