Blood Vial - Bloodborne Wiki

Blood Vials are a stackable, consumable item that when used will restore 40% of the hunter’s maximum health. They are the primary method by which inhabitants of Yharnam partake in Blood Ministration.

Special blood used in ministration. Restores HP.

Once a patient has had their blood ministered, a unique but common treatment in Yharnam, successive infusions recall the first, and are all the more invigorating for it.

Acquisition 

Blood Vials can be acquired as a common drop from most overworld and Chalice Dungeon enemies or purchased from the Bath Messengers in the Hunter’s Dream. Their cost to purchase from the Bath Messengers is dependent on the current Moon Phase. 

Usage

The hunter may use a Blood Vial at any time by pressing triangle. A short animation will play of them injecting themselves with the vial, accompanied by a distinct sound.

Price

Game start: 180 Blood Echoes
Upon entering Cathedral Ward: 360 Blood Echoes
Upon inspecting the skull of Lawrence and triggering Nightfall: 540 Blood Echoes
After defeating Rom, the Vacuous Spider, and triggering the Blood Moon: 720 Blood Echoes
In New Game+ and onward: 900 Blood Echoes

Notes 

Developed initially by the Church of Yharnam as a healing remedy, excessive Blood Vial consumption ultimately caused the uncontrollable spread of the Beasthood Plague.