Lion's Mane in Ireland: What's In It, What It Does and What to Look For
Lion's mane is the most searched mushroom supplement in Ireland. Here is the two-minute version: what's in it, what the human trials found, what it doesn't do, and what to check on the label before you buy.
Lion's mane (Hericium erinaceus) is an edible mushroom sold in Ireland as a food supplement, regulated by the Food Safety Authority of Ireland (FSAI). It is not a medicine, and no EU health claim is authorised for it. The best human evidence is two small trials reporting higher cognitive test scores after 12 to 16 weeks (Mori et al., Phytother Res, 2009; Saitsu et al., Biomed Res, 2019). No trial has shown a lasting benefit from daily use in healthy adults. Probiotic.ie stocks four lion's mane capsule products, all made from the fruiting body, dispatched from Dublin.
Lion's mane definition: lion's mane (Hericium erinaceus) is a white, shaggy edible mushroom that grows on hardwood trees in Europe, Asia and North America and is dried or extracted into capsules and powders sold as food supplements.
What's in lion's mane
- The mushroom itself. Good products use the fruiting body, the part you can see and eat.
- Polysaccharides and beta-glucans. Complex carbohydrates from the mushroom's cell walls. Beta-glucans are part of the polysaccharide figure, not extra on top.
- Hericenones and erinacines. Small compounds unique to lion's mane. Hericenones are found in the fruiting body, erinacines in the mycelium (the root-like network).
- No caffeine. Lion's mane is not a stimulant.
- No psilocybin. It is not a psychedelic and is unrelated to magic mushrooms.
What the human trials found
- Higher cognitive scores at 16 weeks. 30 adults aged 50 to 80 with mild cognitive impairment took 3 g a day of dried fruiting body. They scored higher than placebo at weeks 8, 12 and 16 (Mori et al., Phytother Res, 2009, PMID 18844328).[1]
- One of three tests improved at 12 weeks. A placebo-controlled trial of a fruiting body supplement found a better MMSE score. The other two cognitive tests showed no difference (Saitsu et al., Biomed Res, 2019, PMID 31413233).[2]
- Faster on one task after a single dose. 41 healthy adults aged 18 to 45 were quicker on a Stroop task 60 minutes after 1.8 g (p=0.005) (Docherty et al., Nutrients, 2023, PMID 38004235).[3]
- Lower self-rated mood scores at 4 weeks. 30 women ate lion's mane cookies or placebo cookies for four weeks (Nagano et al., Biomed Res, 2010, PMID 20834180).[4]
Read this honestly: four small trials, fewer than 150 people in total. Promising, not proven.
What lion's mane doesn't do
- It is not a medicine. It cannot treat, prevent or cure any condition. That is a conversation with your GP.
- It has no approved health claim. No claim is authorised for lion's mane under EU Regulation 1924/2006, so no label can lawfully promise focus, memory or mood.
- No proven lasting effect in healthy adults. After 28 days of daily use, the Docherty trial found no clear cognitive change.[3]
- The effect did not last. In the Mori trial, scores fell back four weeks after people stopped taking it.[1]
- "Grows nerve cells" is lab talk. Hericenones and erinacines are proposed to stimulate nerve growth factor in cell and animal studies only. No human trial has measured it from a capsule.
- It is not the jellyfish. If you came here for the lion's mane jellyfish on Irish beaches, wrong lion's mane.
What to check on a lion's mane label
- Fruiting body or mycelium? They are different raw materials. In the EU, lion's mane fruiting body is not a novel food. Dehydrated mycelium powder is listed as novel and needs authorisation.[5]
- The big number on the front. "3000mg" is often a dried-mushroom equivalent, not what is in the capsule. Look for the extract weight per daily serving.
- Extract or whole powder? An extract can state guaranteed figures. A whole powder states only the weight of mushroom. Neither is better by default.
- A stated beta-glucan or polysaccharide figure. It tells you what the manufacturer guarantees is in there.
- Capsules per day. One a day and four a day change how long a pack lasts.
- The capsule shell. Some are gelatine, so not vegetarian or vegan.
- Your own situation. Mushroom allergy: avoid. Pregnant, breastfeeding, on medication or managing a medical condition: ask your GP or pharmacist first. Adults 18 and over only.
Want the full label-reading walkthrough? See our Mushroom Supplements Ireland guide, which compares lion's mane with reishi, cordyceps, chaga and shiitake.
