Mushroom Gummies: Do They Work? Lion’s Mane and Reishi Gummies, Doses and Safety (UK)

What’s in a mushroom gummy?

A mushroom gummy is a sweet, chewy base (usually sugar or glucose syrup, set with pectin) with a small amount of mushroom extract mixed in. The most common mushrooms are:

• Lion’s mane (Hericium erinaceus), usually sold for focus. See our full guide to lion’s mane.
• Reishi (Ganoderma lucidum), usually sold for evenings. See reishi mushroom.
• Blends of four to ten mushrooms, often with cordyceps, chaga, turkey tail, maitake or shiitake.

The catch is size: a gummy weighs a few grams, mostly the sweet base. One UK reishi gummy we checked in October 2026 weighs 4g, contains 3g of sugar and just 25mg of reishi extract. A lion’s mane gummy we checked provides 500mg of a 2:1 extract per two-gummy serving, so 250mg a gummy. Several blend gummies list a total for the whole blend without saying how much of each mushroom is in it.

Here’s how that compares with the amounts used in human studies:

Extracts are more concentrated than dried powder, so this isn’t exactly like for like, but the gap is often large.

Do mushroom gummies work?

No published trial has tested mushroom gummies themselves. What exists is a small body of research on lion’s mane and reishi in other forms:

• Lion’s mane: a 2025 systematic review found only five randomised controlled trials and three pilot trials in people, mostly small. In the 16-week Japanese trial, cognitive scores rose compared with placebo, then fell within 4 weeks of stopping. The UK pilot study had mixed results, and its authors urged caution.
• Reishi: the 2005 trial in people with long-term fatigue used a high-dose polysaccharide extract. Cochrane reviews of reishi for cancer and for heart disease risk factors found the evidence too limited to support its use for those conditions.

So the honest answer is that we don’t know, and a low-dose gummy is the format least likely to match the studies. For a side-by-side look at the three most popular mushrooms, see lion’s mane vs reishi vs cordyceps.

How long do mushroom gummies take to work?

Most of the studies above ran for 4 to 16 weeks of daily use. There’s no good evidence of a noticeable effect within hours.

Mushroom gummies for ADHD, weight loss, gut health or menopause

iNone of these has been tested in a trial of mushroom gummies. There are no human studies of lion’s mane in ADHD (see lion’s mane), so don’t change ADHD medication without your doctor. For menopause, see mushrooms for menopause.

Reishi gummies: what to check

Reishi gummies often contain only a little reishi: one UK gummy we checked had 25mg of extract. Before you buy, check the milligrams of reishi per gummy, whether it’s an extract or plain powder (and the extract ratio), fruiting body or mycelium, the beta-glucan percentage, the sugar per serving, and gelatine or pectin. Reishi has no authorised health claims in the UK.

“Red reishi” usually means Ganoderma lucidum, the reddish-brown reishi in most products. Research on it is mostly laboratory work, with few, small human trials (see our reishi mushroom guide).

iReishi has rare case reports of liver injury and may raise bleeding risk, so check with your GP or pharmacist if you take blood thinners or other medicines, have surgery planned, or are pregnant or breastfeeding. Gummies look like sweets: keep them away from children.

Prefer no sugar? Compare reishi tea with reishi powder, tincture or capsules. For gummy label maths, see Ankhway mushroom gummies; the same checks apply to tremella gummies.

Functional mushroom capsules vs gummies vs powders: a comparison

Functional mushroom capsules, gummies and powders can contain the same mushrooms in very different amounts. Powders and capsules usually give the most mushroom per serving with no sugar. Gummies are limited by their size, often 25mg to 500mg of extract at the label dose, plus sugar or sweeteners. No format has been shown to be absorbed better.

Absorption: there’s no evidence that one format is absorbed better. What matters more is the type of extract and how much you take.

Gummies win on taste and ease; capsules and powders usually give you more mushroom for less sugar. The gummy format tends to trade dose for taste, as we found with CBD oil vs gummies and apple cider vinegar gummies. Prefer a cup? See mushroom coffee or mushroom tea.

Where our reishi drink fits

We don’t make a mushroom gummy. Our Reishi Mushroom Adaptogenic Complex is a powder you stir into warm milk or water to make a reishi hot chocolate. It contains cocoa, reishi mushroom, maca, cinnamon and coconut sugar (which still counts as sugar). The cacao gives it a little natural caffeine. It’s vegan and made in the UK. Reishi has no authorised health claims, so think of it as an evening ritual, not a remedy. More in reishi cacao benefits and healthy hot chocolate.

