Background Abstract Meta-analysis showed the effects of vitamin C 200+ mg/d on the incidence and duration of colds as a prophylaxis and duration of colds as a treatment. 1 minute PDF Download PDF Reference Douglas RM, Hemilä H (2005) Vitamin C for preventing and treating the common cold. PLoS Med 2(6): e168. Copyright: © 2005 Douglas and Hemilä. Locked On FAB action liks Share Messenger WhatsApp Copy Link Search On Register Off Save (for later) On Share it