yup... no difference when i supplemented L-arginine ... about $6 a bottle of 100 caps. 500 mgs in each cap. SO i took about 10 - 20 caps a day.. usually lasted me around 8 - 10 days. and the NO2 lastes 18 days. Go with the L-arginine . I think i used twinlabs l-arginine, or u can get AAKG ( alpha arginine ketoglutarate) supose to be bettr than the L-arginine. but more expensive.
they compare NO2 to steriods... please dont beleive that. lol