Host Defense

At Host Defense®, every product we develop is grounded in scientifically validated data to ensure exceptional quality and efficacy. Our mushroom mycelium and fruitbodies are cultivated on our certified organic farm in Washington State, and each supplement is non-GMO, vegan, and gluten-free.

To guarantee safety and consistency, all our products are independently verified for identity, purity, composition, and potency using internationally recognized, validated testing methods.

One of the most important discoveries in our research is the critical role of mushroom mycelium. As the longest-living part of the fungal organism, mycelium is made up of highly active cells that play essential roles—including serving as the organism’s immune response.

Years of scientific research, alongside rigorous third-party and in-house testing, confirm that mycelium-based supplements offer powerful immune support. That’s why we include mycelium in every single one of our formulas—because it works.*