Last updated: April 2026
THCB is one of the newer cannabinoids that has started appearing on the Swedish market. It is similar to THC but is somewhat milder—and it is legal in Sweden. Here is everything you need to know about THCB, written by us at DR. Herbals, who have been selling and testing THCB products since 2023.
Contents
What is THCB?
THCB — or Tetrahydrocannabutol — is a natural cannabinoid found in cannabis. It is a homolog of THC (delta-9-THC), meaning they have a similar chemical structure but differ in one important aspect: the length of the side chain.
THCB has a side chain of four carbon atoms, while regular THC has five. The extra carbon atom gives THC a slightly higher affinity for the body's cannabinoid receptors—and thus a stronger effect. THCB is therefore milder than THC, but acts in the same way in the body.
When was THCB discovered?
THCB is not a new cannabinoid - The Chemist Roger Adams identified and explored it as early as 1942. But it wasn't until 2019 before a group of Italian researchers managed to isolate THCB in pure form from the cannabis plant. This is why many believe it is newly discovered, even though it has been known in the research world for over 80 years.
The increased interest over the past year is due to more manufacturers extracting and selling THCB products, as the CBD market has matured and consumers are seeking alternatives.
THCB vs. THC — What's the difference?
| Characteristic | THCB | THC (delta-9) |
|---|---|---|
| Sidokedja | 4 atoms | 5 atoms |
| Strength | Milder | Stronger |
| Psychoactive | Yes | Yes |
| Legal in Sweden | Yes (THC-free) | No, it is not. |
| Occurs naturally | Yes | Yes |
| Isolated since | 2019 | 1964 |
Both cannabinoids act on the same receptors in the endocannabinoid system — CB1 and CB2 — but THCB binds slightly weaker, resulting in a generally milder experience.
Does THCB cause a high?
Yes, THCB is psychoactive and can produce a high. The experience is described by many users as milder and more controlled compared to THC or stronger cannabinoids such as THCH and THCJD. THCB can also be combined with other cannabinoids and terpenes which can enhance or dampen the effects.
Effects and duration
What effects are reported?
Research on THCB is still limited, but as a homolog of THC, it is believed to affect the endocannabinoid system in a similar way. Preliminary indications and user reports suggest that THCB may have therapeutic properties, but more research is needed to confirm this.
As a company, we cannot claim that THCB or other cannabinoids can heal or cure diseases. What we can state is that THCB appears to provide a milder and more easily controlled high compared to stronger cannabinoids.
How long do the effects last?
The duration depends on the method of intake, dosage, and individual sensitivity:
| Tagging method | Approximate duration |
|---|---|
| Vape | 1–3 hours |
| Oil / drops | 2–6 hours |
| Gummies / candy | 3–8 hours |
Is THCB legal in Sweden?
Yes, THCB is currently legal in Sweden., as long as the products do not contain THC. THCB itself is not classified as a narcotic in Sweden. However, legislation is under continuous review, and future regulations may change.
What does it look like in the rest of the EU?
In most EU countries, THCB is permitted with a THC content of up to 0.3%. This means that products like THCB buds can be sold legally in these countries. Sweden has stricter requirements — vapes and other products must be THC-free, while hemp flowers (buds) from EU-certified industrial hemp with less than 0.3%THC can be sold within the framework of EU regulations. Always check local laws before taking THCB products abroad.
Does THCB show up on a drug test?
There is a risk THCB tests positive on a standard drug test. Standard drug tests look for molecules that are similar to THC, and THCB is a homolog with an almost identical structure.
If a drug test comes back positive after THCB use, it is recommended to have a blood test. Blood tests can identify exactly which cannabinoid has been used at the molecular level, thus distinguishing THCB from illicit THC.
Is THCB natural or synthetic?
THCB occurs naturally in cannabis, but in very low amounts. This makes extraction costly, and many manufacturers instead choose to convert CBD to THCB in a laboratory — these are called semi-synthetic cannabinoids.
We at DR. Herbals prioritize fully natural cannabinoids. This means that we use natural extracts from organic cannabis, regardless of the higher cost, to ensure the quality and origin of the products.
Side effects
Just like with any substance, moderation is the best option. THCB's side effects are similar to those that can occur with THC use and are not life-threatening, but can be unpleasant with overconsumption:
- Bad breath
- Red eyes
- Increased heart rate
- Paranoid thoughts
- Memory impairments
- Anxiety
- Reduced motor skills
- Start with a low dose
- Avoid if you are unaccustomed
- Do not combine with alcohol
- Choose lab-tested products
- Avoid if you are driving
The intensity of the effects varies greatly between individuals depending on dosage, method of intake, individual sensitivity, and metabolism.
THCB compared to other cannabinoids
There are many cannabinoids on the market today. Here's a quick overview of how THCB compares to the most common ones:
THCB
Mild psychoactive effect. Shorter side chain than THC. Natural cannabinoid. Legal in Sweden.
THCA
Stronger than THCB. Most popular cannabinoid in Sweden right now. Lab-tested buds and vapes.
THCV
Sometimes called "diet THC." Shorter-lasting effects. More stimulating than relaxing.
THCH
Stronger than THC. Long side chain provides high affinity for the receptors. Not for beginners.
CBD
Not psychoactive. Most common in Sweden. Well-studied. No intoxicating effect.
THCB is suitable for those who are looking for a milder and more controlled high than, for example, THCA or THCH, but still want to experience psychoactive effects.
What product types are available with THCB?
There are currently several different forms of THCB available. The best choice depends on personal preference and how quickly the effect kicks in.
Vape
The most common format. A THCB vape provides a quick effect — usually within minutes — and the effect wears off after 1–3 hours. At DR. Herbals, THCB vape is available in Triple Mango, Coconut Cream, and California Haze strains.
Buds (hampablommor)
THCB buds are dried hemp flowers from EU-certified industrial hemp with natural THCB content and under 0.3% THC. They are sold within the framework of EU regulations as a natural hemp preparation — not for consumption.
Gummies and oil
Gummies and THCB oil provide a slower effect that usually takes longer to set in, but lasts longer. The formats suit those who prefer an alternative to vape.
What does research say about THCB?
Research on THCB is still in its early stages. There are no large-scale human clinical trials yet, and authorities like the Medical Products Agency have not approved THCB for medical use.
The Italian research group that succeeded in isolating THCB in pure form in 2019 published observations that THCB interacts with the CB1 and CB2 receptors in the endocannabinoid system – the same receptors as THC. The binding affinity is judged to be lower due to the shorter side chain, but more research is needed to understand the exact mechanisms and any potential properties.
It is important to distinguish between what research observed and what is proven. DR. Herbals makes no medical claims regarding THCB and sells the products exclusively as collectibles — not as dietary supplements or pharmaceuticals.
Frequently Asked Questions about THCB
All information on this page is purely for informational purposes and is not intended to encourage the use of THCB or other cannabinoids as medicine or dietary supplements. Legislation regarding cannabinoids is changing — always check current regulations with the Swedish Medical Products Agency and the Swedish Board of Agriculture. DR. Herbals is not responsible for how the information is used.