What would the benefits of running mast with tren / test be ?

Some hardening if you're low bodyfat. Mast won't do anything if you're not lean to begin with.
 
Very popular combo. Mast is popular with Tren because as a DHT it balances some of the Prog/Estro effects of the Tren.
 
Well if you like the Mr. Clean look, the benefit would be having his hairdo in a short time period. Lol
 
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