T400 was popular a few years ago. Some mixes had Propionate, Enanthate, and Cypionate in it. The high alchol levels that are needed to dissolve the test esters cause the pain. Can be diluted with Eq or Deca in the same syringe. Normal ratio .5ml T400/1ml Deca or some cut it with sterile cotton seed oil. I used it long time ago. Not that great from memory.