The four lion's mane supplements at Probiotic.ie
All four use fruiting body, not mycelium. Figures are from each product's label at the recommended daily serving. Swipe the table sideways on a phone.
| Product | Form | Per day | Label states | Days per pack | Vegan |
|---|---|---|---|---|---|
| Osavi Lion's Mane 600mg | Extract, 30:1 | 1 capsule, 600 mg extract | Min. 40% polysaccharides, of which min. 20% beta-glucans | 120 | Yes |
| KIKI Health Organic Lion's Mane Extract | Organic hot-water extract, 15:1 to 17:1 | 2 to 4 capsules, 800 to 1,600 mg extract | 50% beta-glucan-rich polysaccharides | 15 to 30 | Yes |
| Wiseshrooms Organic Lion's Mane 3000mg | Organic extract, 12:1 | 3 capsules, 250 mg extract (3,000 mg dried equivalent) | 30% polysaccharides | 30 | Yes |
| Swanson Lion's Mane 500mg | Whole powder, not extracted | 2 capsules, 1,000 mg powder | Not standardised | 30 | No (gelatine) |
The highlighted row gives the longest supply per pack. Prices change, so each product page shows the current price including Irish VAT at 13.5%. No trial used these exact products, and trial doses (1.8 to 3 g a day) cannot be compared directly with extract milligrams.
Product details on this page, including form, extraction ratio, amount per daily serving, standardisation, capsule count and capsule shell, were verified by Probiotic.ie against the live product listings on 8 October 2026. Always check the label on the pack you receive, as formulations may change.
Legal status, VAT and delivery in Ireland
- Legal to buy. Lion's mane is a food supplement in Ireland, regulated by the FSAI.[7] Medicines are regulated separately by the Health Products Regulatory Authority (HPRA), and lion's mane is not one.
- 13.5% VAT. Food supplements carry Ireland's reduced VAT rate, not the 23% standard rate.[6]
- No customs charges. Stock is held in Dublin, so there is no import VAT or customs fee. Orders from outside the EU now carry extra charges (see customs charges Ireland).
- Tracked DPD delivery. Normally dispatched the next working day. Free on Irish orders over €75.
The clinical and mechanistic research discussed in this article relates to lion's mane as a studied mushroom. It should not be read as a claim that Osavi Lion's Mane 600mg, or any other product sold by Probiotic.ie, produces these effects. These products are food supplements, not medicines. No authorised EU health claim is currently made for lion's mane on this page or on any product.
Osavi Lion's Mane 600mg, 120 Vegan Capsules
Fruiting body extract with polysaccharide and beta-glucan content stated on the label. One capsule a day, so one pack lasts 120 days.
Current price on the product page, including Irish VAT at 13.5%. Food supplement, not a medicine. Tracked DPD delivery nationwide, free on Irish orders over €75. Authorised Irish retailer for Osavi. Prefer another format? Compare the full lion's mane range.
Lion's mane: quick questions
What is lion's mane used for?
Lion's mane (Hericium erinaceus) is an edible mushroom eaten as food in East Asia and sold in Ireland as a food supplement, usually in capsules. People mostly look it up for focus and memory. Two small placebo-controlled trials, Mori et al. (Phytother Res, 2009, PMID 18844328) in adults aged 50 to 80 and Saitsu et al. (Biomed Res, 2019, PMID 31413233), reported higher cognitive test scores after 12 to 16 weeks. No EU health claim is authorised for lion's mane.
How much lion's mane should I take per day?
There is no official recommended intake and no EU Nutrient Reference Value for lion's mane. Human trials used 1.8 g to 3 g a day of lion's mane (Docherty et al., Nutrients, 2023; Mori et al., Phytother Res, 2009). Products differ in concentration, so the milligrams on one label are not comparable with another label or with trial doses. Follow the label on the product you buy and do not exceed the stated daily amount.
What time of day should I take lion's mane?
No human trial has compared morning with evening, so there is no evidence-based best time. Lion's mane contains no caffeine and is not a stimulant. Most labels suggest taking capsules with or after a meal.
How long does lion's mane take to work?
