ResearchSafe

Ergothioneine (L-Ergothioneine)

Category: Detox & Antioxidant. Status: OTC supplement.

A rare sulfur-containing amino acid derived from mushrooms and certain bacteria, dubbed "the longevity vitamin." The body has a dedicated transporter (OCTN1) that concentrates it in tissues under oxidative stress, and low levels correlate with age-related disease.

How it works

Accumulates via the OCTN1 transporter in mitochondria and other high-stress cellular compartments, where it scavenges reactive oxygen species, chelates metals, protects DNA and mitochondria, and preserves other antioxidants.

Key facts

  • Molecular weight: 229.30 Da
  • Half-life: Very long (weeks; retained in tissue)
  • Bioavailability: Good oral via OCTN1 transporter
  • Storage: Room temperature, protect from light.

Dosing overview

  • Typical dose: 5-25 mg per day
  • Frequency: Once daily
  • Duration: Ongoing
  • Route: Oral capsule

Protocol notes

  • General longevity use: 5-10 mg/day.
  • Higher intakes (up to ~25-30 mg/day) have been studied and well tolerated.
  • Because it is retained in tissues, daily dosing steadily raises body stores.

Reported benefits

  • Potent cellular and mitochondrial antioxidant
  • Long tissue retention
  • DNA and lipid protection
  • Neuroprotective potential
  • Associated with lower age-related disease risk
  • Anti-inflammatory

Possible side effects

  • No established side effects
  • Considered very well tolerated

Research

  • Ergothioneine as a longevity vitamin (2020): Proposed as a diet-derived compound whose deficiency is linked to increased risk of age-related chronic disease.
  • Low ergothioneine predicts cardiovascular risk (2019): Higher plasma ergothioneine was associated with lower cardiovascular and all-cause mortality in a large cohort.

Community reviews of Ergothioneine

Rated 4.6 out of 5 from 5 community reviews by ResearchSafe members.

  • bio_optimal rated it 5/5 - Solid compound with real results: Been using Ergothioneine for about 3 weeks and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • growth_factor_gabe rated it 5/5 - Consistent improvement over 3 weeks: Added Ergothioneine to my protocol about 3 weeks ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • injection_journal rated it 4/5 - Genuinely effective after 2 months: Been using Ergothioneine for about 2 months and the results are clear. Not overnight dramatic, but a steady, consistent improvement that became undeniable by the end of the first month. The mechanism makes sense based on what I have read in the literature, and my subjective experience matches the expected timeline. Benefits built gradually and plateaued at a good level. Side effects were minimal to none at the dose I used. Followed proper protocols for sourcing, storage, and administration. Would recommend to others who have done their research and have realistic expectations.
  • lab_notes_tom rated it 5/5 - Noticed clear benefits within weeks: Added Ergothioneine to my protocol about 6 months ago and it has earned its place. The benefits became noticeable around week 2-3 and have been consistent since. What I appreciate about this compound is the predictability. It does what the research suggests it should do, at roughly the timeline you would expect. No surprises, no dramatic swings, just steady improvement. No notable side effects to report at my dose. Sourcing is always the challenge with research compounds, insist on third-party testing. Storage and reconstitution per standard protocols. Plan to continue.
  • bloodwork_brett rated it 4/5 - Worth adding to the protocol: Ergothioneine has been a worthwhile addition. I am data-driven and tracked relevant markers before, during, and after. The improvement is measurable and correlates with the intervention timeline. What sets this apart from some compounds I have tried is the consistency. Benefits did not fluctuate wildly or disappear. They built up and maintained. That gives me confidence in the mechanism. Tolerance has been excellent. Nothing in my bloodwork or subjective experience raised any flags. This is the kind of compound that does its job quietly without causing problems. Exactly what you want.

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Community discussions about Ergothioneine

Research and educational reference only. Not medical advice.