Colds are a relatively common type of upper respiratory infection, and if you start supplementing with calcium, iron, zinc and selenium before you catch a cold, it will not affect you during the cold. If you have a cold and want to promote recovery from the cold by supplementing calcium, iron, and zinc, that is also possible, but the main thing is to actively use anti-cold medications, such as the commonly used granules and cold capsules. Pay attention to a light diet, drink more water, eat more vegetables, keep indoor air circulation, and be sure to quit smoking. After recovering from a cold, usually 5-7 days after the cold, you can strengthen your body through more exercise to improve your body’s ability to resist disease.