Quick answer
Studies of lion's mane used between 1 g and 10 g a day. Two trials of plain fruiting body powder found slightly higher memory and thinking scores in adults over 50, at about 3 g a day for 12 to 16 weeks. No upper limit has been set.1,2,3,4
Key facts
- The 16-week trial gave four 250 mg tablets three times a day, about 3 g in all.1
- In college-age adults, 10 g a day for 4 weeks, baked into muffins, changed no measured result.3
- A 49-week trial used 1.05 g a day of a mycelium enriched in erinacine A, a different material from plain powder.5
- Every trial we read gave weighed amounts. None measured lion's mane by the teaspoon.1,3,6,7
Every amount tested in people
Eight placebo-controlled trials give a daily amount we could check. They are listed from the smallest amount to the largest, with the form used, because a gram of extract and a gram of powder are not the same dose.
| Daily amount | Form | Who, and for how long | What was found |
|---|---|---|---|
| 1 g, once | Fruiting body capsules | 40 adults aged 18 to 50, single dose | Small changes from each person's own baseline at 1 and 2 hours |
| 1.05 g | Mycelium enriched in erinacine A | Older adults under medical care, 49 weeks | Better scores than placebo on some tests |
| 1.8 g | Three 600 mg capsules each morning | 41 adults aged 18 to 45, 28 days | One task faster an hour after the first dose; most tests unchanged |
| 2 g | Fruiting body powder baked into cookies | 30 women, 4 weeks | Two items on a complaints questionnaire lower than placebo |
| About 3 g | Fruiting body powder tablets | 30 adults aged 50 to 80, 16 weeks | Higher cognitive scale scores than placebo |
| 3 g, once | 10:1 fruiting body extract | 18 adults aged 18 to 35, single dose | No overall change at 90 minutes |
| 3.2 g | Fruiting body powder | 31 adults over 50, 12 weeks | One of three tests slightly higher than placebo |
| 10 g | Baked into two muffins | 24 college-age adults, 4 weeks | No change in any result |
The amount behind the one graded claim
May support memory and thinking test scores in adults over 50 at about 3 g a day of fruiting body powder; not shown in younger adults*1,2,3,6,8
Early evidence
Two small Japanese trials. In 30 adults aged 50 to 80 whose memory and thinking had been assessed as mildly below normal for their age, about 3 g a day of fruiting body powder for 16 weeks raised scores on a cognitive scale more than placebo at weeks 8, 12 and 16, and the gain faded within 4 weeks of stopping. In 31 adults over 50, 3.2 g a day for 12 weeks gave a slightly higher result than placebo on one screening test and no difference on two others. In younger adults, 10 g a day for 4 weeks changed nothing measured, and single doses of 1 to 3 g gave mixed results.
Amount studied: About 3 to 3.2 g a day of fruiting body powder for 12 to 16 weeks
We found no trial of smaller daily amounts of plain fruiting body powder in adults over 50, so it is not known whether 1 g a day would do the same. More was not better in the one high-dose trial: 10 g a day in young adults changed nothing.1,2,3
Teaspoons, capsules and extracts
If you buy loose powder, weigh it or go by the grams on the label rather than a spoon. The trials handed out set weights as tablets, capsules, cookies, muffins or extract, and a fair comparison with any of them is grams of the same material.1,3,6,7,8
One 49-week trial used three 350 mg capsules a day, 1.05 g in all, of a mycelium enriched in erinacine A, in older adults under medical care for memory loss.5
That mycelium had been grown to be rich in erinacine A, so its 1.05 g cannot be swapped for 1.05 g of ordinary powder. An extract is a third kind of material: the single-dose extract trial used 3 g of a 10:1 fruiting body extract, far more concentrated than 3 g of plain powder.5,8
What's in ours
Two capsules of our Lion's Mane hold 1,000 mg of mixed fruiting body and mycelium powder, about a third of the daily amount given to adults over 50 in the trials, and Mushroom Complex holds 266 mg. At these amounts we make no claim for either.1,2
Upper amounts, children, and who should ask first
No upper limit is set. Trials have used up to 10 g a day for 4 weeks in young adults, and about 3 g a day for 16 weeks in older adults, where laboratory tests showed no adverse effect. NIH's LiverTox rates lion's mane an unlikely cause of liver injury. Daily use beyond a few months has been studied only in older adults under medical care.1,3,5,9
- Children: we found no placebo-controlled trial in children, so ask a doctor before giving lion's mane to anyone under 18
- Pregnancy and breastfeeding: there are no human safety data, so ask your doctor first
- Blood thinners or planned surgery: ask first, because a lion's mane compound slowed platelet clumping in laboratory tests10
- Taking extra capsules to match a study's amount: ask a doctor first, because a different blend has not been tested at that amount
Questions people ask
How much lion's mane per day for memory?
The fruiting body trials that found a difference used about 3 g a day, taken for 12 to 16 weeks by adults over 50. A 49-week trial of a special mycelium used 1.05 g a day in older adults under medical care. The evidence is early, and smaller amounts of plain powder were not tested in adults over 50.1,2,5
See what we make
Every product shows its whole label and what its lab report covers. The store opens soon.
Sources
- 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. Opened 2026-10-07.
- 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. Opened 2026-10-07.
- Grozier CD, Alves VA, Killen LG, Simpson JD, O'Neal EK, Waldman HS. Four weeks of Hericium erinaceus supplementation does not impact markers of metabolic flexibility or cognition. Int J Exerc Sci. 2022;15(2):1366-1380. Opened 2026-10-07.
- La Monica MB, Raub B, Ziegenfuss EJ, et al. Acute effects of naturally occurring guayusa tea and Nordic lion's mane extracts on cognitive performance. Nutrients. 2023;15(24):5018. Opened 2026-10-07.
- 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. Opened 2026-10-07.
- 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. Opened 2026-10-07.
- Nagano M, Shimizu K, Kondo R, et al. Reduction of depression and anxiety by 4 weeks Hericium erinaceus intake. Biomed Res. 2010;31(4):231-237. Opened 2026-10-07.
- Surendran G, Saye J, Binti Mohd Jalil S, et al. Acute effects of a standardised extract of Hericium erinaceus (Lion's Mane mushroom) on cognition and mood in healthy younger adults: a double-blind randomised placebo-controlled study. Front Nutr. 2025;12:1405796. Opened 2026-10-07.
- LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Lion's Mane. Bethesda (MD): National Institute of Diabetes and Digestive and Kidney Diseases. Last update January 5, 2024. Opened 2026-10-01.
- Mori K, Kikuchi H, Obara Y, et al. Inhibitory effect of hericenone B from Hericium erinaceus on collagen-induced platelet aggregation. Phytomedicine. 2010;17(14):1082-1085. Opened 2026-10-07.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.