Vitamin C (immune system)
Water-soluble antioxidant and cofactor that supports all levels of the immune system. Especially important during infection and stress.
What is Vitamin C (immune system)?
Vitamin C, also known as ascorbic acid, is a water-soluble antioxidant that plays a crucial role in the body's immune system. It is a cofactor for several enzymatic reactions and is essential for the body to produce collagen, which is necessary to maintain the integrity of the skin and connective tissue. During periods of infection and stress, the need for vitamin C may increase, making it a key nutrient for supporting the immune system.
How does it work in the body?
Vitamin C acts as a powerful antioxidant in the body, meaning it helps neutralise free radicals that can damage cells. It also contributes to stimulating the production of white blood cells, which are vital for the body's defence against infections. By enhancing the function of immune cells such as T-cells and neutrophils, vitamin C plays an important role in maintaining an effective immune response.
Scientific benefits
Several studies have demonstrated the benefits of vitamin C for the immune system. A review published in the Journal of Clinical Medicine indicated that adequate levels of vitamin C can reduce the risk of developing infections, especially under physical stress, such as in athletes. Another study published in Nutrients showed that vitamin C can shorten the duration and severity of colds.
- According to a meta-analysis, daily supplementation with vitamin C can reduce the risk of colds by up to 50% in susceptible groups.
- Research has shown that vitamin C can improve immune response in older individuals, which is particularly important as the immune system naturally declines with age.
Dosage and recommendations
The recommended daily dose of vitamin C varies depending on age and sex. For adults, it is generally recommended to consume 75-90 mg per day. During periods of stress or illness, higher doses up to 2000 mg per day may be considered safe, but it is always best to consult a doctor before increasing your dose.
Best sources and forms
Vitamin C is naturally found in many fruits and vegetables. Here are some of the best sources:
- Oranges
- Kiwi
- Strawberries
- Papaya
- Broccoli
- Red bell pepper
It is also possible to obtain vitamin C through dietary supplements, which come in various forms including tablets, capsules, and powders. It is important to choose high-quality products to ensure optimal absorption.
Side effects and warnings
Generally, vitamin C is safe when taken at recommended doses. However, high doses can cause side effects such as gastrointestinal discomfort, diarrhoea, and nausea. People with kidney stones or kidney problems should be particularly cautious with high intakes of vitamin C, as it may increase the risk of kidney stones. It is always advisable to consult a doctor if you are uncertain about dosage or have specific health conditions.
Frequently asked questions
What symptoms indicate a vitamin C deficiency?
Symptoms of vitamin C deficiency can include fatigue, weakness, bleeding gums, and in severe cases scurvy, which can lead to serious health effects.
Can I get enough vitamin C through diet?
Yes, most people can obtain sufficient vitamin C through a balanced diet that includes fruits and vegetables. It is recommended to eat a varied diet to ensure adequate intake.
Is vitamin C effective against colds?
Research shows that vitamin C can help shorten the duration of colds and reduce symptoms, but it is not a guarantee to prevent them.
Can I take vitamin C if I am pregnant?
Yes, vitamin C is important during pregnancy, but it is important to follow recommended doses and consult a doctor before taking supplements.
How should I store vitamin C?
Vitamin C should be stored in a cool, dry place and protected from light to prevent degradation.