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newest 2026spec sheet11 rows
Erinacine P is a cyathane diterpenoid isolated from liquid cultures of Hericium erinaceus and is best understood as a biosynthetic precursor within the erinacine pathway that leads to erinacine A and erinacine C. Despite its precursor role it is itself neuroactive, promoting neurite outgrowth in PC12 cells at low micromolar concentrations. It is of particular interest to metabolic engineers seeking to raise erinacine A yields, since the pathway flows through erinacine P.
- Promotes neurite outgrowth in neuronal cell models
- Serves as biosynthetic precursor to erinacine A and C
- Contributes to the neurotrophic activity of mycelium extracts
- Key target for fermentation yield engineering
Overview
Erinacine P is a member of the cyathane diterpenoid series produced by Hericium erinaceus, reported from liquid mycelial cultures alongside erinacine A and the newer erinacines T, U and V. In a study evaluating these compounds on the rat PC12 pheochromocytoma cell line, erinacine P produced pronounced neurite-outgrowth promotion in the 2.5 to 10 micromolar range, placing it among the neuroactive erinacines rather than being merely a silent intermediate [1].
Its principal significance is biosynthetic. Erinacine P sits upstream in the pathway that converts early cyathane skeletons into the pharmacologically prized erinacine A and erinacine C, and reviews of erinacine A production identify it as a key precursor whose conversion steps are targets for fermentation optimization and pathway engineering [2]. Mapping this route is central to solving the yield bottleneck that limits erinacine A supply [2][3].
Because it is both a functional neurotrophic diterpenoid and a metabolic waypoint, erinacine P is valued more as a mechanistic and process-chemistry lead than as a consumer ingredient. Evidence is entirely preclinical and centers on cell-based neurite-outgrowth assays and structural or biosynthetic characterization [1][3].
- Erinacine P is a stepping-stone that the mushroom converts into the more famous erinacine A, so raising its flux is one strategy to boost erinacine A yields.
- Even as a precursor, it promotes neurite outgrowth in nerve cells on its own.
Mechanism
Erinacine P is a cyathane diterpenoid that promotes neurite outgrowth in neuronal cell models, consistent with the neurotrophic activity of the erinacine class, which is driven by induction of nerve growth factor and downstream Trk-linked survival and differentiation signaling. Within Hericium erinaceus it also serves as a biosynthetic precursor that is enzymatically converted toward erinacine A and erinacine C.
receptor fingerprint
Erinacine biosynthetic pathwayServes as precursor to erinacine A and C
Neurite outgrowth (PC12 cells)Promotes outgrowth at low micromolar concentration
Nerve growth factor signalingClass-level NGF-linked neurotrophic activity
Dosingtypical ranges, not medical advice
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Safetyrisks and cautions, not medical advice
As a minor mycelial constituent consumed within Lion's Mane preparations, erinacine P has no specific safety concerns reported, but there is no dedicated human toxicology, and the purified compound is research-grade with no established dosing. Its use outside laboratory settings is not characterized.
History
Erinacine P was described during structural studies of Hericium erinaceus culture metabolites and was reported together with erinacines T to V in a 2018 investigation of neurotrophic cyathane diterpenes. Its role as a precursor to erinacine A was clarified as the biosynthetic pathway of the erinacines was elucidated and reviewed through the 2020s.
Reputation
Erinacine P is a niche compound known mainly to natural-product chemists and fermentation researchers as the gateway precursor to erinacine A. It carries little consumer profile but is scientifically important for understanding and scaling erinacine biosynthesis.
Subjective profileweighing the evidence above
Mostly of interest to people engineering Lion's Mane fermentation yields. It nudges neurite growth in cell models, but it occurs as a minor mycelial constituent with no human data and no established dose. Erinacine A is the one worth following in this family.
Resources
This entry is here for reference.
Research
- 2018first citedThree new cyathane diterpenes with neurotrophic activity from the liquid cultures of Hericium e…
- 2026most recentRecent Advances in Erinacine A: Preparation, Biological Activities, and Biosynthetic Pathway
- 1.Three new cyathane diterpenes with neurotrophic activity from the liquid cultures of Hericium erinaceus
- 2.Recent Advances in Erinacine A: Preparation, Biological Activities, and Biosynthetic Pathway
- 3.Two New Cyathane Diterpenoids from Mycelial Cultures of the Medicinal Mushroom Hericium erinaceus and the Rare Species Hericium flagellum
3 listed here; entry last updated August 2026
Reviews
My notesprivate to this device
FAQ
Is erinacine P active or just a precursor?
Both. It promotes neurite outgrowth in nerve cells while also being converted by the mushroom into erinacine A and erinacine C.
Why do researchers care about it?
Because the biosynthetic route to the valuable erinacine A runs through erinacine P, so understanding it helps engineers raise erinacine A production.
Can I buy erinacine P?
No, it is a research chemical and a minor constituent of Lion's Mane mycelium, not a standalone supplement.
Does erinacine P cross the blood brain barrier?
Direct data are lacking, but as a small cyathane diterpenoid it is structurally similar to the centrally active erinacine A.
What pairs well with it?
In practice it is only encountered inside whole Lion's Mane mycelium, which pairs well with cholinergic precursors and other neurotrophic mushroom extracts.
Limitations of the evidence
- No human safety or efficacy data
Notes and cautions
- Research-grade only, no established dosing
- Present at low and variable levels in products