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Vitamin C – Antioxidant, Immune Protection, and Collagen Synthesis
What is Vitamin C?
Vitamin C (ascorbic acid) is a water-soluble vitamin and one of the most important antioxidants in the human body. It is essential – humans are one of the few mammals that cannot synthesize Vitamin C themselves, as the crucial enzyme L-gulonolactone oxidase became inactive during evolution. Therefore, Vitamin C must be consumed daily through diet.
Despite its ubiquity in supplements, Vitamin C is often underestimated: It is not just a "cold preventative" but a central molecule in hundreds of biochemical reactions.
Biochemical Roles of Vitamin C
Antioxidant and Free Radical Scavenger
Vitamin C is one of the most potent water-soluble antioxidants. It neutralizes reactive oxygen species (ROS), thereby protecting cell membranes, DNA, and proteins from oxidative damage. After intense exercise, ROS production is increased – Vitamin C helps limit oxidative stress. Important: Very high post-workout doses can attenuate training-induced ROS signaling (which is necessary for adaptations) – moderate doses are better here.
Collagen Synthesis
Vitamin C is indispensable as a cofactor for prolyl and lysyl hydroxylase – these enzymes stabilize the collagen triple helix. Without Vitamin C, no functional collagen formation is possible (this is the mechanism behind scurvy). For athletes and anyone taking collagen supplements, sufficient Vitamin C is therefore essential.
Immune Function
Vitamin C accumulates in immune cells to very high concentrations (10–50× higher than in plasma) and supports the function of neutrophils, lymphocytes, and macrophages. It stimulates the production and function of antibodies and interferons. Studies show: Vitamin C does not reliably reduce the duration and severity of colds in the general population, but it does in individuals with high physical exertion (marathon runners, soldiers).
Iron Absorption
Vitamin C increases the absorption of non-heme iron (plant-based iron) from the intestine by up to threefold by reducing Fe³⁺ to more absorbable Fe²⁺. For vegans and vegetarians, taking Vitamin C simultaneously with iron-rich meals is particularly important.
Neurotransmitter Synthesis
Vitamin C is a cofactor for dopamine β-hydroxylase (norepinephrine synthesis) and for carnitine biosynthesis (fat burning). Sufficient Vitamin C is thus also relevant for energy metabolism and psychological stability.
Vitamin C and Sports
| Application | Evidence | Recommendation |
|---|---|---|
| Immune protection under high stress | ⭐⭐⭐⭐ Well-supported | 200–1000 mg daily |
| Collagen synthesis (pre-training) | ⭐⭐⭐⭐⭐ Very well-supported | 50 mg 1h before training with collagen |
| Muscle soreness reduction | ⭐⭐⭐ Moderately supported | 1000 mg daily |
| Post-workout antioxidant | ⭐⭐ Double-edged | Prefer moderate doses |
Dosage
| Goal | Dose | Timing |
|---|---|---|
| Basic supply | 100–200 mg | Daily, flexible |
| Immune support | 500–1000 mg | Daily, divided |
| With collagen | 50–200 mg | 30–60 min before training |
| Upper limit | Max. 2000 mg/day | Higher → diarrhea possible |
Absorption: Vitamin C has saturable absorption – above 200 mg/serving, the percentage of absorption decreases. Several small doses throughout the day are more effective than one large single dose.
Vitamin C Forms
- Ascorbic acid: Inexpensive, effective, acidic (can cause stomach problems in sensitive individuals)
- Sodium ascorbate/Calcium ascorbate: Buffered, gentler on the stomach, slightly less acidic
- Liposomal Vitamin C: Higher bioavailability due to liposomal encapsulation – more expensive, but useful for high doses
- Ester-C: Calcium ascorbate + ascorbate metabolites – moderate proven benefit, more expensive
Frequently Asked Questions (FAQ)
Does Vitamin C protect against colds?
In the general population: Hardly. With regular intake, it minimally reduces cold duration (~8% in adults). In high-performance athletes and under extreme stress: Yes, a significant reduction in cold risk by up to 50%.
Is Vitamin C harmful in very high doses?
Water-soluble, excess is excreted by the kidneys. Very high doses (>2g/day) can promote renal oxalate stones in sensitive individuals and cause GI discomfort.
Related Terms
Collagen · Iron · Zinc · Vitamin D3
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