Reishi (Ganoderma lucidum) has been written about in ancient texts and passed down through generations as a valued botanical in various wellness traditions.* But what exactly is it, and why has it remained relevant for so long? Here are three essential things to know about this remarkable fungus.

1. Reishi Grows Naturally on Hardwood Trees

In the wild, Reishi is a wood-decaying fungus that typically grows at the base or on the stumps of deciduous trees such as maple, oak, and plum. It prefers warm, humid environments and is found in many parts of Asia, Europe, and North America.

What makes Reshi distinct:

The mature Reishi has a shiny, kidney-shaped cap with a lacquered appearance, ranging in color from reddish-brown to deep purple. Unlike common button mushrooms, Reishi is woody and tough—not something you would cook and eat like a vegetable.

Why this matters:

Wild Reishi is relatively rare and slow-growing, which makes sustainable cultivation essential. Unlike relying on uncertain wild sources, GANOHERB maintains its own natural cultivation bases. This proprietary approach allows the brand to control every stage of growth—from soil and climate conditions to harvest timing—ensuring consistent quality, batch-to-batch purity, and full protection of wild populations.

2. It Contains a Rich Mix of Naturally Occurring Compounds

Like many botanicals used in traditional practices, Reishi produces a variety of natural substances as it grows. Two groups of compounds are often mentioned in general literature:

Triterpenes (or ganoderic acids) – responsible for the characteristic bitter taste of Reishi

Polysaccharides (specifically beta-glucans) – found in the cell walls of the fungus

These compounds exist in varying proportions depending on the mushroom's age, growing conditions, and which part is used (fruiting body versus spores).

3. Quality Depends on Three Things: Source, Processing, and Testing

Not all Reishi products are the same. Even when the species is identical, three factors determine the quality of what ends up in your container.

Source:

Where and how the Reishi is grown matters. Clean soil, pure water, and controlled growing conditions help minimize unwanted environmental elements. Organic cultivation avoids synthetic pesticides or chemical fertilizers.

Processing:

Fresh Reishi is too woody to consume directly. It is typically dried, sometimes extracted, and often ground into powder. For reshi spore powder (the "seeds" of the mushroom), a proper wall-breaking process is commonly used to make the inner contents more accessible. Poor processing can lead to oxidation or contamination.Some brands go a step further to preserve the mushroom's natural profile. For example, GANOHERB uses low-temperature cell-wall breaking technology (crack-rate of 99%)—a gentle, solvent-free method that operates at low temperatures. This technique helps maximize the preservation of Reishi's naturally occurring compounds while avoiding heat or chemical damage. It is widely considered one of the most effective ways to maintain the integrity of the raw material.

Reishi is a fascinating herb with a long history of traditional use. It grows on hardwood trees, contains a complex mix of natural compounds, and varies widely in quality based on how it is grown, processed, and tested. When choosing a Reishi product, look for transparency about origin, processing methods, and third-party lab results.

FDA Disclaimer: 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.