What side effects does spirulina cause?

Based on information from, a free medication monitoring service, 12% of patients experience side effects while taking spirulina. Some of the side effects reported by iGuard members include itching and rash. Please follow up with your doctor or other healthcare provider if you are experiencing any symptoms that worsen or do not go away.
Spirulina, also known as blue-green algae, may have side effects in some cases.

If it is grown in controlled settings and kept free of harmful contaminants, it produces no significant side effects. However, some spirulina harvested from open ponds may be contaminated with microorganisms that can harm the liver, as well as toxic heavy metals. If you consume contaminated spirulina, you could experience nausea, stomach pain, vomiting, weakness, thirst, rapid heartbeat and even death. Children are particularly susceptible to side effects from contaminated spirulina.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.