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Compound

Ergothioneine (Extra)

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Ergothioneine (Extra). Unique thiol antioxidant concentrated in mitochondria via OCTN1.

How it works. Selective transport into oxidatively stressed cells; scavenges hydroxyl radicals.

What the research supports. 1 graded claims. Strongest: Inverse association with cognitive decline (limited).

How much to take. Typical dose: 5–25 mg.

Side effects and interactions. 1 medication interaction listed. Serious: Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing.

Stacking. Pairs well with NAD+ precursor (NMN or NR), Omega-3, Omega-3 (EPA/DHA).

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Ergothioneine (Extra). Anecdotes are not medical advice.

Ergothioneine (Extra). Unique thiol antioxidant concentrated in mitochondria via OCTN1.

Molecular structureC9H15N3O2S · 229.30 g/mol

What it is

Unique thiol antioxidant concentrated in mitochondria via OCTN1.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

Goals

Healthy AgingBrain & Cognitive

How it works

Selective transport into oxidatively stressed cells; scavenges hydroxyl radicals.

Pathways

  • Selective transport into oxidatively stressed cells
  • scavenges hydroxyl radicals

Effects

  • +Inverse association with cognitive decline supports

What the research supports

Inverse association with cognitive declinelimited

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
5–25 mg
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodEither
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • Ergothioneine (Extra) is generally well-tolerated at evidence-based doses
  • Mild GI discomfort (nausea, loose stools, or bloating) possible at higher intakes
  • Headache or transient fatigue reported by a small fraction of users

Serious

  • Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing

Medication interactions

Prescription medications (general)minor

Always disclose Ergothioneine (Extra) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • NAD+ precursor (NMN or NR)Complementary mitochondrial and sirtuin support.
  • Omega-3Lowers inflammation and supports membrane integrity.
  • Omega-3 (EPA/DHA)Membrane fluidity and neuronal signaling support.

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

PubMed: Ergothioneine (Extra) — Inverse association with cognitive decline ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Ergothioneine (Extra) and "Inverse association with cognitive decline". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Ergothioneine (Extra) — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Ergothioneine (Extra) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Ergothioneine (Extra) — meta-analysis ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Ergothioneine (Extra) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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