Increases your max HP. The total boost limit is +100% when more than one is equipped.
Description
HP Up materia is a 
Complete Materia in Final Fantasy VII Remake and "Episode INTERmission" that increases the user's HP by a percentage: 10% at first level, up to a 50% increase at level 5. HP Up materia stacks up to a +100% HP boost, meaning two max level HP Up materia can be equipped per character. HP Up materia grants great durability.
HP Up is also a materia in the Fort Condor minigame in INTERmission, present on Battalion Board I, Battalion Board II, Battalion Board III, and Grandmaster Board. It increases units' HP by 25% and is the only passive materia in the minigame.
Obtained[]
During Chapter 2, "Fateful Encounters", quest called "Evade Pursuers", after meeting with Aerith, Cloud is attacked by Shinra Electric Power Company forces. The battle begins against security officers. Southeast on the map, a previously inaccessible area will lead to a battle against a few security officers and a guard dog, and Cloud can pick up an HP Up materia 
.
HP Up materia can be purchased for 2,000 gil from Chapter 6 "Light the Way", Sector 4 Plate, onwards.
HP Up in the Train Graveyard.
An HP Up materia can be found in Chapter 11, "Haunted", in Switchyard 2 - Section B, during the quest "Toward the Light". Another HP Up is in the duct 
Cloud and Tifa crawl through to eavesdrop on the Shinra directors' meeting in Chapter 16, "The Belly of the Beast", the "Reconnaissance" quest.
In INTERmission, Yuffie finds an HP up materia in the Sector 7 slums outskirts abandoned factory 
in "Power...Down?" during Chapter 1, "Wutai's Finest". She can later buy them from the Sector 7 Item Shop and from any vending machine as well.
Stats[]
| Level | AP required | Effect |
|---|---|---|
| 1 | 0 | Increases max HP by 10%. |
| 2 | 500 | Increases max HP by 20%. |
| 3 | 1000 | Increases max HP by 30%. |
| 4 | 3500 | Increases max HP by 40%. |
| 5 | 5000 | Increases max HP by 50%. |
Use[]
The HP Up materia provides a percentage boost to a character's HP. Multiple HP Up materia can be equipped at once to boost up to 100% of a character's base HP. The materia can greatly boost a character's durability, meaning it is common to equip multiple on all characters, especially in hard mode.
HP Up can be prioritized on Barret if used in conjunction with his Lifesaver ability. Barret has the highest base HP and Lifesaver allows him to tank damage away from the other party members. This means Barret can absorb most of the damage while still having solid HP himself. As HP Up materia is percentage-based, Barret will also gain the most out of using the materia at lower levels. Barret can also use the Provoke Materia to further draw fire his way.
Below Barret, HP Up should be prioritized on Tifa or Aerith, who have the second-lowest and lowest HP in the game, respectively. Their survivability is based more on their mobility than their ability to sustain damage, as their low HP makes them fragile. Equipping the materia can help mitigate this problem and improve their survivability. Cloud benefits from HP Up materia for much the same reason as Tifa, as he is a melee character who will need to confront enemies upfront to deal damage, putting himself in harm's way. However, Cloud has the second-highest HP, and is less of a priority.
In "Episode INTERmission", Yuffie can deal both physical and magical damage with the normal attack command, and change her elemental affinity on the fly with Elemental Ninjutsu. Therefore, she does not need to carry so many 
Magic Materia, leaving more room for supportive materia in her arsenal, such as HP Up. For the superboss challenges in hard mode, it is useful to have multiple maxed out HP Ups on both Yuffie and Sonon. A good way to quickly level hem up is with Volant Armlet and taking on the easy challenges in the Shinra Combat Simulator repeatedly.