Atlantis truffles are the sclerotia of Psilocybe atlantis, a psilocybin mushroom first described from a lawn in Georgia, USA, in 2003. In the Netherlands they are sold fresh in smartshops, where they sit in the middle of the range: clearly stronger than Mexicana or Pajaritos, milder than Hollandia or Double Vision. A typical session lasts four to six hours.
This guide collects what is known about them, separates measured facts from shop folklore, and gives the practical information you need before you take them. It is written for adults who have already made up their mind and want to do it carefully.
Key facts
| Fact | Atlantis truffles |
|---|---|
| Species | Psilocybe atlantis (sclerotia, grown underground) |
| Active compound | Psilocybin, converted to psilocin in the body |
| Measured content | 0.6 to 1.7 mg psilocybin per gram of fresh truffle |
| Usual pack | 15 grams, fresh |
| First effects | after 20 to 60 minutes |
| Duration | 4 to 6 hours, strongest in the first 2 |
| Legal status | legal to sell fresh in the Netherlands, illegal in most other countries |
The measured range comes from a laboratory study of commercial truffles. It explains why two packs of the same strain can feel different, and why careful people start low.
Where to start
If you have never taken truffles, read what they are, then safety and preparation, then dosage. If you have experience with milder strains and want to know whether Atlantis is a sensible next step, go to how Atlantis compares. To get a sense of how a session actually unfolds, read effects and timeline and the trip reports.
Fresh Atlantis truffles
Both shops sell Atlantis in 15 gram packs. Avalon also has a 30 gram pack and a 60 gram pack, which make sense for a group or for two sessions spread over a few weeks.
Prices include VAT and update automatically. Fresh truffles are perishable, so buy close to the day you plan to use them. The safety page explains how to store them.