I saw this comment in a review on amazon for a molybdenum supplement: "It may be a nice supplement for someone else. What got me is that it was ammonium free, but turns out it does not quite work for my purposes of mthfr/cbs symptom correction, while "ammonium" ones do. Gave me painful side effects. I am iffy about the glycine and leucine in it - both could cause you ammonia toxicity if you have certain issues. It could work for people without health problems like mine - my family member likes it.. Giving it three stars for no-fillers/flow agents/ idea.." Does anyone know what they are talking about? For someone with CBS mutations, do they need the amonium version? Does anyone have specific brands that contain ammonium and do not?