common cold
2 interactions related to common cold
zinc + vitamin c
Zinc and vitamin C act on complementary arms of the immune system: zinc supports T-cell, B-cell, and natural killer cell function and can interfere with rhinovirus replication in the throat, while vitamin C supports white blood cell function and maintains skin and mucosal barriers. Taken together, the pair may modestly shorten and ease common cold symptoms when started early, though the human evidence for the combination specifically is limited.
elderberry + zinc
Elderberry (Sambucus nigra) anthocyanins show antiviral and anti-inflammatory activity in lab and some clinical studies, and zinc lozenges have moderate evidence for shortening colds when started early. People often combine them at the first sign of a cold or flu. They act on different parts of the infection cycle, but no trial has tested the elderberry-plus-zinc combination itself, so any added benefit from stacking is extrapolated rather than proven. The realistic effect is shortening, not preventing, an upper-respiratory infection.