Lion's Mane: What the Research Says, and How to Buy a Real One (2026)
In two trials of adults over 50, about 3 g a day of dried lion’s mane for 12 to 16 weeks beat a dummy pill on one thinking test. Trials in healthy young adults found little change, so the results are mixed, and all the trials are small. Lion’s mane is an edible mushroom sold for memory and focus.
The 3 best lion’s mane supplements · Prices
What the trials found
We read 9 trials of lion’s mane in people. A 2025 review counted five randomized trials and three small pilot trials (Menon 2025). Most were small and short, and we found none that compared doses.
- Thinking tests. Two trials in adults over 50 found better scores than placebo (a dummy pill) on one thinking test, with about 3 and 3.2 g a day of dried fruiting body for 12 to 16 weeks (Mori 2009; Saitsu 2019). In Saitsu 2019, two other tests did not change; in Mori 2009, scores fell again 4 weeks after people stopped.
- Mood. Two trials found lower mood-complaint scores than at the start, but one compared against placebo on only two items and the other had no placebo group (Nagano 2010; Vigna 2019).
- Healthy young adults. Single doses mostly changed little, though a few reaction-time and hand-skill tests improved (Docherty 2023; Surendran 2025; La Monica 2023). 10 g a day for 4 weeks changed nothing (Grozier 2022).
- Nerve growth factor. In cells and mice, lion’s mane extract raised nerve growth factor, a protein that helps nerve cells grow (Mori 2008). That has not been shown in people.
Every trial, with who took part is at the end of this page.
How long the trials ran
The daily trials ran 4 to 49 weeks. In the 16-week trial, scores were better than placebo from week 8, and they fell 4 weeks after people stopped (Mori 2009). Single doses changed little. No trial shows a quick effect.
What lion’s mane is
- The mushroom. Lion’s mane (Hericium erinaceus) is an edible mushroom. The part you see is the fruiting body. Mycelium is the root-like part; some makers grow it on rice or oats and sell it with the grain.
- How much. There is no official dose. Most daily trials gave about 1 to 3.2 g a day; one used 10 g in muffins and found no effect. How much to take.
How to read a lion’s mane label
- Fruiting body or mycelium? The label should name the part. “Mycelium” grown on “rice,” “oats” or “biomass” means the grams include the grain. 5 of the 24 products we score say so.
- Extract or powder? An “8:1” or “4:1” extract is sold by the raw mushroom it came from. A 4:1 extract label that says “equivalent to 4,200 mg” may hold 1,050 mg of extract a serving. Read the extract line on the panel.
- Beta-glucan stated? Beta-glucan, a fiber in the mushroom’s cell walls, is the figure that compares labels. Only 7 of the 24 we score state it, on the label, the brand’s page or a posted lot report. Lab methods count it as total glucan minus starch, so grain starch does not count (McCleary 2016). “Polysaccharides” is not the same figure.
- A testing list? “Third-party tested” on a bottle is the brand’s claim. Check the list itself (below).
Which lion’s mane is third-party tested
Of the 24 lion’s mane products we score, 2 are on a public testing list we checked on October 6, 2026. Both are in our 3 best.
| Product | List | What the list checks |
|---|---|---|
| Double Wood Lion's Mane Mushroom 500 mg | NSF/ANSI 173 | The bottle holds what the label says |
| Transparent Labs Mushroom StackA three-mushroom blend | Informed Choice | Substances banned in sport |
What lion’s mane costs
Compare beta-glucan, not grams. A gram of extract, a gram of dried mushroom and a gram of mycelium with its grain are different things. Per gram, the products we score run $0.099 to $3.43 at each brand’s list price. Where a brand states its beta-glucan, 100 mg of it costs at most $0.19 to $0.57. What a gram costs, brand by brand.
Lion’s mane guides
Which product
How much
We read 30 lion’s mane products and could score 24 (how we score). Prices are each brand’s own list price; other stores may differ.
Side effects
- In trials. In the 16-week trial, lab tests showed no harmful effect (Mori 2009). In the 49-week trial, four people dropped out for stomach upset, nausea or rash (Li 2020). The trials were small and short.
- What a 2025 review lists. Stomach discomfort, headache and allergic reactions, though trials rarely reported side effects (Menon 2025).
- A rare serious reaction. One published case report: a 63-year-old man had a serious lung reaction linked to a lion’s mane extract. He recovered with treatment (Nakatsugawa 2003). Stop and get help if you have trouble breathing.
- No upper limit. No agency sets one, and there is little long-term safety data.
