Major Rejuvenation Potion

Major Rejuvenation Potion is a potion that restores 1440-1760 health and 1440-1760 mana.

Source
This potion can be made by an Alchemist with a skill level of 300.

It is also a quest reward from Narain's Scrying Goggles.

Recipe: Major Rejuvenation Potion is a rare drop from bosses in the Molten Core.