Bests & Worsts Reviews from Amazon

When i first started taking Spark 2 years ago I absolutely loved it! It gave me energy and extreme mental focus. I started getting more done then I thought I ever could each day. After awhile I started having mild issues with it like: racing heart rate, jitters, headaches and shaky hands. Like most guys, I thought it would go away, so I continued to use the product. Finally one afternoon I had major issues. My vision would get blurry to the point I couldn't stand, and my legs became so numb I fell over in my living room. I made a doctors appointment, and had blood work done to see if I had something wrong with me. Come to find out, I had toxic levels of taurine and B6 & B12 vitamins. I threw all the Spark I had left away and everything returned to normal, but now it is like I am allergic to any stimulates. I can't even drink a vitamin water without adverse effects. Also to let you know that if you take it for any period of time and quit you go through a withdrawal that is in no way fun!!! It probably took me a month to feel "normal" again after I quite the product. STAY AWAY FROM SPARK!!!