THE SCIENCE
The science behind functional mushrooms
Most functional mushroom supplements in the UK are underdosed, made from the wrong part of the mushroom, or extracted in a way that throws away half the active compounds. This page explains what the research actually shows, what it does not, and why dual extraction and proper dosing matter. We will be honest about the difference between strong evidence, preliminary evidence, and laboratory work that has not been tested in people.
What are functional mushrooms
Functional mushrooms are edible fungi studied for bioactive compounds that go beyond basic nutrition. They are foods, not medicines. The term covers a handful of well researched species, and Ffyngau works with three of them: lion’s mane (Hericium erinaceus), reishi (Ganoderma lucidum) and maitake (Grifola frondosa). We grow and process them in Wrexham, North Wales.
When people search for functional mushroom supplements UK, they are usually met with vague promises and very little detail about what is in the jar. We take the opposite approach. Each species has a different bioactive profile, a different research base, and a different reason for being in our range. You can read the specifics on the lion’s mane, reishi and maitake pages.
- Lion’s mane (Hericium erinaceus): studied mainly for cognition and mood.
- Reishi (Ganoderma lucidum): studied mainly for immune markers and general wellbeing.
- Maitake (Grifola frondosa): studied mainly for immune and metabolic markers.
What is dual extraction and why it matters
The active compounds in these mushrooms fall into two broad groups, and they do not dissolve in the same solvent. This single fact is why extraction method matters more than almost anything else on a label.
Water extraction
Hot water pulls out the water-soluble compounds, principally the beta-glucans, a class of polysaccharide found in the fungal cell wall. Beta-glucans do not dissolve in alcohol, so hot water is the right tool for capturing them. This is also why eating raw mushroom is inefficient: the cell walls are tough and the compounds are locked inside until heat and water break them down.
Alcohol extraction
A separate group of compounds, the triterpenes (including the ganoderic acids that give reishi its bitter taste), are alcohol-soluble and largely do not come out in water. To capture them you need an ethanol extraction. A product made with hot water alone will contain beta-glucans but will miss the triterpenes almost entirely.
Why we do both
Dual extraction means running both processes and combining them, so the finished extract carries both the water-soluble beta-glucans and the alcohol-soluble triterpenes. A hot-water-only extract is not wrong, it is just incomplete, and for a species like reishi where much of the studied chemistry sits in the triterpene fraction, water alone leaves a lot behind. Every Ffyngau extract is dual extracted for this reason.
Bioactive compounds: beta-glucans and triterpenes
These are the two compound groups that most of the research focuses on. Here is what current studies associate them with, described in neutral terms.
Beta-glucans
Beta-glucans are branched polysaccharides found in the cell walls of fungi. In laboratory and animal research they are the compounds most often associated with effects on immune cell activity. Some human trials have measured changes in immune markers after supplementation, though the broader picture in people is still developing. Beta-glucan content is also the single most useful number for judging extract quality, which is why a credible product states it and a vague one does not.
Triterpenes
Triterpenes are a large family of compounds particularly abundant in reishi, where the ganoderic acids have been studied in vitro for antioxidant and other activities. Most of this work is laboratory based. Triterpene findings in humans remain limited, and we will not overstate them. Their relevance to a supplement is mainly that they are a distinct, alcohol-soluble fraction that a water-only extract fails to capture, which loops back to why we dual extract.
Dosing: why most products are underdosed
This is the part the industry would rather you did not look at closely. Two common problems make a large share of functional mushroom supplements UK shoppers buy effectively too weak to reflect the doses used in research.
Fruiting body versus mycelium on grain
The fruiting body is the actual mushroom and the part used in most of the human research. A cheaper alternative is mycelium grown on a grain substrate, which is then milled, grain and all, into a powder. The result is heavily diluted with leftover grain starch, and independent testing has repeatedly found such products to be low in beta-glucans and high in starch. If a label does not clearly say fruiting body, assume the worst. Ffyngau uses fruiting body extract only.
Grams per day and what a meaningful dose looks like
Many human trials used substantial daily amounts. The Mori 2009 lion’s mane trial used 3 grams of mushroom powder per day. The Klupp 2016 reishi trial used 3 grams of extract per day. A capsule containing 100mg of a vague “mushroom complex” is not in the same conversation. A meaningful dose means a concentrated fruiting body extract, dosed by the gram or hundreds of milligrams, not by the token sprinkle.
That is the standard we build to. Grym Coffee delivers a minimum of 750mg of dual extracted fruiting body mushroom extract per serving, stated on the label, so you know exactly what you are getting in each cup. Welsh grown, properly dosed.
The evidence base, ingredient by ingredient
Below is a fair summary of the human research on each species. We have cited real, peer-reviewed studies and have been deliberate about flagging small sample sizes, preliminary findings, and work that has only been done in cells or animals. None of this is a claim that any product does anything for you.
Lion’s mane (Hericium erinaceus)
The most cited human study is Mori et al. (2009, Phytotherapy Research), a double-blind, placebo-controlled trial in 30 older Japanese adults with mild cognitive impairment. Over 16 weeks the group taking lion’s mane powder showed significantly higher cognitive scores than placebo, but the scores declined after supplementation stopped, and the sample was small. Separately, Nagano et al. (2010, Biomedical Research) reported reductions in self-rated depression and anxiety measures in 30 women over 4 weeks. Both are small, short trials. Much of the supporting work on nerve growth factor is from cell and animal studies, not humans, so the human evidence should be read as promising but preliminary. Details are on the lion’s mane page.
Reishi (Ganoderma lucidum)
Reishi has one of the larger human literatures, and it is a useful lesson in honesty. A 2016 Cochrane systematic review (Jin et al., Cochrane Database of Systematic Reviews) of five randomised trials with 373 cancer patients concluded that the evidence for reishi as a standalone treatment was limited, while noting it was generally well tolerated. On the metabolic side, Klupp et al. (2016, Scientific Reports) ran a double-blind, placebo-controlled trial of 3 grams per day of reishi extract in 84 people and found no significant effect on the cardiovascular and metabolic markers measured. We include null results like this on purpose. The honest reading is that reishi is well studied and well tolerated, but human outcomes are mixed and far from settled. More on the reishi page.
Maitake (Grifola frondosa)
Human research on maitake is the thinnest of the three. The most relevant trial is Deng et al. (2009, Journal of Cancer Research and Clinical Oncology), a phase I/II study in 34 postmenopausal breast cancer patients that found a maitake polysaccharide extract was associated with measurable, dose-dependent changes in immune parameters, some increased and some decreased, with no dose-limiting toxicity. It was an early-stage immunological study, not a test of clinical outcomes, and the response was complex rather than uniformly positive. Beyond this, most maitake evidence is in vitro or in animals. Human trials remain limited and more are needed. See the maitake page.
The honest bottom line: lion’s mane has the most encouraging small human cognition trials, reishi has the broadest but most mixed human literature, and maitake is the least tested in people. We would rather tell you that than imply certainty that does not exist.
How Ffyngau puts this into practice
Everything above sets the standard we hold ourselves to. We grow our mushrooms in Wrexham, use fruiting bodies rather than grain-grown mycelium, dual extract every batch so both the beta-glucans and the triterpenes make it into the jar, and we state the dose on the label. You can see how this comes together in Grym Coffee, with a minimum 750mg of extract per serving. Welsh grown. Properly dosed.
Ffyngau products are food supplements. They are not intended to diagnose, treat, cure or prevent any disease. If you are pregnant, breastfeeding or taking medication, consult a healthcare professional before use.