Some products you buy because you know what is inside. And then there is THP420. Since Germany banned HHC in June 2024 and 10-OH-HHC followed in November 2025, shops have been racing to find the next compound that is not on the list yet. THP420 is the current candidate. At large sellers such as Canapuff it now fills whole categories, from vapes to flowers to gummies. The strange part: ask which molecule is behind the name, and there is no public answer.
A name that reveals almost nothing
According to sellers, THP stands for tetrahydropyran. It sounds like chemistry, but says remarkably little. A pyran ring is a building block found in countless compounds, including ordinary THC itself. Calling a substance "tetrahydropyran" is about as precise as calling a car "a vehicle with wheels". Even one retailer that sells THP420 openly describes the name in its own guide as a marketing term rather than a chemical name. The same retailer reports lab analyses in which most of the sample could not be matched to any known cannabinoid.
What is known about the effects
Very little, and that is not a polite phrase. There is no published study on its effects, dosage or how the body breaks it down. What you read online comes almost entirely from shops selling it and describes user reports: relaxing, clearer than HHC, onset within minutes when vaped. That may be true. But it is exactly the kind of claim that was made about HHC and 10-OH-HHC shortly before both were banned.
Is THP420 legal?
The honest answer: nobody can say for sure, because nobody knows the structure. Germany's New Psychoactive Substances Act (NpSG) does not ban individual names but entire groups of substances defined by their chemical structure. Whether a compound falls under it can only be checked if you know how it is built. That is why shops describe THP420 as "currently legal". In essence it only means that nobody has explicitly banned it yet. If a substance is later added to the NpSG, trading and manufacturing it become criminal offences. Buying and possessing it are then prohibited too, though not punished, and the goods can still be confiscated. Rules differ in other EU countries, so check your local law.
Why now?
The story of semi-synthetic cannabinoids follows a remarkably steady rhythm. A compound appears, is marketed as a legal alternative, sells well for a year or two and then lands on the banned list. HHC went through this cycle, so did THCP, and most recently 10-OH-HHC. THP420 has one advantage over its predecessors that is also its biggest problem: as long as nobody knows what it is, it is hard to ban. And just as hard to judge.
Conclusion
THP420 is legal in the sense that it has not been banned so far. Anyone buying it, however, is buying a molecule without a name, without studies and without any guarantee that it will still be allowed a year from now. If you prefer natural cannabis, Highcovery lists cannabis social clubs and shops near you.
