Vitamin C cannot be made by the human body and so is an essential component of the diet. It is needed for the health and repair of various tissues in your body, including skin, bone, teeth and cartilage. Persistent lack of vitamin C in your diet can lead to a condition called scurvy. Symptoms of scurvy include easy bruising, easy bleeding and joint and muscle pains. Vitamin C deficiency can be treated with supplements of vitamin C and a diet rich in vitamin C.
What is vitamin C?
Vitamins are a group of substances needed in small amounts by the body to maintain health. Vitamin C is also called ascorbic acid. It cannot be made by the human body and so is an essential component of your diet. Vitamin C is needed to make a substance called collagen which is required for the health and repair of various tissues in the body, including:
- Ligaments and tendons
- Blood vessel walls
There are various foods that are rich in vitamin C, including:
- Citrus fruits like oranges, grapefruit, limes and lemons.
- Berries such as blackcurrants, strawberries, raspberries, blueberries and cranberries.
- Cantaloupe melon and watermelon.
- Kiwi fruit.
- Vegetables such as spinach, green and red peppers, tomatoes, cauliflower, cabbage, broccoli, Brussels sprouts and potatoes.
Certain foods such as cereals are fortified with vitamin C, which means that they have vitamin C added to them. Vitamin C is also found in fresh milk, fish and offal such as liver and kidney.
Around 90% of vitamin C in the human diet is from fruit and vegetables. Cooking fruit and vegetables reduces their vitamin C content by around 30-40%.
The recommended daily intake of vitamin C in the diet depends on your age and sex. Pregnant and breast-feeding women also need higher amounts of vitamin C in their diet.
- Children aged 1-10 years need 30 mg of vitamin C per day.
- Children aged 11-14 years need 35 mg of vitamin C per day.
- Children over the age of 15 years and adults need 40 mg per day.
What is vitamin C deficiency?
Deficiency, or a lack, of vitamin C in your body happens because of a lack of sufficient amounts of vitamin C in your diet. Over time, a lack of vitamin C means that new collagen cannot be formed. This causes various tissues in your body to start to break down and the health and repair of your body become affected. Persistent (chronic) vitamin C deficiency, usually over a period of around three months or more, can lead to an illness known as scurvy.
How common is vitamin C deficiency?
Scurvy due to vitamin C deficiency is rare in the UK.
There are certain groups of people who are more at risk of vitamin C deficiency. They include:
- People dependent on drugs and/or alcohol who may not have a healthy, balanced diet.
- People who go on fad diets.
- People living on a low income who tend not to buy foods with a high vitamin C content.
- People with a medical condition that affects the body's ability to digest and absorb food, such as Crohn's disease and ulcerative colitis.
- Older people who may eat a less varied diet.
- Smokers. Smoking affects the absorption of vitamin C from foods and also vitamin C is used up in the body more quickly in those who smoke.
- Pregnant and breast-feeding women because they need higher amounts of vitamin C.
What are the symptoms of vitamin C deficiency?
The first symptoms of vitamin C deficiency tend to be:
- Tiredness and weakness.
- Muscle and joint pains.
- Easy bruising.
- Spots that look like tiny, red-blue bruises on your skin.
Other symptoms can include:
- Dry skin.
- Splitting hair.
- Swelling and discoloration of your gums.
- Sudden and unexpected bleeding from your gums.
- Poor healing of wounds.
- Problems fighting infections.
- Bleeding into joints, causing severe joint pains.
- Changes in your bones.
- Tooth loss.
- Weight loss.
If not diagnosed and treated, vitamin C deficiency can also lead to shortness of breath, nerve problems, high temperature (fever) and fits (convulsions). Bleeding inside the brain and around the heart can cause death in some people with untreated vitamin C deficiency. However, this is extremely rare.
Do I need any investigations?
Your doctor may suspect vitamin C deficiency after asking you careful questions about your diet and listening to the symptoms that you have. A blood test can be taken to measure vitamin C levels and may help to confirm the diagnosis.
Your doctor may also suggest some other blood tests to check for other deficiencies in your diet. For example, vitamin C is also needed for the absorption of iron from food. Therefore, iron deficiency often occurs in people who are deficient in vitamin C.
X-rays to look at your bones may also be suggested because specific changes to the bones, including 'thinning' of the bones, are often seen in someone with vitamin C deficiency.
What is the treatment for vitamin C deficiency?
The treatment for vitamin C deficiency is to replace the vitamin C that is lacking in your diet. This can be achieved by taking vitamin C supplements and by eating a diet rich in vitamin C. You may be referred to a dietician for help. After a period of time, vitamin C supplements can usually be stopped. However, it is important to continue to eat a diet rich in vitamin C after the supplements are stopped. This will help you to avoid becoming deficient in vitamin C again.
What is the outlook (prognosis)?
People with vitamin C deficiency usually make a full recovery. Once treatment to replace vitamin C is started, symptoms usually quickly improve within days or weeks.
Can vitamin C deficiency be prevented?
Vitamin C deficiency can be prevented by making sure that you have a healthy, balanced diet that contains plenty of fruit and vegetables including those high in vitamin C that are listed above. As a rough guide, one large orange a day will provide you with enough vitamin C.
Dr Michelle Wright
Dr Louise Newson
Prof Cathy Jackson