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It's the question we get asked most about sclerotia: which is the strongest? A legitimate question, but also the most difficult to answer honestly, because the magic truffle market operates with trade names—Valhalla, Utopia, Hollandia—and not with laboratory analyses.
At Alchimia we work with two different ranges, and it's worth knowing this before comparing: the Mondo range, which publishes its own potency scale from 1 to 6, and a premium range of Dutch references that doesn't use that scale. Comparing within Mondo is easy; comparing between ranges requires nuance. Let's look at the five most concentrated in the catalogue, with those nuances upfront.

How to read any potency ranking
Three things worth keeping in mind:
- The real range is narrower than the names suggest. The psilocybin and psilocin content in sclerotia ranges between 0.31% and 0.68% by dry weight depending on the strain and growing conditions. Between the mildest variety and the most concentrated there are approximately twice as many active compounds. It's a noticeable difference, but not what the jump from "Mexicana" to "Valhalla" suggests.
- Truffles are fresh. Around three-quarters of their weight is water, and that percentage varies between batches. The grams in the package don't translate directly into active principle.
- No commercial scale is an analysis. The Mondo scale is useful because it's internally consistent and published, but it's a manufacturer's classification, not laboratory data. Between different brands, any comparison is indicative.
5. Utopia
The gateway to the peak within the Mondo range. Cultivating Utopia magic truffles requires a notably longer cycle than mild varieties, and this extended maturation is reflected in the concentration of active compounds.

The psychonautic community describes it with an expansive profile and a pronounced visual component, both with eyes open and closed. It recurrently appears as the recommended previous step before considering the next level.
For whom: the natural leap for those who already know Atlantis (4/6) and are looking to move up a level with a clear reference.
4. Old Dutch
The Old Dutch magic truffles variety is one of the classic varieties of Dutch selective cultivation, and the first on this list outside the Mondo scale. Its documented profile is associated with waves of euphoria, and in smartshop literature it appears specifically noted as a strain suitable for high doses—that is, for those seeking to explore the upper end of the range.
As it doesn't belong to the Mondo range, it has no score on the 1-6 scale. Its position here is based on the classification given by Dutch distributors, not on data comparable to the previous ones.
For whom: profiles already familiar with the high range who want to step outside the Mondo catalogue.
3. Double Vision
The most peculiar reference in the catalogue, and the one that can be positioned most accurately without speculation: Double Vision is a 50% blend of Utopia and Old Dutch. It's not a distinct strain, but a deliberate combination of the two previous ones on this very list.
This gives it a dual profile that the community describes as reflective and introspective, with the sensory load of Utopía and the euphoric component of Old Dutch. By combining two varieties from the high range, the result sits above either of its two components separately.
For whom: those who have already tried Utopía or Old Dutch separately and are curious about the middle ground—which in practice is a higher point.
2. Valhalla
Probably the most recognized sclerotia variety in Europe. It occupies first place in the potency rankings of most Dutch smartshops, and some catalogs place it directly off the scale.

Its data indicates an approximate content of 1.4 mg of psilocybin and 0.2 mg of psilocin per gram of fresh weight. Botanically it is described as sclerotia of Psilocybe tampanensis, although its exact origin remains a subject of debate: some attribute it to a Dutch breeding project and others defend a wild origin.
Its documented profile combines a very marked visual component with a pronounced introspective and philosophical side. Unlike the more sociable strains, Valhalla tends to direct attention inward.
For whom: advanced profiles seeking introspective load rather than sensory stimulation.
1. Hollandia
The absolute first place on the Mondo scale, and the only variety in the catalog whose maximum position is documented by the manufacturer itself.
According to information from Mondo, its psilocybin and psilocin content can reach up to twice that of other varieties in the range: it surpasses Utopía (5/6), doubles the concentration of Atlantis (4/6) and triples that of Mexicana (2/6). A 15-gram package is considered in the community sufficient for two high-range sessions, which says quite a bit.

Unlike varieties with Mesoamerican roots, Hollandia is a product of Dutch selective cultivation: its developers dedicated more than two years to a selection process specifically aimed at surpassing the concentration of everything available on the market.
Its profile is described as the most intense and enveloping in the range, with a constant sensory component throughout the entire experience rather than appearing only in peaks. A practical detail: its flavor is considered less bitter than that of most sclerotia, with a nutty nuance.
For whom: exclusively for connoisseurs with extensive experience who have already explored Utopia or Atlantis. It is not a variety appropriate for first experiences or for microdosing.
So, Hollandia or Valhalla?
It's the inevitable comparison, and the honest answer is that there is no data that allows settling it. They are different brands, with different scales, without independent analyses measuring them with the same criteria. Mondo places Hollandia at its maximum; Valhalla distributors place it at theirs. Both are at the upper extreme of what is marketed in Europe.
What can be stated is that the difference between them is much smaller than the difference between either of them and a mid-range variety. And that, having reached that extreme of the scale, the determining factor ceases to be the strain.
A note on approach
Entering the catalog looking directly for the most concentrated reference is one of the decisions that most frequently ends in an unpleasant experience. The Mondo scale is designed precisely to be traversed in order: each step allows calibrating individual sensitivity—which varies greatly between people—before moving up to the next.
Set & Setting: Keys to a Positive Psychedelic Experience
Did you know that your mindset and environment have a greater influence on your psilocybin mushroom experience than the dose itself? Discover what Set & Setting means, why it matters so much, and how to prepare your mind and space for a safe, enriching, and truly transformative psychedelic journey.
In practice, what most determines the character of the experience is not the variety, but what the psychonautic community calls set & setting: the prior mental state and the physical environment.
With the five references on this list, that factor goes from important to decisive.
