CALM UNDER CHALLENGE: Lion’s Mane and Immune Balance

A healthy immune system responds when needed and stays calm when it’s not. When it comes to immune health, strength isn’t about our immune systems being “on” all the time. Instead, healthy immune function is all about balance.* 

New preclinical research from the Host Defense® research team, published in the peer-reviewed journal Immuno, explores how Lion’s Mane mushroom mycelium supports immune balance and cellular resilience under stress. The findings highlight why not all Lion’s Mane supplements are the same, and why mycelium matters.*

Read about the study here to find out more: About Host Defense Lion’s Mane

What Makes Lion’s Mane Mycelium Different from Fruiting Bodies? 

Lion’s Mane is widely known for cognitive support, but its benefits also extend to immune and cellular health. And different parts of the mushroom produce different beneficial compounds:*

• Mycelium (the underground fungal network) is associated with unique beneficial compounds called erinacines* 
• Fruiting bodies (the mushroom cap and stem) are associated with different polysaccharides, including certain beta-glucans 

Due to their range of benefits, Host Defense uses both USA-grown Lion’s Mane mushroom mycelium and fruiting bodies to formulate our extract supplements, but it’s important to understand that these materials are biologically distinct. 

What Did the New Lion’s Mane Research at Host Defense Look Like? 

Our scientists wanted to understand how Host Defense Lion’s Mane mushroom mycelium affects human immune health. So, they conducted a preclinical laboratory study where they examined the effects that Lion’s Mane mushroom mycelium had on human immune cells in vitro when they were placed under stress. The research went like this: 

• First, they examined the immune cells under baseline conditions (unstressed). 
• Next, they tested the immune cells under challenge conditions (put under stress).

For comparison, our researchers conducted the same test using a store-bought extract made from imported Lion’s Mane fruiting bodies. 

Once the test was complete, they compared the results to best understand the different ways that each Lion’s Mane mushroom extract affected immune health. 

This was a preclinical study conducted in human immune cells outside the body, providing an important first step in understanding biological mechanisms prior to clinical investigation.* 

How Does Lion’s Mane Mushroom Mycelium Support the Immune System? 

One of the study’s most meaningful discoveries was that Lion’s Mane mushroom mycelium supports immune signaling pathways to support balanced immune activity. Our scientists witnessed the Host Defense Lion’s Mane mushroom mycelium supporting an immune response that remained calm under challenge.*

• Under normal conditions, immune activity remained low and measured* 
• Under stressed conditions, Lion’s Mane mushroom mycelium helped aid in the reduction of markers typically associated with cellular stress signaling* 
• At the same time, the mycelium supported pathways involved in immune readiness and communication* 

This type of response is often referred to as immunomodulation, a concept which describes the immune system’s potential to adapt appropriately when put under stress, rather than pushing it into overdrive.* 

Interestingly, the extract made from imported fruiting bodies showed something altogether different. When put under the same stress, the fruiting body extract supported hyperactivity in the immune response. This kind of hyperactivity can contribute to cellular stress signaling within the immune system, underscoring how source and preparation influence biological activity.* 

What About Antioxidant Support and Cellular Resilience? 

Immune balance and oxidative stress are closely connected. In this research, Lion’s Mane mushroom mycelium demonstrated: 

• Support for antioxidant activity in laboratory assays* 
• A greater potential to support the binding of excess iron compared to the extract made from imported fruiting bodies; an important factor because excess free iron can contribute to oxidative stress at the cellular level* 

These findings suggest that Lion’s Mane mushroom mycelium may help support the body’s natural ability to maintain cellular resilience during periods of stress.* 

Why Does Preparation and Testing Matter? 

This research reinforces a critical point: not all Lion’s Mane supplements behave the same way. 

An extract’s interactions with immune pathways can shift dramatically based on the following factors: 

• Mushroom life stage (mycelium vs. fruiting body) 
• Cultivation methods 
• Extraction and processing 

That’s why Host Defense prioritizes the cultivation of mushroom mycelium, which is the largest and longest-living life stage of the mushroom organism. Through species authentication and functional testing, we’ve seen how mushroom mycelium acts as the immune response of the whole mushroom, and this study demonstrates how it can also support human immune systems.* 

What Does the New Lion’s Mane Research Mean for Everyday Wellness? 

While further human clinical research is needed, these findings add to a growing body of scientific literature suggesting that Lion’s Mane mushroom mycelium supports immune balance and adaptive stress response, rather than overactivity.* 

At Host Defense, we believe true immune support means working with the body’s natural intelligence and helping it to remain responsive, resilient, and grounded in balance.* 

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.