Key takeaways
- Mushrooms can take up heavy metals from their surroundings.
- Levels depend on species, environment and substrate.
- Wild material varies more with where it grew.
- UK law sets limits; ask what testing covers a product.
Mushrooms can take up substances from their surroundings, including heavy metals. This article explains why testing matters.
Why mushrooms can accumulate metals
Fungi absorb nutrients from their substrate and environment. Along with useful minerals, they can take up heavy metals such as lead, cadmium, mercury and arsenic if these are present. Levels depend on species, growing environment and substrate.
Wild versus cultivated
- Cultivated mushrooms grow on controlled substrates, which can reduce variability.
- Wild material, such as chaga, depends on where it grew, including soil and pollution. See Chaga Harvesting and Sustainability.
Legal limits
In the UK, legal maximum levels apply to certain contaminants in foods, including specific limits for some heavy metals in food supplements. Responsible producers check that their materials are within them.
How testing works
Laboratories measure heavy metals using sensitive analytical techniques and report results against specifications. Results appear on a Certificate of Analysis. See Certificates of Analysis.
What to ask
- Is heavy metal testing carried out?
- On raw material, finished product or both?
- For which batch, and when?
Our approach
If you’d like to know what testing covers our tinctures, get in touch.