L-Ergothioneine (EGT) is a naturally occurring amino acid antioxidant that the human body can’t make on its own. It’s found in trace amounts in certain foods like mushrooms and beans, and plays a key role in cellular protection. What makes EGT unique is that our bodies have a dedicated transporter (called OCTN1) specifically designed to absorb and deliver it to areas most exposed to oxidative stress, such as the brain, liver, and skin.

Over time, our cells are exposed to oxidative and environmental stress that can impact how they function and recover. L-Ergothioneine helps to maintain mitochondrial health and support the body’s natural ability to protect and repair itself. Because the body doesn’t synthesize EGT and modern diets provide very little, maintaining adequate levels becomes increasingly important as we age. Supplementing with a pure, bioavailable form helps replenish what’s missing and supports long-term cellular resilience.

Most brands use mushroom extracts or purchase bulk L-Ergothioneine from outside suppliers, often of varying purity and origin. This matters because extract-based ingredients can contain only trace amounts of EGT or inconsistent levels from batch to batch, while bulk-sourced material often lacks full traceability or purity verification.
At GENEIII, we take a completely different approach. We are a biotechnology company first, not a reseller. Every capsule begins in our own research lab, where we produce L-Ergothioneine through a patented fermentation and purification system. This process allows us to achieve 99.99% verified purity, one of the highest levels ever recorded. Our commitment to traceability ensures you know exactly where your ingredient comes from and how it’s made.

Yes. L-Ergothioneine has been evaluated in multiple safety and toxicology studies. L-Ergothioneine supports long-term cellular protection, so it’s safe and beneficial for ongoing daily use. Think of it as a foundational nutrient for healthy aging, not a quick fix.

Every body is unique. Some users report noticing changes in energy, focus, or overall well-being after a few weeks of consistent use, while others experience more gradual results. We recommend daily use for at least 30-60 days for cumulative cellular benefits.

Yes. L-Ergothioneine can be safely combined with most supplements and multivitamins. However, if you’re pregnant, nursing, or taking prescription medications, we recommend consulting with a healthcare professional before use.

Every batch is rigorously tested in-house and by independent third-party laboratories for purity, identity, and potency. We use SGS and other accredited labs to confirm our 99.99% purity standard. Certificates of Analysis (COAs) are available upon request.