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Algae products are attracting growing interest due to their pleasant taste and their high contents in protein, essential amino acids, vitamins, and minerals. Specifically, spirulina products are widely promoted for their high vitamin B12 content. So far, knowledge regarding the contamination with cyanotoxins, heavy metals, pesticides, or polycyclic aromatic hydrocarbons (PAHs) is scarce, although some studies reported high contaminant levels in spirulina products. The regular intake of spirulina, and very likely other algae products as well, as a dietary supplement in the gram range demands a closer monitoring of potentially harmful constituents.

Silke Grosshagauer, Klaus Kraemer, and Veronika Somoza: The True Value of Spirulina. Journal of Agricultural and Food Chemistry 2020 68 (14), 4109-4115
DOI: 10.1021/acs.jafc.9b08251

This article is not open access however, can be read online HERE