Injectable testosterone preparations manufactured by big pharma for hormone replacement therapy (the kind you get from your doctor) typically have MUCH HIGHER concentrations of solvent -- they never crash. We've seen some preparations of testosterone dissolved in 100% ethyl oleate! Because HRT involves a MUCH LOWER dose by comparison, the total amount of solvent injected never becomes an issue. (Pfizer Testosterone was never meant to be run at 750mg/week)