Kryptonite

> Made of low-grade kryptonite. Radioactive mineral from your home planet. It weakens you.
>
> "Hank Henshaw" to Supergirl, Pilot (Supergirl)

**Kryptonite** is a radioactive mineral from the planet Krypton. Following Krypton's destruction, some kryptonite found its way to the planet Earth. The day Krypton died, large quantities of kryptonite also rained down on Krypton's sister planet, Daxam.

## Overview

### Effects on Kryptonians

> Kryptonians are nearly *indestructible* on Earth. How could that blade hurt me?"
> "Unclear. I've never seen anything like it. It's definitely not from this planet. It seems to be emitting a specific radioactivity that's damaging to your cellular structure.
>
> Astra and her associate discuss a Kryptonite knife's capabilities, Stronger Together

 File:Supergirl suffering kryptonite poisoning.png
Kryptonite is normally green, and Kryptonians exposed to the element will become weak within close proximity to it or if pierced by weapons laced with or made from the substance, and prolonged exposure is fatal. Kryptonite is comprised of sodium, lithium and boron, as well as elements not found on Earth. Kryptonite's effects are radioactive in nature and therefore cannot penetrate the element lead. The radiation of the mineral can be harnessed and used independent of the substance itself to harm a Kryptonian; usually appearing in the form of artificial light emitted from certain machinery. It has even been used as anesthesia or a sedative against Kryptonians due to its effects. Kryptonite inside the body causes green glowing veins to protrude from the skin of a Kryptonian and the physical pain it causes becomes unbearable at that point (as seen when Sam Lane injected Astra with liquid kryptonite to torture her for information). Physical signs of being affected by kryptonite are somewhat fever-like; including nausea, weakness, dizziness, vertigo, fatigue, pain and loss (or near loss) of consciousness. Physical contact with kryptonite of higher intensity is enough to cause burning pain. Kara described the kryptonite poisoning as like having "nails in [her] blood".

### Effects on humans

> Did that just *pulsate*?"
> "This is why no one can help me."
> "This from the kryptonite? You said you were fine."
> "I thought I was."
> "I knew it could pierce the Batsuit, but, when you survived Tommy shooting you, I assumed it meant it was only fatal if the shot hit a vital organ."
> "No. Kryptonite kills; *just hella slow*.
>
> Luke Fox (Earth 1) and Ryan Wilder (Earth 1) discuss her kryptonite wound, Do Not Resuscitate

 File:Luke learns the severity of Ryan's kryptonite wound.png
Although simply being around green kryptonite doesn't adversely affect humans the way it does Kryptonians, having it pierce the skin—such as being shot with a chunk of kryptonite in a manner similar to being hit with a regular bullet—can still cause terminal radiation poisoning. Even if the kryptonite is removed from the wound a short time after being shot with the stone, this ultimately leads to slow and painful death in humans.

### Effects on meta-humans

 File:Bizarro-Supergirl reacts to green kryptonite.png
As seen when "Bizarro" (a coma patient who was altered into a "reversed" duplicate of Supergirl by Maxwell Lord) was shot with bullets made of green kryptonite, in spite of her strength being equal to Supergirl's, her powers work in a manner directly opposite to a Kryptonian; being hit by green kryptonite unexpectedly corrupted her; physically and mentally degrading her, and only made her stronger (though Bizarro is meta-human rather than Kryptonian). In the case of Kyle Cushing (who'd been empowered by X-kryptonite by Tal-Rho's experiments to turn the people of Smallville into his own army by using X-kryptonite to place the consciousnesses of deceased Kryptonians inside the bodies of humans; thus making those people like meta-humans to a certain degree), being around green kryptonite impacted him in much the same way it would a Kryptonian (thus, shooting him with kryptonite while the Kryptonian persona in his body was active presumably would've affected him in the same manner as it would a regular Kryptonian). However, how being shot with green kryptonite would affect other meta-humans (such as the Flash), or if it would influence them any differently than it does a normal human, is unknown, while being around it presumably wouldn't affect them any differently than regular humans.

## Type of Kryptonite

### Green Kryptonite

Easily the most abundant and the first discovered, the green variety of Kryptonite sapped Kryptonians of their strength provided by a yellow sun. They initially get flu-like symptoms and would quickly get weaker until death if not removed from the radiation. Humans can be adversely affected by the mineral's radiation as well with sufficient long-term exposure and it can be carcinogenic as a result.

### Blue Kryptonite

**Blue Kryptonite** has the same effect on Bizarros as Green Kryptonite does on normal Kryptonians.

### Red Kryptonite

**Red Kryptonite** effect on Kryptonians is mental, making them act irrationally.

### Gold Kryptonite

**Gold Kryptonite** is a rare form of the mineral would destroy a Kryptonian's ability to process yellow sunlight, thus permanently removing their superpowers. It was not otherwise harmful to Kryptonian life.

