Researchers at the University of Alberta recently tested a random sampling of nine products. Health Canada validated the findings and went on to test an additional six products. They were all found to contain varying degrees of microcystin. It is also difficult to measure the degree of risk in each product as batches of the same product may differ. Microcystins are toxins which accumulate in the liver and can cause damage over the long term.
Children are particularly at risk of liver damage and gastro-intestinal effects from use over time.
High levels of exposure to the toxins can have irreversible effects. Those with concerns should contact their health care professional for advise. The majority of products containing blue-green algae in Canada are sold as nutritional supplements and are classified as food. This means that they are not regulated as long as specific medicals claims are not made and they are safe. If medical claims are made the product is then considered a drug and it is subject to the same requirements and regulations on safety, quality and effectiveness as a drug appoval for it to be sold.