Key takeaways
- A dual extract uses two solvents, usually hot water and alcohol, and combines the results.
- Water draws out polysaccharides such as beta-glucans; alcohol draws out compounds such as triterpenes.
- There is no single industry standard for the order or method.
- “Dual extract” doesn’t tell you the part used, the ratio or the strength of effect.
- It’s reasonable to ask a brand exactly how its dual extract is made.
“Dual extract” appears on many mushroom labels, including ours. It describes a method, not a grade of quality or a guarantee of strength. This article explains why two solvents are used, how producers combine them, the practical trade-offs involved and what the term does and doesn’t tell you.
Why use two solvents?
Different compounds dissolve in different liquids. Chemists describe this in terms of polarity: water is very polar and dissolves polar compounds well; ethanol is less polar and dissolves a different range of compounds.
Mushrooms contain both kinds. The polysaccharides in the cell wall, including beta-glucans, are water-soluble and are traditionally extracted by simmering, as in the teas and decoctions long made from Reishi and Chaga. Other compounds, such as triterpenes and sterols, dissolve poorly in water but much better in alcohol.
Neither solvent does both jobs well. Hot water leaves most triterpenes behind; strong alcohol extracts little polysaccharide. Using both aims to capture a broader range of what the mushroom naturally contains.
The hot water stage
Hot water extraction is the older method. Heat helps break down the tough, chitin-rich cell walls of the fungus and dissolves the water-soluble compounds inside. The resulting liquid is similar in principle to a traditional mushroom tea, but prepared under controlled conditions. See Hot-Water Mushroom Extraction Explained.
The alcohol stage
Alcohol extraction, usually with food-grade ethanol, draws out compounds that water leaves behind. It also plays a second role in the finished product: the alcohol preserves the tincture, so no additional preservatives are needed. See Alcohol Mushroom Extraction Explained.
Which mushrooms benefit most?
The case is strongest for species where both groups of compounds are important. Reishi is the classic example, with its well-known triterpenes alongside its polysaccharides. Chaga is similar. For others, the balance differs, but using both solvents gives a broader extract across the board.
Ways of combining the two
There is no single industry standard. Common approaches include:
- Alcohol first, then water: the mushroom is macerated in alcohol, filtered, and the remaining material is then extracted in hot water.
- Water first, then alcohol: the reverse order.
- Parallel extraction: separate portions of mushroom are extracted in each solvent.
In each case, the two liquids are then blended. What matters is that both stages are done carefully and that the brand is open about its method.
The balancing act
Combining the extracts involves trade-offs:
- Preservation: the finished tincture needs enough alcohol to remain stable.
- Precipitation: adding alcohol to a water extract can make some polysaccharides come out of solution as sediment. This is normal, and it’s why tinctures should be shaken before use.
- Concentration: more water dilutes the tincture; some producers reduce the water extract before combining.
Where ultrasonic extraction fits in
Some producers, including us, use ultrasonic extraction during the hot water stage. High-frequency sound waves create tiny bubbles in the liquid that form and collapse rapidly, helping to disrupt cell walls so that more of the mushroom’s contents come into contact with the solvent. Ultrasound-assisted extraction is a well-established technique in food and plant science. You can read more in Ultrasonic Extraction for Mushrooms.
What makes a good dual extract?
- Quality starting material, ideally fruiting bodies.
- Both stages carried out properly, not one as a token gesture.
- Clear information about the method and ratio.
- No unnecessary additions.
What “dual extract” doesn’t tell you
The term is useful, but it has limits:
- It isn’t a legally defined standard, so two “dual extracts” can be made quite differently.
- It doesn’t tell you which part of the mushroom was used: fruiting body or mycelium.
- It doesn’t tell you how much mushroom went in, which is what an extract ratio describes.
- It doesn’t mean a product is stronger or will have a greater effect.
How we make our dual extracts
At Spore & Bloom we extract UK-grown fruiting bodies, and wild chaga from Finland, in hot water, using ultrasonic extraction, and separately in plant-derived ethanol. The two extracts are then carefully combined into a single tincture, prepared in small batches in Dorset. For the full process, read From Mushroom to Bottle: The Extraction Workflow and The Complete Guide to Mushroom Extraction.