Ergothioneine (L-Ergo), graded Moderate-evidence on Magellan — the one controlled cognition trial was positive but tiny (n=19). Studied dose: 25 mg three times weekly (the regimen in the 1-year cognition pilot RCT). Magellan links 16 peer-reviewed citations for Ergothioneine (L-Ergo).
Source: Heart 2019, PMID 31672783 ↗ · Nutraceuticals & Cellular Energizers · How Magellan grades evidence · Study write-up · evidence confidence: high
Ergothioneine (L-ergothioneine, "L-Ergo") is a naturally occurring sulfur-containing amino acid (a thiol/thione derivative of histidine) that is synthesized mainly by fungi and certain bacteria and cannot be made by the human body; mushrooms are by far the richest dietary source. It is absorbed from the diet and retained in tissues by a dedicated transporter, OCTN1/SLC22A4 (the ergothioneine transporter), and accumulates in cells and tissues that are exposed to oxidative stress. Mechanistically it acts as a potent antioxidant and cytoprotectant, scavenging reactive oxygen and nitrogen species, chelating metal ions, and modulating pathways such as Nrf2 and NF-κB. Some researchers have proposed classifying it as a "longevity vitamin."
In humans, blood ergothioneine levels tend to fall with age, particularly after 60, and multiple observational and prospective studies link lower plasma ergothioneine to a higher risk of cognitive decline, dementia, cardiovascular disease, frailty and overall mortality; in one 3,236-person cohort followed for about 21 years, higher levels tracked with meaningfully lower rates of coronary disease, cardiovascular death and all-cause mortality. A small one-year pilot trial in mild cognitive impairment (25 mg three times weekly) found improved learning scores and a stabilized neuronal-damage biomarker with clean safety labs, animal studies show lifespan and healthspan extension, and a direct mitochondrial target (activation of the enzyme MPST) was identified in 2025. However, most human data are observational and cannot prove causation - ergothioneine may partly mark a healthy, mushroom-rich diet - and large long-term randomized trials are still lacking, so benefits remain suggestive rather than established. This evidence describes the compound ergothioneine and its biomarker associations and mechanisms, not this specific commercial product.
Peer-reviewed studies on the active compound — citations link to PubMed.
“higher ergothioneine was an independent marker of lower risk of cardiometabolic disease and mortality”
“Ingestion of ergothioneine remarkably extended the lifespan of male mice and rescued age-related impairments”
“high plasma ergothioneine levels associated with reduced overall mortality”
“Subjects receiving ergothioneine demonstrated improved performance in assessment of learning ability and stabilized plasma levels of neurofilament light chain, compared with the placebo group, which saw no improvement in cognitive assessments and a significant increase in neurofilament light chain levels.”
“Lower plasma ET levels were associated with poorer baseline cognitive performance and faster rates of decline in function as well as in multiple cognitive domains including memory, executive function, attention, visuomotor speed, and language.”
“Plasma ET concentrations were lowest in dementia (p < 0.001 vs. NCI and CIND), with intermediate levels in CIND (p < 0.001 vs. NCI).”
Research describes the active mechanism and is not a claim about this specific product.
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Yes — its active compound is linked to 16 peer-reviewed studies, summarized and cited above.
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