Are Truffles Regulated or Tested for Quality in the Netherlands?

The legal basis: Warenwet, not Opiumwet

Psilocybin-containing truffles (sclerotia) are not listed on Schedule I or II of the Opiumwet (Dutch Opium Act). That was deliberate. When mushrooms were banned in 2008 via Staatsblad 2008/486, sclerotia fell outside the definition. Parliament confirmed this in 2011-2012 (Kamervragen nr. 1032): as long as no specific legislation exists for sclerotia, the NVWA enforces based on existing food safety law.

That food safety law is the Warenwet (Commodities Act). Truffles are treated as a consumer product you can legally sell. Not as a medicine and not as a prohibited substance. The NPS-wet (New Psychoactive Substances Act), effective July 1, 2025, explicitly excludes psilocybin-containing sclerotia (Eerste Kamer, wetsvoorstel 36159).

But here is where it gets interesting. In April 2026, the Dutch Supreme Court (Hoge Raad, ECLI:NL:HR:2026:450) ruled that truffles are not foodstuffs for VAT purposes. Consumption serves a psychedelic purpose, not a nutritional one. The Warenwet still governs the safety of the product. But the "just a regular food item" framing does not quite hold up. Truffles sit in a category that does not fit neatly into existing boxes.

That is actually exactly what you would expect from a country that takes a pragmatic approach to psychoactive substances.

NVWA: the food safety watchdog that also keeps an eye on truffles

The NVWA (Netherlands Food and Consumer Product Safety Authority) oversees everything sold as a food product. Truffles fall under that umbrella. Smartshops selling truffles must register as food businesses with the NVWA and comply with general food safety requirements.

In practice, that means a HACCP plan (Hazard Analysis and Critical Control Points). It is a system where you, as a business owner, map out the risks in your production process and take control measures. Think hygiene, storage temperature, shelf life. Every baker, butcher, and cheese maker has to do this. And so does every smartshop.

But there is an important caveat. No specific HACCP hygiene code exists for smartshops or truffle sellers. The generic food safety requirements apply, but nobody has written a sector-specific protocol. That difference sounds technical, but it means the rules are broad rather than precise.

The NVWA conducts 75% of its inspections unannounced. The enforcement framework has four escalation levels: compliance assistance, warning, fine, and criminal prosecution. There is no publicly available inspection data specifically for smartshops. I cannot tell you how often a smartshop is actually inspected for truffle quality.

What we do not know is sometimes just as important as what we do know.

Quality control: what actually gets tested?

Here is the gap. There is no mandatory test for psilocybin content before truffles reach the smartshop shelves. The producer must guarantee food safety (no contaminants, proper storage), but the exact amount of active compound? That is not a legal requirement.

And that matters, because the variation is significant. Pellegrini et al. (2013) analysed fresh sclerotia and found psilocybin levels ranging from 59.3 to 167.8 micrograms per 100 mg of fresh material (DOI: 10.1002/dta.1400). That is nearly a threefold difference. Gotvaldova et al. (2022) confirmed similar variation between species and even within the same species (DOI: 10.3390/ijms232214068).

What does that mean in practice? Two boxes of the same brand, bought at the same smartshop, can produce a noticeably different intensity. Not because something is wrong with the product, but because biological variation is simply how fungi work. No producer can fully standardise that.

There are a handful of large producers in the Netherlands. They operate under controlled conditions, but there is no formal quality label or industry certification for truffle producers. No quality seal, no independent audit. Trust is based on track record and market position, not on a sticker.

That is not necessarily bad. But it is good to know as a consumer.

DIMS: the place where you can actually get your truffles tested

If you want to know what is in your truffles, you can go to DIMS (Drug Information and Monitoring System). This is a collaboration between the Trimbos Institute and 33 testing locations across the Netherlands, often connected to addiction care services and municipal health services (GGD).

In 2024, DIMS received 18,893 unique visitors and analysed 18,408 samples (Trimbos Institute, Annual Report DIMS 2024). The analytical techniques are serious: GC-MS (gas chromatography-mass spectrometry) and LC-MS (liquid chromatography-mass spectrometry). Not just a quick test.

DIMS primarily analyses psychoactive substances, mostly substances listed under the Opiumwet such as MDMA, cocaine, and amphetamine, but you can also have mushrooms and truffles tested. They identify the species and any contaminants. What they do not routinely do is measure the exact psilocybin content per batch.

DIMS is primarily a harm reduction system, not a quality control agency. It is designed to inform you so you can make conscious choices. Not to certify producers.

International perspective: how do other countries handle it?

The Netherlands is an exception. In most EU countries, psilocybin is simply prohibited, which makes the question of quality control redundant.

In Belgium, possession of psilocybin-containing products is a criminal offence (Royal Decree of 22/01/1998). In Germany, they fall under the Betaubungsmittelgesetz (BtMG), although a limited exception exists for therapeutic use through "Compassionate Use" programmes. In theory, the EU Novel Food Regulation (2015/2283) could apply to truffles as a "novel food," but in practice no EU country has submitted a Novel Food application for psilocybin sclerotia. It remains a theoretical framework.

European drug policy is monitored by the EMCDDA (now EUDA), but they do not treat psilocybin as a priority. The Netherlands effectively stands alone when it comes to regulating a legal psilocybin product.

And what about the IGJ?

The IGJ (Health and Youth Care Inspectorate) oversees medicines, medical devices, and healthcare. Because truffles are not a registered medicine and may not be sold as one, they fall outside the IGJ's mandate in principle.

If a producer were to claim truffles are a medicine or promise therapeutic effects, the IGJ could intervene under the Geneesmiddelenwet (Medicines Act, Art. 84/85). But that is a line that is rarely crossed by smartshops in practice. Most smartshops are smart enough not to make medical claims.

The IGJ therefore plays a marginal role in the truffle world. Unless someone crosses the line.

What this means for you

If you are considering truffles or already use them, it is good to know this:

Quality depends on the producer, not on an external quality seal. There is no independent body testing every batch before it reaches the shelves.

You can have your truffles tested at DIMS. It costs nothing and gives you certainty about the species and any contaminants at least. Make use of that.

Smartshops must comply with the Warenwet, but enforcement is generic. Choose an established shop with a good reputation if you can.

And perhaps most importantly: the variation in psilocybin content is real. Always start with a low dose, especially when switching batches. That is not fearmongering. That is basic knowledge about how biological products work.

Sources

1. Opiumwet, Wet van 12 mei 1928, Stb. 167

2. Staatsblad 2008/486 — Amendment to the Opiumwet (mushroom ban)

3. Kamervragen nr. 1032 (2011-2012) — Confirmation of sclerotia status

4. Hoge Raad, ECLI:NL:HR:2026:450 — Truffles not a foodstuff (VAT)

5. Eerste Kamer, wetsvoorstel 36159 — NPS-wet (sclerotia exemption)

6. Pellegrini et al. (2013). Psilocybin in sclerotia. Drug Testing and Analysis. DOI: 10.1002/dta.1400

7. Gotvaldova et al. (2022). Tryptamine alkaloids in Psilocybe. IJMS. DOI: 10.3390/ijms232214068

8. Trimbos Institute (2025). Annual Report DIMS 2024.

9. NVWA (2023). Enforcement framework for food products.

10. EU Regulation 2015/2283 — Novel Food

11. Geneesmiddelenwet, Art. 84/85 — Medicine advertising prohibition