Agree ko sa nag suggest sa Vitamin C. I'm no doctor pero IMHO ug basa2x sa mga health tips kay maayo gyud to have your daily prescribed dose of Vitamin C. Based on personal experience kay dali rako mo develop ug runny nose after molangoy ug swimming pool, pero after having a daily prescribed intake of Vitamin C kay no more runny nose kada human langoy. Mas dugay nasad ko takdan mga sakit2x.