Which herb is indicated for colds, flu, and respiratory infections?

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Elderberry stands out for colds, flu, and respiratory infections because it combines immune-supporting and antiviral actions. The flowers are traditionally used for upper respiratory symptoms like colds and sinusitis, while the ripe berries are valued for boosting the immune response during viral infections. Constituents such as anthocyanins and related flavonoids appear to help inhibit viral replication and modulate inflammatory and immune processes, which can help shorten the duration and lessen the severity of illness. Preparation matters: use cooked berries and floral preparations rather than raw plant parts, since raw seeds, leaves, and bark contain compounds that can be toxic. The other herbs listed don’t have as strong an association with acute respiratory infections in typical practice. That combination of antiviral activity, immune support, and traditional use for respiratory symptoms makes elderberry the best match.