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In 2022, nearly 20% of French adults consumed less than two-thirds of the recommended daily intake of vitamin C. But what is vitamin C, and what are its benefits for health and sports? Nutrimuscle explains everything you need to know about this essential vitamin.
What is vitamin C?
Vitamin C, also known as ascorbic acid, is a water-soluble vitamin naturally present in many foods. It is essential for the proper functioning of the body as it plays a major role in collagen production—a key component of connective tissue, necessary for healthy bones, teeth, and skin.
It is also a powerful antioxidant that protects cells against damage caused by free radicals, which are responsible for cellular aging and certain chronic diseases. Vitamin C also supports the immune system by stimulating white blood cell production.
Vitamin C and its health benefits
Vitamin C is known for its antioxidant properties: it protects cells against damage linked to free radicals, unstable molecules that can alter DNA and cell membranes.
It also contributes to strengthening the immune system. Several studies have shown that vitamin C promotes the proliferation of immune cells, improving the body's response to infections. A deficiency can therefore weaken natural defenses and increase the risk of illness.
Vitamin C also plays a role in the formation of collagen, which is essential for the health of skin, joints, and connective tissues. By supporting this synthesis, it promotes healing and cell regeneration.
Finally, it helps maintain normal psychological functions and a better mood, thanks to its role in the synthesis of neurotransmitters like dopamine. Sufficient levels of vitamin C are associated with reduced stress and mental fatigue.
Symptoms and causes of vitamin C deficiency
A vitamin C deficiency can lead to numerous symptoms: persistent fatigue, loss of appetite, muscle and joint pain, bleeding gums, or dry and fragile skin. In severe cases, it leads to scurvy, a historical disease linked to a complete lack of vitamin C intake.
The main causes are a diet poor in fresh fruits and vegetables, smoking, or certain digestive pathologies that limit nutrient absorption. Smokers are particularly exposed, as cigarettes decrease vitamin C levels in the blood.
Dietary sources of vitamin C
Vitamin C is found mainly in fresh fruits and vegetables. Here are some examples of foods rich in vitamin C:
- Citrus fruits (oranges, lemons, grapefruits)
- Berries (strawberries, raspberries, blueberries)
- Kiwi
- Papaya
- Mango
- Pineapple
- Melon
- Peppers (red, green, yellow)
- Broccoli
- Brussels sprouts
- Cauliflower
- Spinach
- Tomatoes
Since vitamin C is sensitive to heat and light, it is recommended to consume these foods raw or lightly cooked to preserve their content.
How to take your vitamin C?
How you take vitamin C depends on your sensitivity and needs. For some people, it acts as a stimulant: it is therefore preferable to take it in the morning or before training to benefit from its energizing effects. For others, it can, on the contrary, induce a slight relaxation—in which case, it is better to consume it in the evening.
For better assimilation, it is advisable to take it with meals or before a sports session, possibly in combination with other nutrients such as proteins or BCAAs. However, be careful not to exceed the recommended doses: an excess can have a diuretic effect and cause digestive discomfort.
Key takeaways
Essential for metabolism, cell protection, and the immune system, vitamin C is an ally for general well-being and athletic performance. A diet rich in fresh fruits and vegetables is often sufficient to meet daily needs, but a quality supplementation can be useful to maintain a good nutritional balance, especially for athletes, smokers, or tired individuals.