Evidence supporting the use of: Spirulina
For the health condition: Infection (viral)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Spirulina, a blue-green algae, has been studied for its potential antiviral properties. Several in vitro and animal studies have demonstrated that spirulina extracts can inhibit the replication of certain viruses, including herpes simplex virus, influenza virus, HIV, and others. The proposed mechanisms involve the stimulation of the immune system, notably by increasing the production of interferons and activation of natural killer cells. Spirulina contains compounds such as calcium spirulan, a sulfated polysaccharide, which has shown antiviral effects against enveloped viruses in laboratory settings.

However, while these preclinical findings are promising, strong evidence from well-designed human clinical trials is limited. There are a few small-scale human studies suggesting immune-enhancing effects of spirulina (such as increased production of cytokines and improved resistance to viral infections), but these studies are preliminary and often have methodological limitations.

In summary, the use of spirulina to support or treat viral infections is primarily supported by laboratory and animal studies, with a modest amount of early clinical evidence. Its role is not yet established in mainstream medicine, and more robust clinical trials are needed to confirm its efficacy in humans. Therefore, while there is scientific interest and some validation, the overall quality and quantity of evidence remain limited, warranting a moderate evidence rating.

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