Take 750 mg to 1,000 mg of magnesium per day. Magnesium acts as an antihistamine to clear air passages. A potent antioxidant multivitamin should contain 500 mg of magnesium, so add 250 to 500 mg per day. Take thymus extract. Your thymus gland releases proteins that are critical to immune system function.
Thymus products vary greatly in quality.
One of the best I've found is ProBoost dehydrated thymus protein, which is dissolved under the tongue. Each packet contains 2 mcg of purified calf thymus protein. Two to four packets a day are recommended for acute infection, and one packet a day is beneficial for chronic respiratory infections. As surprising as this may sound, regular exercise is an important part of the treatment and prevention of respiratory problems. I encourage you to begin walking for thirty minutes a day, at least three days a week.