Ms222 has no effect on people. Ms-222 is an organic sulfur compound, which has the advantages of low concentration, no harm to people and animals, long action time, quick recovery, no residue and no toxic and side effects. Ms-222 is mainly used as an analgesic for fish to prevent fish from twitching during transportation and slaughter. Because of its low concentration and long action time, ms-222 is still in a coma during the transportation and slaughter of fish and will not cause pain to fish.