Nourishing extract is an ingredient in Monster Hunter Wilds that you can use to craft other items and trade with other characters. Just like a whole bunch of other resources in the game, you can get it by fighting and defeating certain monsters. However, you need to know the right monsters to take on if you want to farm this ingredient.

Monster Hunter Wilds' Flying Wyverns are the most common Wyvern type, at least until Capcom adds new monsters and Wilds' expansion. These are typically Apex Predators, the monsters who put up the biggest fights and rarely back down from other monsters if they pick a fight. They're also excellent sources of materials for crafting powerful equipment.