Although they are different to the flu, having the symptoms of a cold-like a cough, sore throat and runny nose-can be bothersome. A severe cold can make you feel weak and ill too. Most colds are caused by viruses. Antibiotics are not effective against colds because they only fight bacteria.
Vitamin C Content. A 100-gram serving of orange or lemon provides you with 53 milligrams of vitamin C, which is 88 percent of the daily value of 60 milligrams per day. This serving equals either one small orange or slightly less than two lemons.
Plus that vitamin C could reduce chances of catching a cold (though the jury's still out on just how much impact C has on immunity). And lemons have another major plus: They're an antioxidant powerhouse (in addition to all the vitamin C) Suppressive effects of citrus fruits on free radical generation and nobiletin, an anti-inflammatory polymethoxyflavonoid.