Synopsis

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

Black currant (Ribes nigrum) has a long history of traditional use in Europe and Asia as a remedy for colds and other respiratory infections. The berries and leaves have been consumed in teas, syrups, and extracts, believed to strengthen the immune system and provide relief from cold symptoms. This traditional use is supported by the high content of vitamin C and polyphenols in black currant, both of which are known to contribute to immune health. Some laboratory studies have shown that black currant extracts exhibit antiviral activity against certain viruses, including influenza, in vitro. For example, a 2003 study found that black currant extracts could inhibit the replication of influenza virus in cell cultures. However, robust clinical trials in humans are lacking, and the evidence is not strong enough to claim clear efficacy against the common cold or other viral infections. Most support for its use as an antiviral in colds remains rooted in traditional herbal practices with some promising but preliminary scientific findings. Therefore, while black currant is commonly used in traditional medicine for colds, scientific validation is limited and more research is necessary to establish its effectiveness in humans.

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