### Silver Kryptonite

**Silver Kryptonite** induces hallucinations. After coming into contact with it, Superman believes his cousin to be Zod.

### Black Kryptonite

**Black Kryptonite** cause a Kryptonian's personalities physically split. The only time it was ever used on Clark was in the Season Four episode "Crusade", when he was reprogrammed as Kal-El. Martha Kent placed a chunk of Black Kryptonite (given to her by Dr. Swann's assistant, Bridgette Crosby) on his chest and the two personalities physically split. Clark then used the Black Kryptonite to eliminate Kal-El.

### White Kryptonite

Kills all plant life, regardless of origin.

### Pink Kryptonite

Pink Kryptonite affect Kryptonians' sexuality or gender. Pink Kryptonite effect on sexuality was seen when Linda Danvers takes the original Kara Zor-El's place. Pink Kryptonite effect on gender was seen when Metallo's Kryptonite heart being transmuted into Pink Kryptonite by Firestorm, which flips the physical genders of Kryptonians, having turned Superman into a woman of steel instead.

### Kryptisium-X

**Kryptisium-X** is a Synthetic Kryptonite that instead of being lethal, it restored Kryptonians's powers. Professor Hamilton coined this term to refer to the change that occurred to the Kryptonite that the Cyborg Superman blasted the Eradicator with when it passed through the latter and struck Superman. Instead of being lethal, it restored Superman's powers. Unfortunately, it also apparently clung to him and caused him to absorb solar energy at a rapidly accelerated rate, eventually causing his powers to go out of control and his body to build more mass. Superman was purged of it after battling the Parasite. Not to be confused with X-Kryptonite.

### Magno-Kryptonite

**Magno-Kryptonite** is a variation of Kryptonite that tracks objects from Krypton. It apparently affects people from Krypton as well, and not even the strength of Superman or Bizarro can escape.

### Jewel Kryptonite

**Jewel Kryptonite** possesses the ability to amplify the psychic powers of people in the Phantom Zone. It enabled Clark to make someone do whatever he asked of them, but the process worked only once on each person, he could even affect himself.

### Anti-Kryptonite

**Anti-Kryptonite** does nothing to harm super-powered Kryptonians, but has the same effects of normal Green K on non-superpowered Kryptonians.

### Krypton Steel

**Krypton Steel** was described by Lex Luthor as a "harmless form of Kryptonite" that only Kryptonians, or beings as strong as them, could break. It is, presumably, a refined metal with similar properties to the iron alloy steel. Superman forged a box made of this material to store a weapon they confiscated from the Legion of Doom at some point. The Legion figured out how to trick Superman into opening the box for them.

### Periwinkle Kryptonite

**Periwinkle Kryptonite** makes Kryptonians feel 'giddy' and naturally puts Bizzaros into fits of rage.

### Amber Kryptonite

**Amber Kryptonite** removes the powers Kryptonians and Bizzaros. A Daxamite-Human hybrid clone of Lois Lane had used an unheard-of kryptonite form to transfer Red Son's abilities into herself before killing him.

### Bizarro Kryptonite

#### Bizarro Red Kryptonite

Bizarro Red Kryptonite is a Kryptonite that affects Bizarro Kryptonians the same way Red Kryptonite affects Kryptonians.

#### Bizarro White Kryptonite

In order to stop Bizarro's rampage, Conner's ran green Kryptonite through the same duplication process that created Bizarro from him in the first place. To Conner's surprise, the resulting mineral had the effect of healing Bizarro, curing the instability that threatened to make him violently explode.

### Magic Kryptonite

#### Blood Kryptonite

Blood Krytponite is a Magical type of Kryptonite that the Cult of Kon-El - a religious sect dedicated to resurrecting Superboy, employed "Blood Kryptonite" in a preliminary ritual to resurrect Sue Dibny. While physically resembling Green Kryptonite, the "Blood" variant drains a portion of life force from present attendees, intended to direct this energy towards an effigy of the deceased as part of a Kryptonian resurrection ceremony.

