Red spiders' eggs
From Emps-World Wiki
Red spiders' eggs are a Herblore ingredient that can be used in restore potions. Players can use it on an unfinished Harralander potion to make a Restore potion, or on an unfinished Snapdragon potion to make Super restore potions.
Red spiders' eggs can be obtained by killing Poison spiders that are located in the Barbarian dungeon, or by killing Deadly red spiders found in Karamja dungeon. Having membership and enough agility to pass the obstacle in the Barbarian dungeon would enable a fast and easy way to collect this ingredient.