Check with a doctor first if you
- take a blood thinner. Lab tests on platelets suggest a possible blood-thinning effect; no human trial has tested it (Mori 2010).
- take any other medicine
- are pregnant or breastfeeding
- are allergic to mushrooms
Every trial, with who took part
9 human trials (dose, length, people and result)
| Trial | Dose and length | What it found |
|---|---|---|
| Mori 200930 adults aged 50 to 80 with mild memory problems; the first author works for a mushroom producer | 3 g a day, 16 weeksDried fruiting body (tablets; about 2.9 g of mushroom) | Better scores on a thinking scale than placebo at weeks 8, 12 and 16; scores fell again 4 weeks after stopping |
| Nagano 201030 women, average age 41 | 2 g a day, 4 weeksDried fruiting body in 4 cookies | Lower mood and complaint scores than at the start; against placebo, only two complaint items differed |
| Saitsu 2019Healthy adults over 50 | 3.2 g a day, 12 weeksDried fruiting body | One of three thinking tests improved against placebo; two did not |
| Li 2020A small pilot in older adults with early memory loss; run by the mycelium’s maker | 1.05 g a day, 49 weeksSpecially grown mycelium (erinacine A) | The authors report higher thinking and daily-living scores than placebo; only the daily-living gap is a stated between-group result. Four people dropped out for stomach upset, nausea or rash |
| Vigna 201977 adults on a low-calorie diet | 1.5 g a day, 8 weeksMycelium plus fruiting-body extract | 40 took it and 37 did not (diet only, no placebo). Mood and sleep scores fell from the start |
| Docherty 202341 healthy adults aged 18 to 45 | 1.8 g a day, 28 daysThree 600 mg capsules | One faster test an hour after the first dose; after 28 days, no clear change |
| Grozier 202224 college-age adults | 10 g a day, 4 weeksIn muffins | No effect on memory, thinking or metabolism |
| Surendran 202518 healthy adults aged 18 to 35 | 3 g, one dose10:1 fruiting-body extract | No overall change in thinking or mood; one hand-skill test improved |
| La Monica 2023Healthy adults | 1 g, one doseNordic-grown lion’s mane | A few reaction-time and working-memory measures improved over 2 hours |
Some trials were in people with memory problems; ask a doctor about those.
How we checked this
Products. We read 30 lion’s mane products and could score 24. Scores updated October 6, 2026.
Testing lists. We read NSF/ANSI 173 (all 3,143 rows, plus searches by company and by trade name), NSF Certified for Sport, Informed Choice and Informed Sport in full on October 6, 2026. USP’s site blocks automated reads, so its list comes from our copy of September 22, 2026.
Beta-glucan. Every figure is the brand’s own: its label, its product page, or a lot report it posted. Real Mushrooms’s label states 300 mg or more a serving, and its posted SGS report (April 7, 2025) measured 30.5%. We did not test any product.
Prices. Each brand’s own list price for one pack. We quote no Amazon prices.
Sources
- Mori K et al. Phytother Res. 2009;23(3):367-72. PubMed 18844328
- Nagano M et al. Biomed Res. 2010;31(4):231-7. PubMed 20834180
- Saitsu Y et al. Biomed Res. 2019;40(4):125-131. PubMed 31413233
- Li IC et al. Front Aging Neurosci. 2020;12:155. PubMed 32581767
- Vigna L et al. Evid Based Complement Alternat Med. 2019;2019:7861297. PubMed 31118969
- Docherty S et al. Nutrients. 2023;15(22):4842. PubMed 38004235
- Grozier CD et al. Int J Exerc Sci. 2022;15(2):1366-1380. PubMed 36582308
- Surendran G et al. Front Nutr. 2025;12:1405796. PubMed 40276537
- La Monica MB et al. Nutrients. 2023;15(24):5018. PubMed 38140277
- Menon A et al. Front Nutr. 2025;12:1641246. PubMed 40959699
- Mori K et al. Biol Pharm Bull. 2008;31(9):1727-32. PubMed 18758067
- Mori K et al. Phytomedicine. 2010;17(14):1082-5. PubMed 20637576
- Nakatsugawa M et al. Intern Med. 2003;42(12):1219-22. PubMed 14714963
- McCleary BV, Draga A. J AOAC Int. 2016;99(2):364-73. PubMed 26957216
- Testing lists: NSF/ANSI 173, NSF Certified for Sport, Informed Choice and Informed Sport, read October 6, 2026; USP Verified from our copy of September 22, 2026. Labels: each brand’s page or the NIH Dietary Supplement Label Database. Prices: each brand’s own list price, checked October 6, 2026.
This page is for information. It is not medical advice.