yes, proviron is methylated dht.
actually, drostanlonone is methylated dht too.
But the difference is C2 methyl structure of drostanlonone is more stable, So more effective.
Also Primo, stenbolone, M1T, Structurally, they are all methyl dht.
Boldenone is dehydro testosterone.
after dihydro, Dehydro testosterone become dihydro Boldnone(1T), also DHB is weak. and after C1 methyl, dihydro Boldnone become Primo.
so DHB is father, primo, stenbolone, M1T is son.
Why you want to know this much?
I think DHB only makes you more vascular, it also has a weak effect on fast muscle fiber. if you want add size you could choose stenbolone or M1T, not DHB.lol