These quick-dissolve tablets are clinically proven to shorten a cold when taken at the first sign of symptoms. This homeopathic cold remedy is made with two unique formulations of zinc, an essential mineral which has been shown to shorten the length of colds.* *Singh M, Das RR. Zinc for the common cold. Cochrane Database of Systematic Reviews 2011, Issue 2. Art. No.: CD001364. DO1: 10.1002/14651858.CD001364.pub3.