Why We Need It
Vitamin C, a water-soluble vitamin, also is known as ascorbic acid. It has a wide variety of uses in the body, including helping to slow down or prevent cell damage. It also is needed to maintain healthy body tissues and the immune system. Vitamin C helps the body absorb iron from plant foods.
Recommended Daily Intakes of Vitamin C
|Age||Vitamin C (mg/day)|
|6 months-1 year||50|
|19 years and over||90|
|19 years and over||75|
|mg = milligrams
Source: adapted from the Dietary Reference Intakes series, National Academies Press. Copyright 1997, 1998, 2000, 2001, 2002, 2004, by the National Academies of Sciences.
People who smoke need an additional 35 mg of vitamin C every day.
The best way to get enough vitamin C is through foods rather than supplements. Fruits and vegetables are the best sources.
Sources of Vitamin C
|red or yellow sweet pepper, raw, medium||225|
|papaya, 1 medium||190|
|strawberries, halved, 1 cup||90|
|orange, 1 medium||80|
|cantaloupe, ¼ medium melon||50|
|potato, baked, 1 medium||20|
|mg = milligrams
oz = ounces
Vegetarians should include a vitamin C-rich food at every meal to help increase iron absorption since the iron in vegetarian foods is not well absorbed.
Some juices and cereals have vitamin C added. The amount of vitamin C in each product varies. Check the nutrition label to see how much vitamin C the product contributes to your daily need.
Ways to Retain It
Vitamin C is easily destroyed during preparation, cooking, or storage. To retain vitamin C, follow these tips:
- Eat raw fruits and vegetables as soon as possible after buying them.
- Cut vegetables just before eating or cooking.
- Cook vitamin C-rich foods quickly in as little water as possible.
- Microwave, steam, or stir-fry to retain the most vitamin C.
If We Don’t Get Enough
A deficiency of vitamin C is rare because it is found in many foods we eat. Scurvy, a disease caused by vitamin C deficiency, was common a few generations ago. At that time, it was prevalent among seamen who lived on dried and salted foods for months at a time. Today scurvy is rare in the United States, but not getting enough vitamin C can lead to anemia, bleeding gums, infections, and poor wound healing.
Healthy individuals who eat plenty of fruits and vegetables rarely need vitamin C supplements. Taking vitamin C supplements does not prevent colds. Some studies show that vitamin C supplements may decrease the duration of a cold.
Do not get more than 2000 mg/day of vitamin C from both foods and supplements. Although excess vitamin C is mostly eliminated in the urine, high doses can cause headaches, frequent urination, diarrhea, and nausea. People with a history of kidney stones should avoid high levels of vitamin C.
For More Information
The local county Extension office may have more written information and nutrition classes for you to attend. Also, your doctor, health care provider, or a registered dietitian (RD) can provide reliable information.
Reliable nutrition information may be found on the Internet at the following sites:
- Bobroff, Linda B. and Isabel Valentin-Oquendo. University of Florida Extension. Facts About Vitamin C. FCS8702. April 2006. http://edis.ifas.ufl.edu/publications.html
- National Academies of Sciences. National Academies Press. Dietary Reference Intakes series. 2004.
Originally published 07/07