Mushroom Supplements UK: Do Mushroom Gummies Actually Work?

By the GUUDIES Editorial Team · Updated 26 October 2026 · Health claims checked against the GB Nutrition and Health Claims Register (sources below).

Disclosure: GUUDIES makes a daily gummy pouch that includes a mushroom gummy, so we have an interest here. We have kept to what the research shows and what can lawfully be claimed in the UK.

Are mushroom supplements worth taking, and do mushroom gummies work? Functional mushrooms such as lion's mane, reishi, cordyceps, chaga and shiitake have a long history of traditional use and a growing body of early research, but most human studies are small, and there are no authorised health claims for any of them in Great Britain. The honest answer is that a mushroom gummy can be a pleasant, convenient way to include these fungi in your routine, and you should be wary of any product that promises specific results.

Mushroom supplements have moved from health shops into supermarkets and social feeds. Quality varies enormously, and labels can be hard to read. This guide covers what each mushroom is, what the research has actually looked at, how gummies compare with capsules and powders, and what to check before you buy.

What Are Functional Mushroom Supplements?

"Functional mushrooms" are species eaten or used for reasons beyond flavour. They contain compounds such as beta-glucans (a type of fibre found in fungal cell walls), triterpenes and, in lion's mane, hericenones and erinacines. Supplements use either the fruiting body (the mushroom itself) or mycelium (the root-like network), usually dried and extracted.

None of the common functional mushrooms are psychoactive. Lion's mane, reishi, cordyceps, chaga and shiitake are culinary or traditional fungi, not "magic mushrooms".

The Five Most Common Mushrooms in Supplements

Lion's mane (Hericium erinaceus)

A white, shaggy, edible mushroom that grows on hardwood trees. It is the most studied functional mushroom for the brain. A small 2009 Japanese trial in 30 older adults with mild cognitive impairment reported better scores on a cognitive test after 16 weeks than placebo, with scores falling again once people stopped. That is an interesting early signal, not proof, and it has not been established in larger trials.

Reishi (Ganoderma lucidum)

A woody, bitter bracket fungus traditionally prepared as a tea. It has been studied for immune markers and wellbeing, but a Cochrane review found the human evidence limited. Reishi may interact with blood-thinning medication, so check with a pharmacist if that applies to you.

Cordyceps (Cordyceps militaris)

A small orange fungus that can be cultivated, unlike the rare wild Cordyceps sinensis. It is popular with people interested in exercise, and small trials on exercise performance have produced mixed results.

Chaga (Inonotus obliquus)

A hard, charcoal-like growth on birch trees in cold climates. Most chaga research is laboratory or animal work, with very little in people. Chaga is high in oxalates, so people with kidney problems should avoid concentrated chaga.

Shiitake (Lentinula edodes)

The familiar supermarket mushroom, with the longest record of everyday dietary use. A 2015 study in 52 healthy adults who ate shiitake daily for four weeks reported changes in some immune cell markers, which shows activity but not a health benefit.

Mushroom Supplements Compared

Mushroom	Main compounds	What human research has looked at	Authorised GB health claim?
Lion's mane	Hericenones, erinacines, beta-glucans	Memory and cognition (small trials)	No
Reishi	Triterpenes, beta-glucans	Immune markers, wellbeing (limited)	No
Cordyceps	Cordycepin, beta-glucans	Exercise performance (mixed)	No
Chaga	Polyphenols, betulinic acid	Mostly laboratory studies	No
Shiitake	Lentinan, beta-glucans	Immune cell markers (small study)	No

Do Mushroom Gummies Work as Well as Capsules or Powder?

Capsules can hold more extract per dose and are the format most research uses. Powders can deliver large amounts but often taste earthy and need mixing. Gummies hold less material per piece but are the easiest to take every day, and consistency is what most people struggle with.

Because there are no authorised claims, the useful question is less "does it work" and more "is it what the label says, at a dose that is clearly stated". A gummy that declares each mushroom and amount is more trustworthy than one listing an unnamed "mushroom complex".

How to Choose a Mushroom Supplement

• Named species and amounts. Each mushroom should be listed with its Latin name and dose.
• Fruiting body or mycelium? Both are used. Mycelium grown on grain can contain a lot of starch from the grain, so look for clear labelling.
• Extract details. Reputable brands say whether they use an extract and how it was made.
• Sugar per gummy. Many gummies contain 2 to 3g of sugar each. Check the "of which sugars" figure.
• Realistic wording. Promises to sharpen focus, cure stress or boost immunity are not authorised for mushrooms in the UK.

Are Mushroom Supplements Safe?

Culinary mushrooms are generally well tolerated, but concentrated supplements are different from food. Speak to your GP or pharmacist before taking them if you are pregnant or breastfeeding, take blood thinners, diabetes medication or immunosuppressants, have kidney problems, or have a mushroom allergy. Stop if you notice a reaction.

Where GUUDIES Fits

The Mushroom Mix gummy is one of six gummies in each GUUDIES daily pouch. It contains five mushrooms, lion's mane, shiitake, chaga, reishi and cordyceps, in a pectin-based, vegan, mixed berries gummy with around 0.4g of sugar. We do not claim it does anything specific, because no mushroom has an authorised health claim in the UK. It is there for people who want these fungi in one simple daily habit.

Five of the six gummies in the pouch are vegan; the Marine Collagen gummy contains fish collagen. See what is in a GUUDIES pouch.

Common Questions

Do mushroom gummies work?
Early studies on mushrooms such as lion's mane are interesting, but most are small, and no functional mushroom has an authorised health claim in the UK. Treat a mushroom gummy as a convenient way to include these fungi, not a guaranteed result.

What are the best mushroom supplements in the UK?
Look for named species with Latin names and declared amounts, clear fruiting body or mycelium labelling, low sugar, and no exaggerated promises.

Which mushroom is best for focus?
Lion's mane is the most studied for cognition, but the evidence is still early and there is no authorised claim for it.

Are mushroom supplements safe to take every day?
Most adults tolerate them, but check with your GP or pharmacist if you are pregnant, breastfeeding, on medication, or have a mushroom allergy or kidney problems.

Are functional mushrooms psychoactive?
No. Lion's mane, reishi, cordyceps, chaga and shiitake contain no psilocybin.

How long should I take a mushroom supplement before judging it?
Studies typically run for 8 to 16 weeks, so give any routine a few months of consistent use.

Sources

• Mori K et al. Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment. Phytotherapy Research, 2009: PubMed
• Jin X et al. Ganoderma lucidum (Reishi mushroom) for cancer treatment. Cochrane Database of Systematic Reviews, 2016: doi.org
• Dai X et al. Consuming Lentinula edodes (shiitake) mushrooms daily improves human immunity. Journal of the American College of Nutrition, 2015: PubMed
• GB Nutrition and Health Claims Register: gov.uk

Related Reading

Reishi, Chaga and Cordyceps: What Each Mushroom Is · Lion's Mane Gummies Guide · Focus Gummies · See our full ingredient list