Vitamin C (ascorbic acid) accumulates in phagocytic immune cells such as neutrophils, helping them engulf and destroy pathogens while protecting host tissue from oxidative damage. It is a cofactor for numerous enzymatic reactions involved in collagen synthesis and immune cell proliferation.
Clinical Summary
A landmark Cochrane systematic review found that while daily Vitamin C supplementation does not prevent the common cold in the general population, it consistently reduces the duration and severity of cold symptoms.
Dosage Guidelines
500mg to 1,000mg daily; the body excretes excess amounts since it is water-soluble.
Safety & Side Effects
Generally well tolerated; higher doses (several grams) may cause mild gastrointestinal upset such as diarrhea.
Known Interactions
High doses may interfere with certain lab tests and can theoretically affect iron absorption; no major drug interactions at standard doses.
Medical Disclaimer
The information provided in this clinical review is for educational and informational purposes only. It is not intended to be a substitute for professional medical advice, diagnosis, or treatment.
*These statements have not been evaluated by the Food and Drug Administration (FDA). This product or ingredient is not intended to diagnose, treat, cure, or prevent any disease.
Always consult your physician or other qualified health provider with any questions you may have regarding a medical condition, or before beginning any new diet, fitness, supplement, or treatment regimen, especially if you have pre-existing medical conditions or are taking prescribed medications.
