Seaweeds are really good at sucking up chemicals in the water but we monitor regularly to ensure there are no heavy metals in our seaweed. Where we grow seaweed we test the water and the seaweed and we do not have detectable levels of lead, cadmium or mercury. We do not ship any product that has more than detectable levels. Why eat to be healthy but then ingest levels of toxic chemicals. Or use Biosea Pet but not look after your favorite companion
But in some areas and for some species they do concentrate and are used in water remediation. There is seaweed grown in the mouth of the Rhine River to extract out nitrogen, lead, cadmium to reduce the levels going into the North Sea. You don’t want a supply from this area!
Other seaweed is not harvested but washes up on the shore after storms. It will have contaminants you don’t want. In contrast our seaweed is grown in the clean sea (monitored), harvested, dried and put into product.
All with the latest state of the art gate to plate tracking process and formally organically certified.
Mortvedt, J.J. Heavy metal contaminants in inorganic and organic fertilizers. Fertilizer Research 43, 55–61 (1995). https://doi.org/10.1007/BF00747683