How much gauf in dxm is deadly?

I would like to try some dxm and I’ve got tablets this time, but I couldn’t find anything w/o gauf, and I would like to know if it is safe with this, and if not, how much becomes deadly? I’ve tried dxm before and had a not very good time, so I’d like to try it once more and have a good time with it and be safe this time I’m only planning on doing about 120 mg dxm but it’s 600 mg gauf per tablet and I’m not doing anything until I’m sure I will be mostly safe.