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Vitamin C is a water-soluble vitamin. It is needed for normal growth and development.
Water-soluble vitamins dissolve in water. Leftover amounts of the vitamin leave the body through the urine. Although the body keeps a small reserve of these vitamins, they have to be taken regularly to prevent a shortage in the body.
Vitamin C is needed for the growth and repair of tissues in all parts of your body. It is used to:
- Form an important protein used to make skin, tendons, ligaments, and blood vessels
- Heal wounds and form scar tissue
- Repair and maintain cartilage, bones, and teeth
- Aid in the absorption of iron
Vitamin C is one of many antioxidants. Antioxidants are nutrients that block some of the damage caused by free radicals.
- Free radicals are made when your body breaks down food or when you are exposed to tobacco smoke or radiation.
- The buildup of free radicals over time is largely responsible for the aging process.
- Free radicals may play a role in cancer, heart disease, and conditions like arthritis.
The body is not able to make vitamin C on its own. It does not store vitamin C. It is therefore important to include plenty of vitamin C-containing foods in your daily diet.
For many years, vitamin C has been a popular household remedy for the common cold.
- Research shows that for most people, vitamin C supplements or vitamin C-rich foods do not reduce the risk of getting the common cold.
- However, people who take vitamin C supplements regularly might have slightly shorter colds or somewhat milder symptoms.
- Taking a vitamin C supplement after a cold starts does not appear to be helpful.
All fruits and vegetables contain some amount of vitamin C.
Fruits with the highest sources of vitamin C include:
- Cantaloupe
- Citrus fruits and juices, such as orange and grapefruit
- Kiwi fruit
- Mango
- Papaya
- Pineapple
- Strawberries, raspberries, blueberries, and cranberries
- Watermelon
Vegetables with the highest sources of vitamin C include:
- Broccoli, Brussels sprouts, and cauliflower
- Green and red peppers
- Spinach, cabbage, turnip greens, and other leafy greens
- Sweet and white potatoes
- Tomatoes and tomato juice
- Winter squash
Some cereals and other foods and beverages are fortified with vitamin C. Fortified means a vitamin or mineral has been added to the food. Check the product labels to see how much vitamin C is in the product.
Cooking vitamin C-rich foods or storing them for a long period of time can reduce the vitamin C content. Microwaving and steaming vitamin C-rich foods may reduce cooking losses. The best food sources of vitamin C are uncooked or raw fruits and vegetables. Exposure to light can also reduce vitamin C content. Choose orange juice that is sold in a carton instead of a clear bottle.
Serious side effects from too much vitamin C are very rare, because the body cannot store the vitamin. However, amounts greater than 2,000 mg/day are not recommended. Doses this high can lead to stomach upset and diarrhea. Large doses of vitamin C supplementation are not recommended during pregnancy. They can lead to shortage of vitamin C in the baby after delivery.
Too little vitamin C can lead to signs and symptoms of deficiency, including:
- . This mainly affects older, malnourished adults.
The Recommended Dietary Allowance (RDA) for vitamins reflects how much of each vitamin most people should get each day. The RDA for vitamins may be used as goals for each person.
How much of each vitamin you need depends on your age and gender. Other factors, such as pregnancy and illnesses, are also important.
The best way to get the daily requirement of essential vitamins, including vitamin C, is to eat a balanced diet that contains a variety of foods.
Dietary Reference Intakes for vitamin C:
Infants
- 0 to 6 months: 40* milligrams/day (mg/day)
- 7 to 12 months: 50* mg/day
*Adequate Intake (AI)
Children
- 1 to 3 years: 15 mg/day
- 4 to 8 years: 25 mg/day
- 9 to 13 years: 45 mg/day
Adolescents
- Girls 14 to 18 years: 65 mg/day
- Pregnant teens: 80 mg/day
- Breastfeeding teens: 115 mg/day
- Boys 14 to 18 years: 75 mg/day
Adults
- Men age 19 and older: 90 mg/day
- Women age 19 year and older: 75 mg/day
- Pregnant women: 85 mg/day
- Breastfeeding women: 120 mg/day
Smokers or those who are around secondhand smoke at any age should increase their daily amount of vitamin C an additional 35 mg per day.
Women who are pregnant or breastfeeding and those who smoke need higher amounts of vitamin C. Ask your health care provider what amount is best for you.
Ascorbic acid; Dehydroascorbic acid
Mason JB. Vitamins, trace minerals, and other micronutrients. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 218.
Salwen MJ. Vitamins and trace elements. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 23rd ed. St Louis, MO: Elsevier; 2017:chap 26.
Updated by: Emily Wax, RD, CNSC, University of Virginia Health System, Charlottesville, VA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
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