Instruct: Classify Amazon reviews into positive or negative sentiment
Query: BEWARE

I purchased this product without realizing it contained Enterococcus Facalias. This ingredient is outlawed in Australia and is known to cause anti-biotic resistent strains of bacteria. Which is a very serious thing that can even cause death-- that's right death. Or at least a hospital stay. It can also cause other infections as well.I would advise anyone who is considering this product to Google "Is Fivelac Safe?". There are some very alarming side effects of this one ingredient. I am ordering Syntol instead but have yet to try it. I am surprised I read so many glowing reviews of this product and none mentioning this extremely unexpected side effect. Please check into it before ordering Threelac or Fivelac.