I used one of the original batches of M1T from MesoLabs back in the day. 10mg was plenty to elicit some pretty bad sides even with liver sups. If I were to run it again, I'd stack it with a test to offset the lethargy. I'm betting newer clones of it are intentionally under dosed. I've run it a 5mg and had good gains.
Be prepared for a long PCT.