I learned recently that only 1% of your farts are made up of Hydrogen Sulfide. Ocording to OSHA the odor becomes more offensive at 3-5 ppm. If I could increase it to 500-700 ppm it would cause staggering and even death after 30-60 minutes without immediately getting fresh air. 700-1000 can cause rapid unconsciousness or immediate collapse after 1-2 breaths causing your breathing to stop and death within minutes. 1000-2000 ppm will cause instant death. I've tried sulfur supplements like NAC, MSM and Agmatine Sulfate but they only increase it by a small amount.

Cysteine is a sulfur containing compound. There was a studies done in Australia where they mixed poop with cysteine and found it resulted in a 7-fold increase in hydrogen sulfide emissions.