The trials measured results at different points. Docherty et al. (Nutrients, 2023, PMID 38004235) reported a faster Stroop task result 60 minutes after a single dose in healthy young adults, but no clear cognitive change after 28 days. Saitsu et al. 2019 measured at 12 weeks and Mori et al. 2009 at 16 weeks, and in the Mori trial scores fell back four weeks after stopping. Nothing in these trials establishes an effect from routine daily use in healthy adults.
Does lion's mane have side effects?
In the published trials lion's mane was well tolerated, and Mori et al. (Phytother Res, 2009, PMID 18844328) reported no adverse effect on laboratory tests over 16 weeks. The trials were small and short, so long-term data are limited. Do not take lion's mane if you have a mushroom allergy. If you are pregnant, breastfeeding, taking medication or have a medical condition, speak to your GP or pharmacist first. The products sold in Ireland are for adults aged 18 and over.
Is lion's mane legal in Ireland?
Yes. Lion's mane is sold legally in Ireland as a food supplement, regulated by the Food Safety Authority of Ireland (FSAI), and it is not a medicine. The EU Novel Food Status Catalogue records lion's mane fruiting body as not novel, while dehydrated lion's mane mycelium powder is listed as novel and needs authorisation before sale. Irish VAT on food supplements is 13.5%.
Is lion's mane a psychedelic or a stimulant?
No. Lion's mane (Hericium erinaceus) contains no psilocybin and is unrelated to magic mushrooms. It contains no caffeine and is not a stimulant. It is an edible mushroom sold in Ireland as a food supplement, and it has nothing to do with the lion's mane jellyfish found in Irish waters.
Where can I buy lion's mane in Ireland?
Probiotic.ie stocks four lion's mane capsule products in Dublin: Osavi Lion's Mane 600mg, KIKI Health Organic Lion's Mane Extract, Wiseshrooms Organic Lion's Mane 3000mg and Swanson Lion's Mane 500mg. Orders are dispatched from Dublin by tracked DPD delivery with no customs charges, and delivery is free on Irish orders over €75. Pharmacies and health food shops in Ireland also stock lion's mane.
Related guides from Probiotic.ie
This guide was prepared by Probiotic.ie using the following process:
- Reviewed the four published human trials of lion's mane: Mori 2009, Saitsu 2019, Docherty 2023 and Nagano 2010.
- Separated cell and animal findings from human trial results, and stated where the evidence is negative or absent.
- Checked every PMID against its PubMed or publisher record on 8 October 2026.
- Used the EU Novel Food Status Catalogue position recorded for our mushroom guide on 15 September 2026, and followed FSAI food supplement rules for Irish compliance.
- Verified the details of all four products against the live listings on 8 October 2026.
- Made no disease-treatment claims and no EU health claims for lion's mane.
Sources
- [1] Mori K, Inatomi S, Ouchi K, Azumi Y, Tuchida T. Improving effects of the mushroom Yamabushitake (Hericium erinaceus) on mild cognitive impairment: a double-blind placebo-controlled clinical trial. Phytother Res. 2009;23(3):367-372. PMID 18844328. — pubmed.ncbi.nlm.nih.gov/18844328
- [2] Saitsu Y, Nishide A, Kikushima K, Shimizu K, Ohnuki K. Improvement of cognitive functions by oral intake of Hericium erinaceus. Biomed Res. 2019;40(4):125-131. PMID 31413233. — pubmed.ncbi.nlm.nih.gov/31413233
- [3] Docherty S, Doughty FL, Smith EF. The Acute and Chronic Effects of Lion's Mane Mushroom Supplementation on Cognitive Function, Stress and Mood in Young Adults: A Double-Blind, Parallel Groups, Pilot Study. Nutrients. 2023;15(22):4842. PMID 38004235. — pubmed.ncbi.nlm.nih.gov/38004235
- [4] Nagano M, Shimizu K, Kondo R, Hayashi C, Sato D, Kitagawa K, Ohnuki K. Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomed Res. 2010;31(4):231-237. PMID 20834180. — pubmed.ncbi.nlm.nih.gov/20834180
- [5] European Commission. Novel Food Status Catalogue. — ec.europa.eu/food/food-feed-portal/screen/novel-food-catalogue/search
- [6] Revenue Commissioners. Tax and Duty Manual: VAT treatment of food supplement products and certain other products (reviewed December 2024). — revenue.ie (PDF)
- [7] Food Safety Authority of Ireland. Food Supplements: legislation and guidance. — fsai.ie/legislation/food-legislation/food-supplements