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Heavy metals All foods grown in water absorb heavy metals such as lead and mercury. Spirulina can contain too high concentrations of these metals. Studies suggest that this density of heavy metals in supplements such as spirulina has decreased over the years, but little further research has been done. In addition, you cannot read the presence of heavy metals from the label. Due to the large distribution this is difficult to control, especially if the spirulina is already processed in supplements. Microcystin Microcystin are amino acids that can be toxic to your liver if you take too many of them. Microcystin is also found in blue-green algae and therefore also in spirulina. Excessive use can be very bad for your health, mycrocystine can also cause cancer. In some states in America such as Oregon, there is even a limit set on the maximum concentration of microcystins in foods.