3.Zinc
Some studies show it may help prevent and fight viruses, like the cold. For treatment, it may help shorten their length and lessen the severity if you take it within 24 hours of the first symptoms. You should continue to take zinc for five days. For cold prevention, some studies have used zinc for up to 4 months. The FDA says not to use zinc nasal products for colds – they carry the risk of permanent loss of smell.
4.Vitamin C
Its cold-fighting powers remain uncertain. Some research suggests it can cut cold symptoms short by about a day, but an analysis of multiple studies showed that only people on daily vitamin C at minimum doses of 200 mg each day who were under extreme physical stress were significantly less likely to get a cold. Taking vitamin C only after the start of symptoms has not been shown to be helpful.
