Lion's Mane
Lion's mane (Hericium erinaceus) is an edible mushroom with long white spines. Two families of its compounds, hericenones in the fruiting body and erinacines in the mycelium, stimulate nerve growth factor synthesis in cultured cells and rodents. The human evidence is a few small trials, and the most cited one is from 2009.
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What It Does
Hericenones were isolated from the fruiting body in 1991 and erinacines from the mycelium in 1994, both identified by their ability to increase nerve growth factor synthesis in cultured cells (Kawagishi 1991, Kawagishi 1994). Rodent studies show protective effects in models of nerve injury and cognitive decline. Whether these compounds reach the human brain at meaningful levels after a supplement dose is unknown.
The human trials are small. In 2009, 30 Japanese adults aged 50-80 with mild cognitive impairment took 3 g a day of fruiting body powder or placebo for 16 weeks; cognitive scores improved in the mushroom group and fell back four weeks after stopping (Mori 2009). In 49 people with mild Alzheimer's disease, about 1 g a day of erinacine A-enriched mycelium for 49 weeks produced better scores than placebo on some cognitive and daily-living measures (Li 2020). In 41 healthy young adults, 1.8 g a day for 28 days sped performance on one task after the first dose but did not improve cognition over the month (Docherty 2023). No larger trial has replicated the 2009 result.
Forms and Bioavailability
Absorption ratings are broad tiers. Head-to-head human trials rarely support a finer ranking among well-absorbed forms.
| Form | Absorption | Typical dose | Cost | Labels |
|---|---|---|---|---|
| Fruiting Body Extracthot water extract, dual extract | VariableHot water (and sometimes alcohol) extraction of the mushroom itself concentrates beta-glucans and hericenones. Usually standardized to beta-glucan content. | 500-1,000 mg daily | Moderate | 92 |
| Whole Fruiting Body Powderdried lion's mane | VariableDried, ground mushroom; the preparation used in the 2009 Japanese trial at 3 g daily. | 1-3 g daily | Low | |
| Mycelium on Grainmyceliated grain, full spectrum mycelium | VariableFungus grown on rice or oats and sold with the substrate, so much of the powder can be grain starch. Erinacine content varies with strain and culture. | Per product | Low |
Labels column: number of labels named as lion's mane products that list this form. A product can list more than one form, and some labels do not state a form at all.
The fruiting body is the mushroom itself and contains hericenones and beta-glucans. Mycelium is the root-like network; erinacines are concentrated there. Much commercial "mycelium" is grown on rice or oats and sold with the grain, so a large share of the powder can be starch. The erinacine A-enriched mycelium used in the Alzheimer's trial was a specifically cultured product, not generic myceliated grain.
Typical Dosing
Human trials used 1-3 g daily of fruiting body powder or about 1 g of erinacine A-enriched mycelium, for periods from 4 to 49 weeks.
Food sources: fresh or dried lion's mane mushroom.
What to Look For
For fruiting body products, look for grams per serving close to the trial range and a stated beta-glucan percentage. A product that reports high alpha-glucan or starch content is likely padded with grain. Mycelium products are only worth considering if they state erinacine A content.
Lion's mane is a food and is generally well tolerated. Stop it if a rash or breathing symptoms appear, and avoid it with a known mushroom allergy.
Red flags: "nootropic" stacks with ten mushrooms at 100 mg each, and products that do not say whether they contain fruiting body or mycelium. Green flags: the part of the mushroom named, beta-glucan or erinacine content stated, and third-party testing.
Whole Fruiting Body Powder
Closest to the 2009 trial, and to the mushroom as food.
What to look for: 100% fruiting body powder, 1-3 g daily.
Find on iHerb Affiliate linkFruiting Body Extract
Concentrated and measurable, though the extraction removes some compounds and keeps others.
What to look for: Fruiting body extract with beta-glucan percentage stated, 500-1,000 mg daily.
Find on iHerb Affiliate linkMycelium on Grain
Usually more grain than mushroom. Erinacine A-enriched products are the exception.
What to look for: Only products that state erinacine A content per serving.
Find on iHerb Affiliate linkProducts on Titrate
497 of the 214,745 labels in the NIH Dietary Supplement Label Database list lion's mane as an active ingredient (370 on market). 169 are sold as lion's mane products by name.
Top on-market labels, ranked by label completeness and simplicity:
Lion's Mane does not have its own search category yet. Each product above links to its full label in the NIH database.
Related Tools
References
Kawagishi H, Ando M, Sakamoto H, et al. Hericenones C, D and E, stimulators of nerve growth factor (NGF)-synthesis, from the mushroom Hericium erinaceum. Tetrahedron Lett. 1991;32(35):4561-4564.
Kawagishi H, Shimada A, Shirai R, et al. Erinacines A, B and C, strong stimulators of nerve growth factor (NGF)-synthesis, from the mycelia of Hericium erinaceum. Tetrahedron Lett. 1994;35(10):1569-1572.
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.
Li IC, Chang HH, Lin CH, et al. Prevention of early Alzheimer's disease by erinacine A-enriched Hericium erinaceus mycelia pilot double-blind placebo-controlled study. Front Aging Neurosci. 2020;12:155.
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.
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