Are lions mane mushrooms psychedelic?

Quick answer: lion’s mane is not psychedelic

Lion’s mane (Hericium erinaceus) does not contain psilocybin or other classic psychedelic compounds, and it does not produce hallucinations or altered states of consciousness.

“Psychedelic” effects are closely tied to activation of the brain’s 5-HT₂A serotonin receptors by substances such as psilocybin or LSD. Human PET imaging shows psychedelic intensity correlates with 5-HT₂A receptor occupancy and plasma psilocin levels.

Bottom line: lion’s mane does not activate this system.

Evidence:
Neuropsychopharmacology (2019):
Frontiers in Pharmacology (2021 review):

What makes a mushroom “psychedelic” (and why lion’s mane doesn’t qualify)

Classic psychedelic mushrooms contain psilocybin, which the body converts into psilocin, a direct 5-HT₂A agonist responsible for psychedelic effects.

Lion’s mane does not contain psilocybin or any related tryptamine, ergoline, or phenethylamine compounds linked to psychedelic activity.

Instead, research focuses on its neurotrophic and antioxidant actions, not on serotonergic hallucinations.

Evidence:
Frontiers in Pharmacology (2021 review):
Neuropsychopharmacology (2019):

What’s in lion’s mane instead? Hericenones and erinacines (non-psychedelic)

Lion’s mane contains two main groups of bioactives:

Hericenones (fruiting body)
Erinacines (mycelium)

In lab and animal studies, these compounds:

stimulate nerve growth factor (NGF)
support neurite outgrowth
modulate NGF/BDNF signalling
show anti-inflammatory actions

These mechanisms relate to neuroprotection, not psychedelic effects.

Evidence:
International Journal of Molecular Sciences (2023 review)
Biological & Pharmaceutical Bulletin (2008)

Evidence without a “trip”: what human studies suggest

Small human trials show potential cognitive or mood benefits — but zero psychedelic effects.

One randomized placebo-controlled trial in older adults with mild cognitive impairment found that 16 weeks of lion’s mane improved test scores. The benefits faded after stopping the supplement.

Importantly, no hallucinations or psychedelic symptoms were reported.

Evidence:
Phytotherapy Research (2009)
Review

UK context: psychedelics law vs. lion’s mane supplements

In the UK:

Psilocybin is a Class A, Schedule 1 controlled drug.
Home Office list
Lion’s mane is a legal edible mushroom and widely sold as a food supplement.

If a product is formally registered as a traditional herbal medicine under the MHRA THR scheme, it may carry traditional-use wording.
Otherwise, supplements must not claim to treat or prevent disease.

Guidance:
MHRA THR scheme
Food supplements rules

Safety notes (non-psychedelic does not mean risk-free)

Lion’s mane is generally well-tolerated. Mild digestive upset is sometimes reported.

One study suggests hericenone B may inhibit collagen-induced platelet aggregation, so caution is advised if you’re taking anticoagulant or antiplatelet medication.

Consult a healthcare professional before starting any supplement.

Evidence:
Journal of Agricultural and Food Chemistry (2010)