Overview
Unique antioxidant from mushrooms with its own transporter — accumulates in oxidative-stress tissues.
- 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
Specific transporter (OCTN1) concentrates it in liver, kidney, RBCs, brain; potent ROS scavenger.
- · Specific transporter (OCTN1) concentrates it in liver, kidney, RBCs, brain
- · potent ROS scavenger
Effects on the body
Organ system effects
Evidence-based benefits
Lower blood levels associate with cognitive decline
Limited evidencePotential side effects
- · Ergothioneine 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
- A high-quality multivitaminCovers micronutrient cofactors that support most supplement pathways.
- Omega-3 (EPA/DHA)Foundational anti-inflammatory support that complements most regimens.
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 — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Ergothioneine third party tested NSF
CapsulesPre-measured Ergothioneine capsules — easiest for travel and consistent daily dosing without scoops or scales.Ergothioneine capsules
PowderBulk unflavored Ergothioneine powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Ergothioneine powder unflavored
Best sellersMost-purchased Ergothioneine products on Amazon — a quick way to see what's reviewed widely before you commit.Ergothioneine best sellerScientific evidence8Show studiesHide studies
Ergothioneine status and cognitive decline
Cheah IK, et al.
Cohort study of plasma ergothioneine in older adults.
Lower levels associated with cognitive impairment and frailty.
PubMed: Ergothioneine — Lower blood levels associate with cognitive decline
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PubMed: Ergothioneine — randomized controlled trial
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PubMed: Ergothioneine — meta-analysis
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PubMed: Ergothioneine — pharmacokinetics
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PubMed: Ergothioneine — safety adverse events
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PubMed: Ergothioneine — dose response
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Google Scholar: Ergothioneine — clinical evidence
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Cross-database citation index for Ergothioneine as it relates to "clinical evidence".
Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.