Ergothioneine in Skincare: What the Research Shows
Ergothioneine is an antioxidant made by fungi and some bacteria that people get from food, and skin cells carry a transporter to take it up. The skin evidence for creams so far comes from mice and cell studies, not human trials.
TL;DR
- What it is: a small amino acid derivative that originates in microorganisms and reaches us through food.
- How skin handles it: keratinocytes carry a transporter called OCTN1 that takes ergothioneine in.
- The evidence: a 2024 study found a 10 mM ergothioneine cream reduced UV-induced damage markers in mice.
- The catch: it was a mouse and cell-line study, and a co-author co-founded an ergothioneine producer.
- Who it suits: people who like layering antioxidants and are happy with early evidence.
- Our position: we don't currently use it.
What is ergothioneine?
Ergothioneine (EGT) is a naturally occurring antioxidant. Humans don't make it, so it reaches us through diet, and it turns up in human tissues at roughly 100 micromolar to 2 millimolar, according to earlier work cited in the 2024 study below.
Mushrooms are the food people usually mention, but the original makers are microorganisms. Skincare versions are typically produced by fermentation.
What does it do for skin?
As an antioxidant, its job is to mop up reactive molecules that build up after UV exposure and pollution. In cell work, human keratinocytes appear to take it up through the OCTN1 transporter and hold on to it.
That is a useful property, because an antioxidant that skin cells accumulate could in theory last longer than one that washes straight out. Whether a cream delivers enough of it to matter in real life is still an open question.
Want an antioxidant step that already has a track record? Our Vitamin C Antioxidant Elixir with CoQ10 pairs ascorbyl palmitate, tocopherol and ubiquinone, or take the skin quiz to find your routine.
What does the research say?
A 2024 study in Clinical, Cosmetic and Investigational Dermatology (Li and colleagues) applied a 10 mM ergothioneine cream to mice exposed to UV for five days. Compared with UV plus a plain base, treated skin showed less epidermal thickening, less dermal inflammation, lower malondialdehyde and higher superoxide dismutase activity.
Collagen I and III and hydroxyproline were higher, and MMP1, MMP3 and MMP9 were lower. The cell side of the work used human keratinocytes challenged with etoposide, a DNA-damaging drug, not UV.
Limits matter here. It was a single-sex mouse model with one tested dose, the pathway claims go further than the experiments alone show, and one author co-founded a company that produces ergothioneine.
How do you spot it on a label?
Look for "Ergothioneine" in the ingredient list. It is usually a small-percentage extra, so expect it in the second half, near other antioxidants.
A typical serum line might read: Water, Glycerin, Ergothioneine, Tocopherol, Phenoxyethanol. Position hints at how much, but the list never shows a percentage.
How does it compare with other antioxidants?
| Ingredient | What it is | Best for |
|---|---|---|
| Ergothioneine | Microbe-made amino acid derivative | Antioxidant layering, early evidence |
| Vitamin E | Fat-soluble antioxidant from plant oils | Supporting oils and creams |
| CoQ10 | Fat-soluble antioxidant found in the body | Richer formulas |
| Astaxanthin | Carotenoid pigment from algae | Antioxidant add-ons |
Who should skip it or go slow?
A mouse UV study doesn't mean a cream protects you from the sun. Sunscreen stays non-negotiable, whatever antioxidant you layer under it.
If your skin is inflamed, broken or rashy, see a GP rather than adding a new active. Otherwise a patch test using our patch testing guide is enough.
How do you use it?
Most products are leave-on serums or creams applied once or twice a day on clean skin. Follow the pack directions, because strengths are rarely stated.
Do we use ergothioneine at Dope Skin Co?
We don't currently use it, and it is not in any of our formulas. Our antioxidant lines lean on vitamin E, CoQ10 and plant extracts.
FAQ
Is ergothioneine just mushroom extract?
No. Mushrooms contain it, but skincare ergothioneine is a purified single compound, usually made by fermentation.
Can it replace sunscreen?
No. The UV findings are from mice and describe cell-level markers, not sun protection.
Does it work better than vitamin C?
There is no head-to-head human evidence. They are different molecules with different jobs, and the evidence for ergothioneine is much earlier.
