
The Viking Berserkers were a group of ferocious warriors who fought in a trance-like fury, biting their shields and working themselves into a crazed state before battle. It is speculated that they ingested psychedelic mushrooms to induce this heightened state, with references in sagas and folklore suggesting the consumption of psychoactive mushrooms. However, academics have disputed this theory, stating that the side effects of such mushrooms include drowsiness and vomiting, making them ineffective in battle. Instead, it is suggested that Berserkers used henbane, alcohol, or cannabis to induce their frenzied state.
| Characteristics | Values |
|---|---|
| Viking warriors | Berserkers |
| Warrior state | Heightened senses, reduced fear, reduced pain, increased muscle strength, trance-like fury |
| Substances used to enter the warrior state | Alcohol, henbane, cannabis, fly agaric mushrooms (Amanita muscaria) |
| Viking drug use | Alcohol was deeply ingrained in Viking society and culture |
| There is little evidence of the use of fly agaric mushrooms, which would have made the warriors drowsy and vomit | |
| There is some evidence of the use of cannabis and henbane |
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What You'll Learn

Viking Berserkers and their use of mushrooms
Viking Berserkers were fierce warriors said to have fought in a trance-like fury with an insatiable thirst for bloodshed. The term "berserk" comes from the Old Norse "berserkr", meaning "raging warrior of superhuman strength". The word is a combination of the words for "bear" or "bare" and "shirt" or "coat".
There are several theories about the Viking Berserkers and their use of mushrooms. Some theories posit that magic mushrooms in the form of Amanita muscaria, or fly agaric, were responsible for these "warrior shamans" going berserk. However, academics have dispelled this theory, as the side effects of fly agaric include drowsiness, vomiting, muscle spasms, and numbness in arms and legs. Instead, it is suggested that Berserkers used other psychoactive substances, such as black henbane, alcohol, or cannabis, to induce their heightened state.
There is also evidence to suggest that the Berserkers' use of psychoactive substances was not limited to mushrooms. For example, references in sagas and folklore hint at the consumption of psychoactive mushrooms, but there is no mention of mushrooms in the sagas. Additionally, while some people believe that the Berserkers' behaviour aligns with the effects of mushroom consumption, others argue that this behaviour could be the result of other psychoactive substances or even self-induced hypnotic trances.
While the connection between Viking Berserkers and mushroom use remains speculative, it is clear that the Berserkers were feared and revered for their seemingly superhuman strength and endurance in battle. The possibility of occasional mushroom experimentation among the Vikings cannot be ruled out, but it is unlikely that mushrooms were a primary factor in the Berserkers' infamous battle prowess.
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The Viking Museum's take on the matter
The Viking Museum in Stockholm dismisses the idea that Vikings used magic mushrooms, specifically Amanita muscaria or fly agaric, to induce a battle frenzy. The museum points out that the side effects of these mushrooms include drowsiness, vomiting, muscle spasms, and numbness in the arms and legs, which would render warriors ineffective in combat. Instead, the museum suggests that Berserkers, the legendary fierce warriors of the Viking era, may have used other substances such as henbane, alcohol, or cannabis to induce their frenzied state.
Henbane, or black henbane (Hyoscyamus niger), is a plant in the nightshade family that was important in Viking and Druid rituals and connected to witchcraft. While it is only a theory, some believe that the effects of henbane, which can induce a hypnotic trance and heighten muscle strength, match the descriptions of Berserker behaviour. Additionally, henbane grows abundantly and has been found in archaeological sites associated with Norse settlements, further supporting its potential use by the Vikings.
The Viking Museum's position aligns with the idea that Berserkers entered a self-induced hypnotic trance through ritual processes before battle, such as biting their shields and wearing animal skins. In this dissociative state, they may have experienced reduced awareness of their surroundings and pain, heightened muscle strength, and a loss of conscious control of their actions. However, critical thinking and normal social inhibitions would also be weakened, suggesting that the Berserkers were not completely unconscious or mindless in their frenzied state.
While the Viking Museum does not support the theory of mushroom use by Vikings, it acknowledges the possibility of occasional experimentation with psychoactive substances. References in sagas and folklore hint at the potential consumption of mushrooms like Amanita muscaria for their mind-altering properties. However, evidence for widespread use is elusive, and the museum emphasizes that alcohol was the primary and deeply ingrained psychoactive substance in Viking culture.
