Vitamin C for Allergy Relief
Vitamin C degrades histamine and acts as an antioxidant in airway epithelium. Trials in allergic rhinitis show small reductions in symptoms at 1–2 g/day; it is a reasonable low-risk adjunct, not a primary treatment.
Overview
Verdict
Vitamin C has mild antihistamine properties; trials show small symptom reductions at higher doses.
How It Works
Dosing & Protocol
Typical dose
- Recommended dose
- 1–2 g/day in divided doses.
- Expected timeframe
- 2–4 weeks.
Protocol
- form
- Ascorbic acid, or buffered sodium/calcium ascorbate if plain ascorbic acid causes stomach upset
- duration
- 4-8 weeks through the allergy season
- co factor
- Take with food in divided doses, since absorption saturates above about 200 mg per dose. Evidence is mixed and thin. Vitamin C has antihistamine-adjacent properties in vitro - it appears to reduce histamine release from mast cells and may accelerate histamine degradation, and blood histamine falls with supplementation in some studies. A German observational study of high-dose intravenous vitamin C at 7.5 g reported reduced allergy symptoms, but it was uncontrolled. Oral trials are few, small and inconsistent, and no adequately powered randomised trial supports vitamin C for allergic rhinitis or other allergic conditions.
- titration
- Up to 2 g/day in divided doses; the tolerable upper intake level is 2,000 mg/day for adults
- starting dose
- 500 mg twice daily with food
Evidence
No studies are yet linked to both Vitamin C and Allergy Relief.
Safety
Caveats
Doses above 2 g/day commonly cause loose stools. Oxalate kidney stone risk at high chronic doses in susceptible individuals.
Less likely to help if
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.