I put some into a vein before....
You have an uncontrollable coughing fit and feel like you might drop dead.... Which in fact you could... It lasted about a min... Longest min of my life.... It didn't help that the GF didn't know I was juicin, then she heard my coughing fit and thought I was dieing....
It only happened once, and it was because I was careless and forget to pull back and check for blood.....