Synopsis

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

Phaeophyceae, commonly known as brown seaweeds, have been investigated for their potential antiviral properties, including possible effects against cold viruses such as rhinoviruses and coronaviruses. Scientific interest primarily centers on compounds like fucoidan and phlorotannins, which are polysaccharides and polyphenols found in high concentrations in several brown algae species. In vitro studies have demonstrated that these compounds can inhibit the replication of certain viruses, and some research suggests they may interfere with viral attachment and entry into host cells. However, most of this evidence comes from laboratory or animal studies rather than robust human clinical trials. While there is a plausible biochemical rationale and promising preliminary data, there is currently insufficient direct clinical evidence to confirm that Phaeophyceae or their extracts are effective for treating or preventing the common cold in humans. Thus, while their use as an antiviral is supported by scientific exploration and some laboratory validation, the overall level of evidence remains low, and such use should be considered experimental. Clinical trials in humans are needed to establish efficacy and safety for this indication.

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