Hi , I'm not a big fan of pro hormones and believe they should be taken orally but If you have the powder you can make it into an injectable. Also, I don't know how this will affect its performance. Also I'm assuming you want to make it at a concentration of 100mg/ml.
Here is how I would prepare it:
Make 4 bottles of 50ml each, use 5% USP benzoyl alcohol and 10% USP benzoyl benzoate
So Weight out 5grams into a sterile vial or sterile beaker add 2.5ml Benzoyl alcohol and 5ml Benzoyl benzoate and 40ml oil
Make sure to keep 2-3ml oil to wash out the syringe filter later.
Now make sure everything is dissolved (homogeneous); if not heat mix.
Once mix is homogeneous
Take a nice 10cc syringe with an 18G pin suck up your mix remove the pin and replace it with a syringe filter (Whatman 45um Sterile) now filter it into a sterile vial.
Do this until you have run the whole solution through the filter.
Now wash out the syringe filter with the 2-3ml of oil you saved
Cap and crimp the vial if its not already done.
Stick a pin in the rubber septum of your vial (make sure its not going into the liquid)
This is to vent the pressure.
Pre-Heat oven to 230F place vial in for a good 20-25 min, remove pin and let cool down.
Always where sterile powder-less latex gloves. Make sure everything is sterile.
If in doubt sterilize it (either by heating to 100degC or using 70% IPA).
People who want to convert prohormones are rare, so good luck.