How to read a mushroom gummy label

1. Milligrams of each mushroom per gummy. “Mushroom blend 1,000mg” tells you nothing about how much lion’s mane or reishi you get. Look for each species listed with its own amount.
2. The extract ratio, and what it hides. A 10:1 ratio means about 10kg of dried mushroom went into 1kg of extract. Labels often turn this into an “equivalent” figure: 400mg of a 10:1 extract becomes “4,000mg”. The real amount in the gummy is 400mg. Ratios aren’t standardised and don’t tell you which compounds were concentrated.
3. Fruiting body or mycelium. The fruiting body is the mushroom itself. Mycelium is the root-like network, often grown on grain such as oats or rice. A 2025 lab study found chaga products made from mycelium on fermented grain were rich in starch and chemically different from real chaga. Mycelium isn’t always worse (one lion’s mane trial used it), but it should be named.
4. Beta-glucans, not just “polysaccharides”. Starch is a polysaccharide too, so grain can inflate that figure. Lab methods can measure beta-glucan separately from starch, so a beta-glucan percentage tells you more.
5. Third-party testing. Look for independent lab reports for heavy metals and microbes that the brand will share.
6. Novel food status. The FSA says any food not eaten to a significant degree in the UK or EU before 15 May 1997 is a novel food and must be authorised before it can be sold in Great Britain. That can depend on the species and how the extract is made, so ask the brand.
7. Honest claims. The Advertising Standards Authority notes there are no authorised health claims for mushrooms themselves. Some gummies add a vitamin or mineral, such as zinc, and the health claim on the pack is about that nutrient, not the mushroom.

For the same checklist applied to capsules and powders, see the best mushroom supplements in the UK and our functional mushrooms UK guide.

Sugar and your teeth

The NHS says adults should have no more than 30g of free sugars a day, roughly 7 sugar cubes, and that sugar is one of the main causes of tooth decay. The reishi gummy we checked has 3g of added sugar each, about a tenth of that limit per gummy.

• Take sugary gummies with a meal rather than as a snack: the NHS advises keeping sugary foods to mealtimes.
• “Sugar-free” gummies often use polyols such as maltitol, sorbitol or erythritol. Large amounts can upset your stomach.

Side effects and who should avoid them

Lion’s mane and reishi are edible mushrooms and are generally well tolerated in studies, but they aren’t risk-free:

• Reishi and your liver. The US LiverTox database says reishi is well tolerated but has been linked to rare single cases of acute liver injury, although other causes often weren’t ruled out. One fatal case followed a switch to reishi powder. Stop and see a GP if you get yellow skin or eyes, dark urine or unusual tiredness.
• Reishi and bleeding. Reishi may increase the risk of bleeding, so take extra care with blood thinners such as warfarin, and tell your surgeon or dentist before an operation.
• Reishi and other medicines. It may affect blood sugar and the immune system, so check first if you take diabetes medicines, immunosuppressants or chemotherapy.
• Lion’s mane. Reported side effects include stomach discomfort, headache and allergic reactions. Avoid it if you’re allergic to mushrooms.
• Pregnancy and breastfeeding. There isn’t enough safety research. We don’t recommend our products during pregnancy or breastfeeding.
• Medicines. Speak to your GP or pharmacist before taking any mushroom supplement if you take regular medication.
• Children. Mushroom supplements haven’t been tested in children, and gummies look like sweets. Keep them out of reach. Our products are for adults only.

Not the same as “magic mushroom” gummies

Functional mushroom gummies contain no psilocybin. But some products sold online as “mushroom” gummies or chocolates are psychoactive. In 2024, US authorities linked one brand’s chocolates, cones and gummies to 180 reported illnesses and 73 hospital admissions, and testing found undeclared substances including muscimol, psilocin and pregabalin. Magic mushrooms are a Class A drug in the UK. Buy from brands that list every ingredient and amount.

How to choose mushroom gummies in the UK

1. Pick the mushroom first. Lion’s mane is usually taken in the day and reishi in the evening; see reishi for sleep.
2. Check the mg of each mushroom per gummy against the study amounts above, plus fruiting body or mycelium.
3. Check the sugar or sweetener per serving.
4. Ask for lab reports for heavy metals and microbes.
5. Walk away from big promises. Gummies that claim to cure anxiety or treat menopause are breaking UK advertising rules. See what the evidence shows in mushrooms for anxiety.

If a gummy has only a small amount of extract, you may be paying mainly for a sweet. A capsule, powder or mushroom drink can be better value.

Related guides

• There’s no evidence that reishi taken by mouth changes your skin; our guide to reishi and skin explains what has been studied.
• Chaga brings its own safety questions: see our chaga mushroom guide for the oxalate and kidney evidence.
• DIRTEA gummies: the mushrooms and added vitamins in each one.
• Holland and Barrett’s own lion’s mane gummies are covered in lion’s mane at Holland and Barrett.
• The same label questions apply to ashwagandha gummies, which we compare with tinctures, capsules and powder.
• If you’re comparing gummies with other formats, our reishi powder vs tincture vs capsules guide sets out the differences.
• See what’s in one popular brand, with the label maths, in our guide to Ankhway mushroom gummies.
• Before choosing a blend with turkey tail, read turkey tail side effects and safety, including who should avoid it.
• Tremella gummies are sold for skin; see tremella mushroom benefits and side effects for what the research shows.
• Blends that include shiitake can still trigger shiitake dermatitis, so it’s worth knowing the side effects of shiitake mushrooms before you buy.
• For reishi capsules, powders and drinks compared, see the best reishi supplement in the UK.
• Are gummy vitamins as good as pills?