Overview
Unique thiol antioxidant concentrated in mitochondria via OCTN1.
- Endogenously produced or biosynthesized molecule
- Standardized pharmaceutical- or food-grade supplement
- Combined with cofactors that improve absorption or activity
- Capsule or softgel
- Powder
- Sublingual or buccal
- Liposomal liquid
Forms & variants of Ergothioneine
Different chemical forms of Ergothioneine behave differently. Browse each form's mechanism, bioavailability, and best-use context.
Mechanism of action
Selective transport into oxidatively stressed cells; scavenges hydroxyl radicals.
- · Selective transport into oxidatively stressed cells
- · scavenges hydroxyl radicals
Effects on the body
Organ system effects
Ergothioneine (Extra) acts on hallmarks of aging including oxidative stress, mitochondrial dysfunction, and senescence signaling.
Evidence-based benefits
Inverse association with cognitive decline
Limited evidencePotential 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
- · Allergic or hypersensitivity reaction (rash, itching, swelling)
- · Sleep disturbance if taken late in the day
- · Discontinue and seek medical advice if symptoms are severe, persistent, or include difficulty breathing
Drug interactions
Supplement interactions
- 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.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified Ergothioneine (Extra) — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Ergothioneine (Extra) third party tested NSF
CapsulesPre-measured Ergothioneine (Extra) capsules — easiest for travel and consistent daily dosing without scoops or scales.Ergothioneine (Extra) capsules
PowderBulk unflavored Ergothioneine (Extra) powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Ergothioneine (Extra) powder unflavored
Best sellersMost-purchased Ergothioneine (Extra) products on Amazon — a quick way to see what's reviewed widely before you commit.Ergothioneine (Extra) best sellerScientific evidence8Show studiesHide studies
Ergothioneine and frailty
Beelman RB, et al.
Observational study in elderly.
Low ergothioneine correlated with frailty and cognitive decline.
PubMed: Ergothioneine (Extra) — Inverse association with cognitive decline
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PubMed: Ergothioneine (Extra) — randomized controlled trial
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PubMed: Ergothioneine (Extra) — meta-analysis
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PubMed: Ergothioneine (Extra) — dose response
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Google Scholar: Ergothioneine (Extra) — clinical evidence
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