Vitamin C Supplements
Support immune function, collagen synthesis, and antioxidant protection
Forms
Tablets, capsules, chewables, powders, liposomal; ascorbic acid or buffered sodium ascorbate
Advantages
Inexpensive; well tolerated; may modestly reduce cold duration
Disadvantages
High-dose megadosing has limited extra benefit beyond saturation; water-soluble so excess is excreted
Side effects
Diarrhoea and stomach cramps above 2000 mg/day
Interactions
May increase iron absorption when taken together; can interact with certain chemotherapy agents
At-risk groups
Smokers, people with low fruit and vegetable intake, those with frequent colds
Cautions
Caution in people prone to kidney stones due to an oxalate metabolite
Related symptoms
Educational information only — not medical advice. This content does not diagnose, treat, or replace consultation with a qualified healthcare professional. Always seek professional medical advice for symptoms, supplement use, or health concerns.