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Henbane, alcohol, and cannabis
The idea that Viking Berserkers consumed mind-altering substances before going into battle has been a subject of speculation for centuries. The Old Norse sagas describe berserkers as "raging warriors of superhuman strength", who fought with a "trance-like fury", biting their shields and growling like animals.
Alcohol was also significant in Viking culture, and it is possible that the warriors drank alcoholic beverages containing intoxicating herbs, such as henbane, mugwort, or wormwood.
Cannabis seeds have also been found in Viking Age graves in Scandinavia, although only in female-gendered graves, suggesting they were used by völur (seeresses) rather than berserkers. However, it is possible that cannabis was used as a painkiller, or that it was consumed by some warriors.
While there is some evidence to suggest that Vikings may have consumed these substances, the extent of their usage and the contexts in which they were consumed remain uncertain.
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The existence of Berserkers
Viking Berserkers were fierce warriors said to have fought in a trance-like fury with an insatiable thirst for bloodshed. The word "berserk" comes from the Old Norse "berserkr", meaning "raging warrior of superhuman strength". The term combines the words for "bear" or "bare" and "shirt" or "coat". The Berserkers are described as howling with the gods in their minds, biting their shields, and being as strong as bears or oxen.
One theory suggests that Berserkers ingested psychedelic mushrooms, specifically Amanita muscaria or fly agaric, to induce their heightened state of aggression. This theory is based on the idea that the mushrooms' psychoactive properties could have heightened their senses, dulled their pain, and induced feelings of invincibility. However, academics have disputed this theory, arguing that the side effects of fly agaric, including drowsiness, vomiting, muscle spasms, and numbness, would have made them ineffective warriors.
Another theory suggests that Berserkers ingested black henbane, a plant in the nightshade family that was important for Viking and Druid rituals and connected to witchcraft. While this is still a theory, the effects of black henbane match the descriptions of Berserkers, and the plant grows abundantly in the region. Additionally, a burial site in Denmark from around AD 900 was discovered with a woman who appeared to be a priestess or shaman, and she had black henbane with her.
Other theories suggest that Berserkers may have used other hallucinogenic substances, such as white agaric mushrooms or the fungus Claviceps purpurea, which contains a compound used to synthesize LSD. However, these theories are less widely accepted due to the poisonous nature of white agaric and the lack of mention of mushrooms in the sagas.
While the exact nature of the Berserkers' heightened state remains speculative, it is clear that they were regarded as formidable warriors with a reputation for uncontrollable rage and bloodlust.
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The effects of Amanita muscaria
Amanita muscaria, commonly known as fly agaric or fly amanita, is a type of mushroom that contains the psychoactive compounds muscimol and ibotenic acid. While it is often associated with the Viking Berserkers' ritualistic behaviour, the Viking Museum in Stockholm refutes this claim, stating that the side effects of Amanita muscaria include drowsiness, vomiting, muscle spasms, and numbness in arms and legs, which would have made them ineffective warriors. Instead, it is suggested that the Berserkers used substances like alcohol, henbane, or cannabis.
Amanita muscaria is considered poisonous in Europe and is used as an insecticide. However, it has been consumed by people in parts of Asia and Siberia for its psychoactive effects. It is important to note that Amanita muscaria poisoning, while seldom serious, can still be dangerous, especially for children and those seeking its hallucinogenic effects.
While there is a theory that Viking Berserkers consumed Amanita muscaria mushrooms to induce a battle trance, this idea has been largely dispelled by academics. The effects of Amanita muscaria are more likely to hinder physical abilities and combat performance. Additionally, there is no mention of mushrooms in the sagas, which describe the Berserkers and their behaviour in detail.
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Frequently asked questions
It is speculated that Vikings consumed hallucinogenic mushrooms called Amanita muscaria or fly agaric. However, there is little evidence to support this claim.
People who have consumed these mushrooms describe the experience as similar to the Viking Berserkers' rage. They become aggressive, lose fear, and do not feel pain.
Berserkers were Viking warriors who fought in a trance-like fury with superhuman strength and an insatiable thirst for bloodshed. They wore bearskin coverings and little else.
Alcohol consumption was a deeply ingrained cultural practice in Viking society. There is also evidence of cannabis use in the region, and they may have consumed black henbane, which was important for Viking rituals.

























