Cytoprethaline

Cytoprethaline is a drug designed for humans in cryo-sleep. Cytoprethaline prevents damage to cell membranes from ice crystal formation. It is usually injected, recommended by a doctor, but usually by a medic or a premeasured self-injector. Cryo-sleep is almost always fatal without the use of cytoprethaline. However, 1 in 5000 people exhibit an allergic reaction to this drug; those that do are disqualified from UNSC service, but can still serve in civilian roles attached to the UNSC. Thomas Lasky is one of the few people to be diagnosed with this allergy, which was to be grounds for his discharge from Corbulo Academy of Military Science; however, the school was attacked by the Covenant before Lasky was shipped out.

List of appearances

 * Halo 4: Forward Unto Dawn