They are pretty much in agreement, but then again, doctors are pretty much anti-anything when it comes to supplements. I now pretty much just use protein, MRP, vitamins, EFAs, experia (good health product)creatine (size on) and i'll have maybe about a 1/3 of a bottle of endorush before training. I used to drink a whole bottle a couple years ago.
This is turning into a conversation more for the supplement board, but I posted a link in another post from another website that mentions studies that say people had experienced side effects from arginine and/or arginine alpha ketogluterate. I was actually taking straight arginine powder for a while because I thought my blood pressure was high and that it might help with that. At the same time though, I was getting heart pain. Cut the arginine out, no more heart pain.