Ergothioneine
1 brand compared · cheapest first
Life Extension
Mega L-Ergothioneine
25 mg L-ergothioneine · 30 capsules
$28.50for 30 doses
$0.950per dose
$0.038 / mg
25mg — the 'longevity vitamin' dose. Lower-dose Essential Youth (B09RN4GKGS, $18/30 caps, 5mg) for daily maintenance.
Note
Thorne and Pure Encapsulations don't carry standalone ergothioneine. Mushroom-rich diet (especially shiitake) is the natural source.