Lion's mane has not been shown to improve memory in a way you can count on. The best-known human trial, in 30 older adults in Japan with mild cognitive impairment, found better scores on 3 g a day for 16 weeks. A small 2025 trial in 18 adults found no significant overall effect on cognition or mood. Most of the encouraging work is in lab and animal studies, so it is still an open question.
Disclosure: this site and Pilly Labs are under common ownership.
Does lion's mane actually improve memory?
Here is what human research has found. Lion's mane (Hericium erinaceus, called Yamabushitake in Japan) has only a handful of small trials behind it.
| Study | Who | What they took | What was reported |
|---|---|---|---|
| Mori et al., 2009 | 30 Japanese men and women aged 50 to 80 with mild cognitive impairment | 3 g a day of powdered fruiting body (1 g three times daily) for 16 weeks | Better cognitive scores than placebo at weeks 8, 12 and 16. Scores fell again 4 weeks after the mushroom was stopped. |
| 2025 acute study | 18 adults | 3 g of a 10:1 fruiting body extract | No significant overall effect on cognition or mood, with one isolated task signal. |
| Nagano et al., 2010 (as summarised by a supplement maker's blog) | 30 women with various complaints | Lion's mane cookies daily for 4 weeks | Lower reported anxiety and irritation than placebo. Memory was not the outcome. |
| Saitsu et al., 2023 (same blog's summary) | Healthy young adults | Short course of supplements | Quicker reaction times and mental clarity reported. The blog calls it small. |
What this adds up to:
- The one positive memory-related trial was small, enrolled people with mild cognitive impairment, and ran 16 weeks. That does not tell you what happens in people with ordinary forgetfulness.
- The newer study in healthy adults did not find a clear overall effect.
- The nerve growth factor explanation you often see (compounds called hericenones and erinacines) rests mainly on preclinical work. A supplement-maker's own article says much of the mechanism comes from preclinical studies. A home-care provider's article describes the memory results as coming from mice and says larger human trials are needed.
For the lab side of the story, see our page on lion's mane and nerve growth factor. For how to weigh small early studies, see what preliminary findings mean.
How much lion's mane is used for memory?
No dose has been established for memory. The doses used in the human studies above were large and in gram quantities:
- 3 g a day of powdered fruiting body, split into three 1 g doses, for 16 weeks (the older-adult trial).
- A single 3 g dose of 10:1 fruiting body extract (the 2025 acute study).
Retail products work very differently. A home-care article notes that lion's mane doses are not standardized across products, so form and strength vary. Powder, extract and mycelium are not interchangeable, and a number on a label means little without knowing which form it is.
What some labels actually list
If you are comparing options, an example label helps. The Pilly Labs Adaptogen Vitality Gummies are one such label. Below is what Pilly Labs discloses for its lion's mane products. This is label information only, not evidence that any of them affects memory.
| Product | Lion's mane disclosure | Limit to know |
|---|---|---|
| Adaptogen Vitality Gummies (1 gummy, 30 servings) | Pilly Labs' internal record lists 87 mg each of Lion's Mane, Chaga, Shiitake and Maitake (348 mg total) | The live product page names Lion's Mane, Reishi and Cordyceps and says amounts are being reverified. Pilly Labs says the physical bottle controls. |
| Mushroom Energy & Cognition Drops (1 mL, 30 servings) | Lion's Mane 100 mg, listed with B12, Cordyceps, Alpha GPC and L-Tyrosine | Multi-ingredient formula |
| 10-Mushroom Gummies (2 gummies, 30 servings) | Lion's Mane is one of ten species in a 250 mg combined fruiting body 10:1 extract blend | The per-species amount is not disclosed, so the lion's mane share cannot be worked out. |
Even the highest single amount above, 100 mg, is a small fraction of the 3 g used in the trials, and the forms differ. Ingredient research is not proof that a finished product does anything. Our guide to ingredient evidence versus marketing claims explains how to compare the two.
Is it safe to take lion's mane every day?
Human trials have run for weeks, not years, and the longest one described here lasted 16 weeks. Longer daily use has less behind it.
- Common reports: A supplement maker's article lists mild digestive upset such as bloating or nausea, and rare skin irritation or allergic reactions.
- Allergy signs: The home-care article lists breathing difficulty, rashes, stomach discomfort, nausea and diarrhea as reasons to stop and call a clinician.
- Blood sugar and clotting: The same article says lion's mane may lower blood sugar and slow blood clotting, and advises talking to a doctor first if you have diabetes or take blood thinners.
- Individual response: One forum poster reported worse concentration and poor sleep after starting a liquid extract, and both settled after stopping. That is a single anecdote, but it shows people react differently.
Who may want to ask a clinician first
Pilly Labs' own safety notices say these groups should ask a healthcare professional before using its mushroom products:
- Anyone taking blood thinners, anticoagulants or blood-sugar medication.
- Anyone pregnant or nursing, under 18, or with a known mushroom or mold allergy.
- Anyone with a medical condition, on other medication, or with surgery scheduled. Its legal notice says to discontinue use at least two weeks before surgery.
- Anyone with autoimmune conditions or an organ transplant, because of the immune effects it describes for mushroom beta-glucans.
If you take any prescription, a pharmacist or doctor can check it against the exact label of what you plan to buy.
What is the best supplement for brain memory?
No single supplement is established as best. A few points that matter when you are comparing:
- Ginkgo: The NCCIH ginkgo summary says no conclusive evidence supports its use for a health condition, and it raises bleeding and drug-interaction concerns.
- Vitamin B12: The NIH Office of Dietary Supplements B12 fact sheet treats B12 as essential, so deficiency matters. Supplementing does not automatically raise energy or sharpness in people who are not deficient.
- Other options: Our pages on Bacopa monnieri research and the cholinergic system cover other ingredients, and natural ways to improve memory covers foods and habits.
A person who feels foggy may have causes unrelated to supplements. Our sleep and memory record helps you gather notes for a clinician. If your memory is getting worse, why memory gets worse and when to worry explains the signs worth raising.
What about Mayo Clinic, neurologists, Japan and “cut dementia 40 percent” claims?
- Japan: The best-known human lion's mane memory trial was run in Japan with Japanese adults aged 50 to 80 who had mild cognitive impairment. That tells you where one study took place, not what people in Japan generally use for memory loss.
- Mayo Clinic and neurologists: This page cannot speak for what either recommends for you. Memory loss has many possible causes, so your own clinician is the person to ask, ideally with a few weeks of notes on sleep, medicines and what you forget.
- A vitamin that cuts dementia by 40 percent, or three foods to avoid: Nothing in lion's mane research supports a figure like that, and no supplement discussed here is shown to prevent dementia. When you see a precise percentage, find the original study and check who was studied, for how long, and whether it was a trial or an observation.
Before you order
- Check whether the label says fruiting body, mycelium or powder, and the amount per serving.
- Check whether lion's mane has its own listed amount or sits inside a blend with undisclosed per-species amounts.
- Check added sugar if you are comparing gummies with drops or capsules. Pilly Labs' records list 2 g of added sugar per Adaptogen Vitality Gummy and 5 g per two Mushroom Gummies.
- If a product page and the bottle differ, Pilly Labs says the physical label controls. Email info@pillylabs.com before buying if an amount matters to you. Its refund policy allows a satisfaction request within 30 days of delivery, one refund per product per customer.
- Ask your clinician or pharmacist first if you take blood thinners or blood-sugar medication, are pregnant or nursing, or have an allergy or upcoming surgery.
By GlobalMHSummit.com Research Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.