The Narcoberry is one of the berries in ARK: Survival Evolved. It can be found by harvesting flora around the island while spamming the "e" default button to pick up random berries. Then you use them inside the inventory of a unconscious players or dinos to increase their Torpor.
When consumed, Narcoberries increase the Torpor by 7.5 points during 3 seconds. This is especially useful for taming dinosaurs as it can keep them unconscious for longer periods of time. When eaten by a survivor, the Narcoberry restores 4.0 points of Food but also increases Torpor by 7.5.
The Narcoberry can also be used together with Spoiled Meat in the Mortar and Pestle or Chemistry Bench to create Narcotic. Narcotic is often more useful for taming than Narcoberries because it doesn't spoil.