Nogatch hemlock was a poisonous substance.

In 2372, Q gave Quinn a rare form of Nogatch hemlock so that he could commit suicide. USS Voyager's Doctor stated that the drug was not available in the ship's medical stores, and it being a fatal poison the ship's replicators would not produce it either. (VOY: "Death Wish")

Hemlock is closely is associated with suicide in ancient Greece.
Community content is available under CC-BY-NC unless otherwise noted.