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.
How to Measure Vitamin C Content of Citrus Fruits. Vitamin C, also known as ascorbic acid, is an important and powerful antioxidant. Many parts of the human body, such as the immune system, require it to function properly. The RDA (Recommended Daily Allowance) for adults is no less than 60 milligrams a day.