I've been doing 10 mg tren/day (actually 20 mg/EOD) for months now with minimal negative effects on my bloods; that's just me, though. Even at just 70 mg/week it has had a dramatic effect on my physique.
Trestolone is the ONLY other non-methylated AAS that has had similarly impressive effects on my physique at a similarly low dose. The effects are completely different. Unlike tren, it does not harden up or dry out the physique, but I'm tellin' ya...even 10 mg of trest/day provided very impressive increases in muscle fullness, overall size, and strength within a short period of time. 10 mg/day has minimal negative effect on my bloodwork. I have never used ANY other drug which changed my physique so much (from a size and fullness standpoint) at such a low dose.
Low dose tren (10 mg/day) and low dose trest (7-10 mg/day) combined, for a total of 120-140 mg/week, has become my go-to stack for rapid changes with minimal negative side effects. I very much look "on" with that stack. In fact, I look better using that than I do when using normal dosages of testosterone, nandrolone, boldenone, Masteron, etc. I realize not everyone's bloods will change as little as mine did from those two drugs together, but for me it has been a godsend.