Premium Antioxidant

GLISERA EGT®

Branded ergothioneine from golden oyster mushroom — a powerful, naturally occurring antioxidant for beauty-from-within, skin health and healthy aging. Vegan, non-GMO and clean-label.

Golden Oyster Mushroom Extract

Close-up of fresh oyster mushrooms cluster

What Is Ergothioneine (EGT)?

Ergothioneine (often written L-ergothioneine, or EGT) is a naturally occurring amino acid derivative — a unique, water-soluble antioxidant. It is produced in nature mainly by microorganisms and fungi; humans cannot synthesize it and must obtain it from the diet, with mushrooms among the richest sources.

Ergothioneine takes its name from ergot, the fungus from which it was first isolated in 1909 — though today it is sourced from edible mushrooms such as the golden oyster.

VeganNon-GMOGluten-FreePreservative-Free

Cluster of oyster mushrooms with mushroom powder

The "Longevity" Antioxidant

What makes ergothioneine unique is how the body handles it. A dedicated transporter — OCTN1 (the ergothioneine transporter, ETT, an organic cation transporter) — actively carries EGT into cells and concentrates it where oxidative stress is highest, including the mitochondria.

Because it is rapidly absorbed and stored in red blood cells, ergothioneine maintains plasma levels far longer than many antioxidants — supporting long-lasting cellular health from within. This distinctive biology is why EGT has attracted strong interest in healthy aging and longevity research.

OCTN1 transporter actively concentrates EGT in mitochondria and high-stress tissues

Antioxidant Mechanism

A Powerful Antioxidant

Scavenges Free Radicals

EGT scavenges reactive oxygen species and free radicals — including highly damaging hydroxyl radicals — helping to neutralise the radical activity behind cellular ageing.

Stable & Well Absorbed

Unlike glutathione (GSH), which breaks down easily in the gut, ergothioneine is stable and well absorbed — making it an effective antioxidant choice for oral formulations.

Long-Lasting Protection

Stored in red blood cells, EGT maintains plasma levels far longer than conventional antioxidants — providing sustained cellular protection from within.

How GLISERA EGT® Is Positioned

Designed to help manufacturers develop differentiated products across beauty, wellness and healthy aging categories.

Beauty-from-Within

Supporting skin moisture, the skin barrier, and a brighter, more even-looking complexion.

Antioxidant Defence

Supporting the skin and body's defences against everyday oxidative and UV-related stress.

Healthy Aging

An antioxidant associated with healthy-aging research and longevity science.

Restful Beauty Sleep

Supporting overnight recovery and restorative sleep for visible morning radiance.

Product Overview

GLISERA EGT® delivers pure ergothioneine extracted from golden oyster mushroom — one of nature’s richest sources. It is a clean, water-soluble powder that is vegan, non-GMO, gluten-free and preservative-free, standardised to ergothioneine ≥ 0.7%.

For brands that want a recognisable, naturally derived antioxidant with a premium story, GLISERA EGT® offers branded quality and full documentation.

Ingredient	Branded ergothioneine (GLISERA EGT®)
Source	Golden oyster mushroom extract
Form	Powder (water-soluble)
Specification	Ergothioneine ≥ 0.7%
Origin	Taiwan
Suggested Use	700 mg/day
Shelf Life	24 months from manufacture date

Sourced from golden oyster mushroom — one of nature’s richest ergothioneine sources

GMP-certified extraction and manufacturing facilities in Taiwan

Rigorous quality control with HPLC standardisation

Reliable bulk supply with full documentation

Capsules and tablets

Functional beverages and beauty drinks

Beauty and skincare supplements

Functional foods and gummies

Woman with golden oyster mushrooms skincare advertisement

Did You Know?

Humans cannot synthesize ergothioneine and must obtain it from the diet. Mushrooms are among the richest dietary sources — with golden oyster mushroom being exceptionally high in this unique antioxidant.

Sourcing & Availability

Ergothioneine has historically been costly and difficult to source at scale, and limited availability of L-ergothioneine has kept it out of many formulations. As a reliable L-ergothioneine supplier, FC Materials helps manufacturers access GLISERA EGT® with the cost, quality and documentation needed to bring EGT into real products.

What We Provide:

Supplier coordination and bulk supply
Full specification sheets and COA
Halal-suitability documentation on request
Formulation direction and MOQ discussion

Golden oyster mushroom supplement scientific highlights infographic

Regulatory Status

Ergothioneine has gained regulatory recognition in several markets — including GRAS status in the United States and Novel Food approval in the EU for certain ergothioneine sources.

Documentation on GLISERA EGT®’s specific regulatory and Halal-suitability status is available on request. Our team supports manufacturers with the documentation needed for compliant product development across global markets.

GRAS — USANovel Food — EUHalal-Suitable

Oyster mushrooms on glass dish with golden molecules

Research Background

Ergothioneine is an active area of research. Studies have explored its antioxidant, anti-inflammatory and cytoprotective properties.

Biochem Biophys Res Commun.

2023;682:163–173

Front Med (Lausanne).

2024;11:1396783

Food Sci Nutr.

2025;13(6):e70382

Oxid Med Cell Longev.

2020;2020:2576823

Want the full evidence? The complete GLISERA EGT® research pack is available to manufacturers on request.

Request the Full Research Pack

Part of Our Branded Ingredient Range

Brands building a beauty or wellness range can also explore our functional mushroom ingredients — all from trusted partners.

Reishivive®

Reishi

NeurOasis®

Lion's Mane

Cordyvigor®

Cordyceps

Harporia®

Poria Cocos

HepaAegis®

Antrodia

OmniMycan®

Agaricus Blazei

Frequently Asked Questions

It is ergothioneine (EGT) extracted from golden oyster mushroom — one of the richest natural sources of this unique antioxidant.

GLISERA EGT® is mushroom-derived. Some ergothioneine on the market is produced by fermentation/biosynthesis from microorganisms; GLISERA EGT® offers a naturally extracted, branded alternative.

No. We source and supply it from a trusted global partner. FC Materials acts as your sourcing partner, providing documentation, MOQ discussion, formulation direction and supplier coordination.

It is vegan, non-GMO, gluten-free and preservative-free. Halal-suitability documentation can be confirmed on request.

Yes — request documentation and samples to evaluate suitability for your formulation. Our team will support your development with full specifications, COA and research materials.

Bring Beauty-from-Within to Your Next Product

Request GLISERA EGT® documentation, samples, the research pack and pricing. Tell us your application and target market, and our team will support your development.