The Forever Compund is an alchemical serum produced by the Brotherhood of the Shield. It is a diluted form of the Elixir of Immortality developed by Isaac Newton in 1652.
While it still retains the life-prolonging properties of its parent elixir, it doesn’t keep any of the other properties. In particular, it does not prevent the mind or body of the person injected with it from decaying.
Newton administered it to Nostradamus in 1652, which kept the seer alive and also kept his prophetic gifts intact until Nostradamus took the Elixir of Immortality three hundred years later.
Originally a powerful, non-addictive mutagen devised by X-Man Hank McCoy (a.k.a. The Beast), Mutant Growth Hormone has since been debased into a less potent but more addictive form, and shown up on the streets of New York City, usually abbreviated to MGH.
MGH is created from the DNA of a mutant (or mutate), and grants the user with limited superpowers for a brief period. Although most sellers of the drug claim that the powers granted are related to the person who the MGH was harvested from, this is in fact untrue, and the powers granted arise from the activation of latent mutant genes in the user.
Known DNA sources for MGH include Hank McCoy (who made the original formulation from his own DNA and took it himself, which may account for both the potency and permanency of the effects), Leland Owlsley (the criminal known as The Owl) and Mattie Franklin (the third Spider-Woman). No verified sample has ever been created from the DNA of Peter Parker (Spider-Man) although dealers frequently claim him as a source of the drug.
An unlikely chemical capable of tapping into that same power that caused the Ten Plagues of Egypt – i.e. the Wrath of God – Sentry Serum was created by a un-named Professor in an attempt to recreate the Super Soldier Serum.
Clearly, he succeeded beyond his wildest dreams. Just as clearly, the addict and thief who took the sole, untested sample of the serum, Robert Reynolds, was manifestly unsuited for the nigh-infinite power it unleashed in him.
It is unclear whether the serum caused his multiple personalities, or merely exacerbated an existing tendency in Reynolds, but in either identity – the ‘heroic’ Sentry or the evil ‘Void’ – he had more power than he could easily control. With his death, it is unlikely that the serum will ever be recreated.
Shocktoxin was created by an unrevealed US military contractor for use by S.H.I.E.L.D., who in turn issued it to members of the Secret Avengers team. Crafted into flechettes with a monofilament edge, Shocktoxin projectiles could slice through almost any armour, and shots that missed left little evidence as the compound dissolved in minutes if left in the open air.
A hit from a Shocktoxin flechette would allow the nerve toxin to do its work – and a single flechette can knock out a healthy bull for about six hours. Human test subjects reported experiencing truly horrifying nightmares while knocked out by the drug. It is not known what the bull experienced.