Testolent by Sicomed?
It's very good. I've used it in past , and using it now. Half life is approx. 4-5 days, concentration you know 100mg/ml, so you can figure out frequency, depending on your dosage.
It does leave a slightly sore site, if I inject more then 2cc of it, I feel it for a couple days.
But, results are very good.