## Known users

* **Lex Luthor:** At some point after Lex started targeting Superman, he learned that kryptonite could be utilized as a weapon against Kryptonians and used it for many schemes, including going so far as to inject himself with Kryptonite in order to keep Superman away from him and ordering Eve Teschmacher to perform the "Metallo Procedure" on Otis Graves thereby reviving him as a Kryptonite-powered cyborg. Kryptonite powered his Lexosuit, which was used in his meeting with Red Daughter and battles with Supergirl. During the Anti-Monitor Crisis, Lex attempted to use a piece of kryptonite against Clark Kent of Earth 167, but because Clark had given up his powers, it had no effect and Clark snatched it out of Lex's hand and threw it into a field.
* **Maxwell Lord:** Max created Red Kryptonite in hopes of stopping Non's army; unfortunately, Kara inadvertently came in contact with it. The Red Kryptonite lowered and gradually destroyed her inhibitions and turned her into a corrupt version of herself.
* **Lena Luthor:** Lena revealed that she was able to create green kryptonite, which she used to contain Samantha Arias and run tests on the latter, to try and get rid of Reign.
* **Kate Kane:** Kate had stolen a small amount of kryptonite from the Bruce Wayne of Earth 99 after he tried to kill Kara Danvers. However, Kara allowed Kate to keep it, hoping Kate wouldn't have to use it.
* **Leviathan:** Rama Khan stole the stash of Kryptonite once held by the D.E.O. and gave special rings to Sela and Tezumak so they could load the rings with the Kryptonite's radiation to kill Supergirl. However, the majority of Leviathan's supply of the substance is stored in their headquarters.
* **Sam Lane:** Realizing that John Henry Irons from another universe was looking for kryptonite, Superman learned that Sam Lane had stockpiled a stash of kryptonite; enough for the world to be in short supply, citing his reason as him wanting to avoid anyone getting their hands on it to use against Superman. At some point, Sam created a smoke-bomb of sorts which released a cloud of experimental synthetic kryptonite gas, designed to weaken Superman from the inside; thus making him more vulnerable. He cited his reason for developing these weapons as that he hopes for the best, but his job requires him to be prepared for the worst; even when it comes to Superman.
* **Morgan Edge & Leslie Larr:** Morgan and Leslie found large quantities of X-kryptonite in a mine the former had recently purchased and subsequently began using it to give humans powers similar to those that a Kryptonian would have under a yellow sun.

### Former users

 File:Kryptonite Sword.png
* **D.E.O.:** Green kryptonite was used by the members of the D.E.O., who utilized it against those that hail from the planet Krypton. They utilize it in the form of restraints and certain weapons, such as blades, darts, and bullets. Prison cells designed for Kryptonians, as well as training rooms, have kryptonite lights that can be lowered to simply de-power a Kryptonian, while higher levels can incapacitate, cripple, and nearly kill them. However, after it was discovered that the D.E.O. had a spy from Project Cadmus who'd stolen the green kryptonite Cadmus used to power Metallo from the D.E.O., J'onn J'onzz gave all of the D.E.O.'s remaining kryptonite to Superman to destroy it.
* **D.E.O. (Earth 1):** This version of the D.E.O. had large quantities of kryptonite; however, it was only stored, not used. It was later stolen by Leviathan.
* **Project Cadmus:** Cadmus created a synthetic version of the Green Kryptonite that had the same effects as natural green kryptonite. It was used to power their green kryptonite-powered cyborg Metallo. However, the synthetic version proved too unstable and eventually exploded. They also used natural green kryptonite, that was used to power their second green Kryptonite-powered cyborg Metallo, however, once the D.E.O. discovered that they had a spy from Cadmus in the organization; J'onn J'onzz gave all of the D.E.O.'s remaining green kryptonite to Clark Kent (Earth 1) (under the guise of Superman) to destroy it; preventing Cadmus from further using green Kryptonite against Clark and Kara.
* **Rhea:** Rhea had Kryptonite weapons forged from the massive amounts of Kryptonite that rained down on Daxam after Krypton was destroyed and ravaged her home world. She later used another form of Kryptonite, Silver, on Superman to make him hallucinate and fight Supergirl, with Superman believing he was battling Zod. Being dead now, most of her Kryptonite has been destroyed. Rhea also had Kryptonite infused in her blood in case she was ever in a fight with Supergirl or Superman, she could easily weaken them and gain an advantage.

> Is that a Kryptonite arrow? Why do you have a Kryptonite arrow?
> In case an evil you ever showed up!
>
> Kara Danvers and Oliver Queen, Crisis on Earth X, Part 2

* **Oliver Queen:** Oliver possessed arrows with tips made out of synthetic Green Kryptonite on the chance that an evil Supergirl would show up. Oliver had the material commissioned based on radio spectrum observations from the remains of Krypton.
* **Barry Allen:** When the reality of Earth 1 was altered by John Deegan using the Book of Destiny, Barry became the Green Arrow and thus had kryptonite arrows just like Oliver. He then used them against A.M.A.Z.O..
* **Bruce Wayne:** On Earth 1, Bruce Wayne had some Kryptonite stored in the Batcave. According to Lucius Fox's journal, the substance is one the few things capable of penetrating the Batsuit. For Batwoman's safety, Luke Fox subsequently destroyed the sample of Kryptonite Bruce had kept.
* **John Henry Irons:** In his first battle with the Superman of Earth 1, Irons used a retractable blade made of Kryptonite to stab Superman, but lost it once it broke off in the latter's wound. Superman then managed to pull it out and threw it away. Despite this, he decided he had to look for more Kryptonite necessary for his mission to kill Superman. After trying to find more in Moldova and Mongolia, Irons abandoned his search.
* **Lois Lane:** Lois used green kryptonite to fight back against Kyle Cushing after he attacked her and Lana.