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Vitamin C for colds — the evidence
The Cochrane evidence: regular vitamin C does not prevent colds in the general population, and starting it after symptoms begin does not shorten the cold. It may shave a little off the duration for people under heavy physical stress (marathoners, soldiers in winter training).
Ce que disent les preuves
Verdict: No clear evidence. The Cochrane evidence: regular vitamin C does not prevent colds in the general population, and starting it after symptoms begin does not shorten the cold. It may shave a little off the duration for people under heavy physical stress (marathoners, soldiers in winter training).
Quoi faire vraiment
An orange is always fine; megadosing at the first sniffle is not the lever. What actually matters is what vitamin C supports generally — a normal diet covers it, and deficiency in this region is rare.
Source: Cochrane — vitamin C for preventing and treating the common cold (CD000980) · checked 2026-09-07
Référence d’autosoins, pas un avis médical. Enfants, adultes plus âgés, grossesse et quiconque avec une maladie de longue durée devraient avoir un seuil plus bas pour appeler un clinicien. Symptômes graves ou qui s’aggravent, gêne à respirer ou confusion : obtenez de l’aide médicale.