I'd save my $$ and not throw it away on the NO2. NO2 did NOTHING for me, just another overhyped supplement to get peoples $$. M1T is good stuff though, u'd get all the pump u need out of the m1t w/o waisting the extra $80 on that no2 crap. As far as it being bad to take both at the same time, should be just fine, but like i said save your $$ and get more m1t if anything.