Does lion's mane help with memory? What the trials tested

Not reliably. In the five human trials of lion’s mane this desk read, older adults with mild cognitive impairment or mild Alzheimer’s disease improved on global screening scales such as the MMSE, but none of the five reported a gain on a memory-specific test, and healthy young adults given 1.8 g recalled fewer words an hour after one dose.

That is the evidence behind “does lion’s mane help with memory”, and it is an evergreen answer: it rests on published trials, not on anything that happened this month. This desk read the five trial reports through PubMed’s E-utilities and PubMed Central on 24 October 2026. Every number below comes from those pages, mostly from abstracts rather than full papers.

Does lion’s mane help with memory in the trials?

The answer depends on who was tested and what “memory” meant on the day. The trials that found something used short screening scales built to flag dementia, which mix recall with orientation, attention and language. The trials that used dedicated memory tasks, word lists and visual recall, reported no gain on them, and in one case something slightly worse.

What memory test did each trial use?

Where do the positive memory claims come from?

From the three older-adult trials. Mori 2009 is the earliest: 15 people on lion’s mane, 15 on placebo, with gains that grew over 16 weeks and then faded. Its lead author’s listed affiliation is Hokuto Corporation’s mushroom laboratory.

Saitsu 2019 is the most useful trial for the memory question, because it gave two memory-specific tests alongside the MMSE: the Benton visual retention test and a verbal paired-associate learning test. Its abstract says the MMSE “alone” showed significant improvement. The abstract gives no dose or sample size; the 3.2 g figure in the table is how Docherty’s paper summarises a 12-week MMSE trial in adults aged 50 and over.

Li 2020 tested a mycelium product enriched in erinacine A, from authors that include Grape King Bio, over 49 weeks. Its MMSE result is real but sits beside a decline in the placebo group on another scale, which is a different finding from improved memory.

What happened to memory in healthy young adults?

This is the part the supplement aisle leaves out. In Docherty 2023, run at Northumbria University with Sempera Organics’ SO-DSX1 capsules, participants on lion’s mane recalled fewer correct words at the test one hour after their first dose (p = 0.013), while the placebo group made fewer recall errors. After 28 days, it was the placebo group that recalled significantly more words on delayed recall than on Day 1. The episodic memory factor showed no difference between treatments. The one benefit was speed: a quicker Stroop task an hour after dosing (p = 0.005).

The authors describe “null and limited negative findings” in a small pilot, and that framing matters. This is not proof that lion’s mane harms memory. It is proof that the one healthy-adult trial here to run word-recall tests over 28 days did not find it helped.

Surendran 2025, from the University of Surrey with authors affiliated with Beyond Alcohol Ltd and Clasado Ltd, gave 18 adults a 3 g extract and found no effect on composite cognition at 90 minutes; only the pegboard test, a motor task, improved. A 10 g-a-day muffin trial in college athletes, known to us only through Docherty’s introduction, found no effect on a dual-task challenge of Stroop, mental arithmetic and balance.

For every outcome the trials measured, not just memory, see what lion’s mane is good for. For onset, see how long lion’s mane takes to work.

Questions readers ask

Does lion’s mane actually improve memory?

Not on the evidence this desk read. Older adults with mild cognitive impairment or mild Alzheimer’s disease improved on global screening scales, the HDS-R and the MMSE. But none of the five trials reported a gain on a dedicated memory test, and in the one 28-day trial of healthy young adults, the placebo group was the one whose delayed word recall improved.

How long does it take for lion’s mane to work for memory?

Mori 2009, which compared scores at weeks 8, 12 and 16, first reported a difference from placebo at week 8, on a screening scale, in older adults with mild cognitive impairment. Saitsu ran 12 weeks and Li 49 weeks. In healthy young adults, neither one dose nor 28 days produced a better memory score, so there is no timeline to quote for them.

Is lion’s mane good for memory loss?

Three small trials in people with diagnosed impairment point in a hopeful direction: higher HDS-R scores in mild cognitive impairment, and higher MMSE scores after 12 and 49 weeks. Each tested one product, two of them with manufacturer-affiliated authors, and none used a dedicated memory test as its headline result. That is a reason for larger trials, not a treatment for memory loss.

What are the side effects of lion’s mane?

The memory trials say little on this. Mori 2009 reports that laboratory tests showed no adverse effect over 16 weeks, and the Saitsu authors call oral intake safe, which is their conclusion rather than a measured outcome in the abstract. For what the human trials recorded on safety, see our separate lion’s mane safety post.

Where this leaves the label-reader

A tub that says “supports memory” is leaning on screening-scale results in older adults with diagnosed impairment, from single products, often with the maker’s scientists on the paper. If a label makes the claim, ask which trial, which test, and in whom. None of this is medical advice. Lion’s mane is sold as an adult supplement not intended to diagnose, treat, cure or prevent any disease, and anyone with memory concerns should see a clinician rather than a supplement shelf.