11-OH-THC in a nutshell: properties and effects

⚠️Legal and health warning

11-OH-THC is not sold as a separate substance – it is the main metabolite of THC, which is produced in the body after consuming products containing THC.

This article is for educational and informational purposes only. It is not a recommendation or instruction for consumption. Any use of this substance is entirely at your own risk.

• What is 11-OH-THC?
• How is 11-OH-THC formed?
• 11-OH-THC vs. THC
• Effects of 11-OH-THC
• Oral use vs. inhalation
• Conclusion

What is 11-OH-THC?

One of the common myths about 11-OH-THC is that it is a substance found in cannabis. In fact, it is not found in cannabis – it is produced by the human body when THC is broken down. More precisely, 11-OH-THC, or 11-hydroxy-THC, is the main metabolite of THC, which is produced after consuming products containing delta-9 THC. 

When you consume a product containing THC, your liver processes it and converts it into 11-OH-THC. However, the amount of 11-OH-THC in the body can vary depending on the individual, the method of cannabis use, metabolism and other factors.

How is 11-OH-THC formed?

Simply put, metabolites are produced when the body breaks down cannabinoids in the liver. When THC is ingested orally, this powerful cannabinoid passes through the digestive system and eventually reaches the liver, where it is broken down into molecules called metabolites.

Cannabinoids themselves are a group of compounds in cannabis that interact with the human body’s endocannabinoid system. This system regulates various physiological processes such as sleep, pain and appetite.

Cannabis contains more than 150 cannabinoids that bind to specific receptors in the body. These are:

• CB1 receptors (located mainly in the brain and central nervous system)
• CB2 receptors (found mainly in the immune system) 

Activation of these receptors causes various physiological effects such as feelings of relaxation and euphoria.

11-OH-THC vs. THC

One of the early studies published in the Journal of Clinical Investigation comparing the effects of THC and 11-OH-THC came to a surprising conclusion. The researchers found that when volunteers were given equivalent one-milligram doses of both compounds intravenously, 11-OH-THC led to a faster onset and more intense psychoactive experience than THC.

According to a 2013 study focusing on the ability to detect 11-OH-THC in urine samples and blood tests, scientists found that the peak concentration of 11-OH-THC in the blood is about an hour and a half after THC use, but depending on the dose, it can persist for eight or more hours.

The fact that its presence in the body can be detected by toxicological tests is particularly important in the context of legislation and driving under the influence of intoxicating substances.

Effects of 11-OH-THC

Several studies are available that describe how 11-OH-THC affects the body. In a study published in The Journal of Clinical Investigation, researchers compared the psychological and physiological effects of intravenously administered THC and 11-OH-THC. Synthetic 11-OH-THC (1 mg i.v.) was administered to nine occasional cannabis users – within 3–5 minutes, they experienced significant tachycardia (rapid heartbeat). With the same dose of THC (1 mg i.v.), the onset was slower – approximately 10–20 minutes.

Further study from 2025 based on simulations suggested that approximately half of the population could achieve tachycardia at resting heart rate with a dose of around 60 mg of THC when taken orally and approximately 15 mg of THC when inhaled.

Tip: 11-OH-THC is the main metabolite of THC, while 10-OH-THC is a secondary. Learn more about it in the article What are the effects and properties of 10-OH-THC and how does it differ from 11-OH-THC?.

Oral use vs. inhalation

According to available data, in regular users, repeated oral use can cause THC to remain measurable in the blood for a longer period of time, while its metabolites (mainly 11-OH-THC and THCCOOH) can accumulate more. This is probably because when ingested, THC first passes through the digestive tract and liver, where part of it is more easily converted to 11-OH-THC.

In contrast, when smoking or vaping, the liver does not have time to convert as much THC into 11-OH-THC because it is absorbed through the lungs directly into the bloodstream, so it quickly enters the circulation and the central nervous system.

This is also evident from a study examining marijuana smoking: THC levels in the blood began to rise rapidly, peaked before the end of smoking, and then began to decline rapidly. In contrast, the average maximum levels of 11-OH-THC were significantly lower than THC levels and appeared immediately after smoking.

Conclusion: the main metabolite of THC

11-OH-THC does not occur naturally in cannabis – it is produced in the liver after THC consumption. Like THC, this metabolite is psychoactive, but research suggests that its effects are stronger and onset more rapid.

Although it is true that oral consumption of cannabis leads to higher production of 11-OH-THC, the metabolite is also produced in smaller amounts by other methods of use (smoking, vaporisation).

Author: Pavla Skřivánková, Update: Lucie Schmidtová

Photo: ChatGPT

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