Ascorbic Acid – Vitamin C: Effects and Requirements
Ascorbic acid is the chemical name for Vitamin C, an essential water-soluble vitamin with powerful antioxidant properties vital to human health.
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Ascorbic acid is the chemical name for Vitamin C, an essential water-soluble vitamin with powerful antioxidant properties vital to human health.
What is Ascorbic Acid?
Ascorbic acid is the chemical name for Vitamin C, a water-soluble vitamin that is essential for the human body. Since the human body cannot produce ascorbic acid on its own, it must be obtained entirely through diet or supplementation. Ascorbic acid is naturally present in many fruits and vegetables and plays a key role in numerous biological processes.
Biological Functions
Ascorbic acid performs a wide range of vital functions in the body:
- Antioxidant protection: Ascorbic acid neutralizes free radicals and protects cells from oxidative stress.
- Collagen synthesis: It is essential for the production of collagen, a structural protein found in skin, bones, cartilage, and blood vessels.
- Immune function: Ascorbic acid supports immune cell activity and strengthens the body's natural defenses.
- Iron absorption: It significantly enhances the absorption of non-heme (plant-based) iron in the intestine.
- Neurotransmitter synthesis: It is involved in the production of neurotransmitters such as noradrenaline.
- Wound healing: Ascorbic acid promotes tissue regeneration and supports the healing of wounds.
Dietary Sources
Ascorbic acid is found in high concentrations in a variety of foods:
- Rose hips, sea buckthorn, acerola cherries
- Bell peppers (especially red and yellow varieties)
- Citrus fruits (oranges, lemons, grapefruits)
- Broccoli, kale, Brussels sprouts
- Kiwi, strawberries, blackcurrants
Since ascorbic acid is sensitive to heat and light, foods should be prepared as gently as possible to preserve their vitamin content.
Recommended Daily Intake
The World Health Organization (WHO) recommends a minimum daily intake of 45 mg of ascorbic acid for adults. In the United States, the National Institutes of Health (NIH) recommends 90 mg per day for adult men and 75 mg per day for adult women. Smokers have an increased requirement due to higher oxidative stress. Pregnant and breastfeeding women also need higher amounts of ascorbic acid.
Deficiency Symptoms
A deficiency in ascorbic acid leads to characteristic health problems:
- Scurvy: The classic deficiency disease caused by vitamin C deficiency; characterized by swollen and bleeding gums, poor wound healing, skin hemorrhages, and extreme fatigue.
- Increased susceptibility to infections
- Fatigue and general weakness
- Joint and muscle pain
- Dry, flaky skin
Risk groups for deficiency include people with a restricted diet, smokers, older adults, and individuals with malabsorption disorders.
Medical Use and Supplementation
Ascorbic acid is widely available as a dietary supplement in various forms, including tablets, capsules, effervescent tablets, and powder. In medicine, high-dose ascorbic acid is administered intravenously in certain conditions, such as supportive cancer therapy or severe scurvy. When taking supplements, the Tolerable Upper Intake Level of 2,000 mg per day (as defined by the EFSA and the US Institute of Medicine) should not be exceeded.
Overdose and Risks
Ascorbic acid is considered very safe at normal dietary levels. However, very high doses (above 1,000–2,000 mg daily) may cause the following side effects:
- Diarrhea and gastrointestinal upset (osmotic effect)
- Increased risk of kidney stones (oxalate stones) in genetically predisposed individuals
- Gastrointestinal complaints such as nausea and stomach cramps
Interactions
Ascorbic acid can interact with various substances:
- It enhances iron absorption – used therapeutically in iron deficiency anemia, but may be problematic in hemochromatosis.
- It may influence the effect of anticoagulant medications (e.g., warfarin).
- High doses may affect the efficacy of certain cancer medications – consultation with a doctor is recommended.
References
- World Health Organization (WHO): Vitamin and Mineral Requirements in Human Nutrition, 2nd edition. Geneva, 2004.
- National Institutes of Health (NIH), Office of Dietary Supplements: Vitamin C – Fact Sheet for Health Professionals. ods.od.nih.gov
- European Food Safety Authority (EFSA): Scientific Opinion on Dietary Reference Values for Vitamin C. EFSA Journal, 2013;11(11):3418.
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