i think the zz makes a sulfur dioxide when you sleep, which is very unhealthy to your health. symptoms like coughing , hard of breathing, and fatigue. I don't know but when i started using the zz it makes me feel sick in the morning. what is going on does, zz make sulfur dioxide.
ZO and S with Co2 (SO2)
Sulfur dioxide
Moderators: Julia, Walter, Administrator