Celsius and Monster energy drinks contain harmful levels of cyanide and that the vitamin B12 variant (cyanocobalamin) used in these drinks is derived from hydrogen cyanide sourced from human sewage treatment plants.

Original review summary

The review says it found no supporting evidence that Celsius and Monster contain harmful cyanide levels, and reports that the FDA found no data suggesting hydrogen cyanide is present in energy drinks. It explains that cyanocobalamin contains a small amount of bound cyanide and says the review found no basis for the claim that the drinks’ B12 is made from hydrogen cyanide sourced from human sewage treatment plants.[S1]