11 May 2026 3 min read nootropik

Erinacines: Key Bioactive Compounds and Their Functions in Lion’s Mane Mycelium

Erinacine ranks among the scarce fungal metabolites confirmed to traverse the blood–brain barrier.

MycoVita Audio Story

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— THE HOOK —

Lion's Mane contains two families of NGF-stimulating compounds. Hericenon resides in the fruiting body. So what does the mycelium hold?

Answer: Erinacin.

Discovered in 1994, a second compound family built on a different chemical scaffold from Hericenon yet aimed at the same target — NGF synthesis. And according to some researchers, more potent than Hericenon in NGF stimulation.

— WHAT IS ERINACIN? —

Erinacin is a family of diterpenoids isolated from Hericium erinaceus mycelium. It was characterized by Kawagishi and colleagues in 1994 — three years after the discovery of Hericenon.

To date, multiple variants from Erinacin A through I have been identified. Among these, Erinacin A has been reported as the most potent NGF stimulator.

Reference: Kawagishi, H. et al. (1994). Erinacines A, B and C, strong stimulators of nerve growth factor synthesis, from the mushroom Hericium erinaceus. Tetrahedron Letters, 35(10).

— MECHANISM —

Erinacin operates through a mechanism similar to but distinct from that of Hericenon.

Both compounds stimulate astrocytes to trigger endogenous NGF production. However, Erinacin's chemical structure is built upon a cyathane diterpenoid skeleton — a scaffold that differs from the one underlying Hericenon.

In comparative in vitro studies, Erinacin A has been reported to stimulate NGF synthesis at lower concentrations than Hericenon C. This suggests Erinacin may be more potent on a per-gram basis.

However: This is in vitro data. Within the human body, factors such as bioavailability, metabolism, and blood-brain barrier penetration enter the equation. Which compound proves more effective in a clinical setting has not yet been determined.

— ERINACIN vs. HERICENON —

Source: Erinacin → mycelium. Hericenon → fruiting body.

Chemical structure: Erinacin → cyathane diterpenoid. Hericenon → distinct diterpenoid skeleton.

NGF potency (in vitro): Erinacin A > Hericenon C (active at lower concentrations)

Clinical data: Limited for both. The Mori (2009) study used whole fruiting body — meaning a Hericenon-containing formulation.

Bioavailability: Both are lipophilic (fat-soluble). Absorption may be enhanced with a lipid-containing carrier.

— THE FRUITING BODY vs. MYCELIUM DEBATE —

This compound-level distinction feeds into one of the largest controversies in the mushroom powder industry: fruiting body or mycelium?

Mycelium advocates point to Erinacin's potency. Fruiting body proponents emphasize not only Hericenon but also the broader diversity of bioactive compounds — beta-glucan, ergothioneine, and others.

The MYCOVITA approach: 100% fruiting body. The reason is not that Erinacin is weak — it is that the fruiting body offers a wider spectrum of constituents, and most mycelium-based products on the market are contaminated with grain substrate.

An honest note: In an ideal world, a product containing both Hericenon and Erinacin would offer the most comprehensive profile. Yet most mycelium products on the market are not pure mycelium — they are mycelium-on-grain mixtures — and the actual Erinacin concentration in such mixtures is rarely quantified.

— THE RESEARCH —

Kawagishi, H. et al. (1994): The first study demonstrating that Erinacines A, B, and C strongly stimulate NGF synthesis.

Lee, K.F. et al. (2014): A study showing neuroprotective effects of Erinacin A in animal models. A protective effect was reported in an ischemic brain injury model.

Li, I.C. et al. (2018): A pilot study examining the effect of Hericium erinaceus mycelium supplementation on cognitive function in patients with mild Alzheimer's disease.

Candid assessment: Erinacin research is newer and less extensive than Hericenon research. Large-scale human clinical trials are not yet available. Promising, but early-stage.

You May Also Be Interested In

→ What Is Hericenon? — The Fruiting Body's NGF Compound

→ What Is NGF? — Nerve Growth Factor

→ MIND | Lion's Mane — Species Encyclopedia

→ Mycelium vs. Fruiting Body — What Is the Difference?

→ The Brain-Gut Axis and Lion's Mane

A structured content cluster on the Lion's Mane neurotrophic pathway: