11/26/2025
You know how vitamin E was supposed to prevent Alzheimer's but completely flopped in clinical trials?
Turns out there's a good reason. Vitamin E only protects fats in your cells, but oxidative damage hits everything—DNA, proteins, the lot.
It's like trying to fireproof a house by treating only the curtains. Plus it barely gets into your brain anyway.
Professor Barry Halliwell, who's been studying antioxidants for over 50 years, thinks we've been looking in the wrong place this whole time.
Enter ergothioneine, a compound discovered in the 1980s and then basically forgotten.
Your body can't make it, but you have a dedicated transporter just to grab it from food and distribute it everywhere.
Your kidneys actively recycle it instead of letting you p*e it out. Evolution doesn't build specialised machinery for nothing, so this molecule is clearly important.
The richest source? Mushrooms, particularly oyster, shiitake, and lion's mane varieties.
Halliwell's Singapore team found something striking when they measured ergothioneine levels in people's blood.
Those with mild cognitive impairment had remarkably low levels. Same with Parkinson's patients. When they tracked 88 people over time, the pattern was clear: low ergothioneine predicted faster cognitive decline.
It also showed up in cardiovascular disease, frailty, and macular degeneration.
And unlike vitamin E, ergothioneine doesn't just protect. It gets into your mitochondria, might promote growth of new brain cells, boosts NAD+ levels, and reduces inflammation.
In a small pilot trial, 18 elderly people with mild cognitive impairment took 25mg of ergothioneine three times weekly.
Their global cognitive performance improved significantly compared to placebo, and a marker of neuronal damage that kept rising in the placebo group flattened out completely.
Not enough people for firm conclusions, but promising enough that they're seeking funding for a proper large-scale trial.
Studies in Singapore, Japan, and the US have all found that people who eat more mushrooms have lower rates of cognitive impairment.
Halliwell's careful not to overpromise, he recommends 2-3 portions of mushrooms per week.
But the implications are fascinating. We've been so focused on glamorous antioxidants like vitamin C that we overlooked this molecule our bodies are literally built to hoard.
It passes from mothers to babies, accumulates in mitochondria during exercise, and affects multiple systems simultaneously.
Maybe this forgotten mushroom molecule is part of how we age gracefully with our cognition in tact.
