i am onlygoing bywhata genttold me at a heath food store he knows his stuff, i was using eca and enquire abot a no2 product he told me do not use anything with l argine in it with eca i may have mis spelled l argine but i would find out about hat has something to dowith your blood pressure , i have no backingon this, just something he mentioned, please dont e stone me, just what i heard may be comlete bullshit bt check it out