Does zinc help with the common cold?
In this meta-analysis of randomized controlled trials, zinc supplementation was not shown to reduce the risk of getting a cold. In participants who already had a cold, zinc lozenges and nasal sprays reduced the duration of illness by approximately 2.4 days but increased the risk of adverse events such as stomach upset.
Could a personalized supplement reduce the incidence or severity of respiratory infections?
No effect of vitamin D on preventing respiratory tract infections in older adults
Xylitol for ear infections, respiratory infections, and dental cavities
Bovine colostrum for upper respiratory tract infections in children
An echinacea-zinc–vitamin C combination, with or without vitamin D, for respiratory infections
Probiotics for chronic rhinosinusitis
Reynoutria japonica for respiratory tract infections
Factors associated with an increased risk of upper respiratory tract infection
Smoking may increase the risk of several respiratory diseases, including severe COVID-19
Infant formulas with prebiotics, probiotics, or synbiotics for the prevention of respiratory tract infections
Is zinc useful for preventing or treating respiratory tract infections?
Tea catechin consumption and tea gargling may reduce the risk of upper respiratory tract infections
Probiotics plus vitamin C reduce symptoms of upper respiratory tract infection in children
Probiotic yogurt and upper respiratory tract infections