It is perfectly fine to take calcium tablets for colds. Cold is a change in the mucous membrane of the upper respiratory tract that is congested, edematous, and even has inflammatory substances exuding due to a decrease in the body’s resistance to invasion by such pathogens as viruses, bacteria, mycoplasma, and chlamydia. Calcium tablets, in addition to supplementing calcium and preventing osteoporosis, can also reduce the permeability of capillaries, which can alleviate the pathological changes of nasal congestion, sneezing and increased secretion and exudation of inflammatory substances, and can alleviate these symptoms of cold and flu, which is beneficial to the recovery of cold and flu. However, do not take cold medicine at the same time as calcium tablets, as it may reduce the effectiveness of cold medicine.