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You're likely hampering your training gains with Vit C (there's also evidence against the other common antioxidants).
http://ajcn.nutrition.org/content/87/1/142.full
"The administration of vitamin C significantly (P = 0.014) hampered endurance capacity. The adverse effects of vitamin C may result from its capacity to reduce the exercise-induced expression of key transcription factors involved in mitochondrial biogenesis."
hippy
danb
zinc + vit C
It seems that zinc in particular is particularly effective at reducing the symptoms / length of the common cold and there is some evidence to suggest that the intake of zinc in the general population is less than it should be.
Good dietary sources of zinc are: shellfish and red-meat
Oysters are a massively good source of zinc, Beef is pretty good
http://ods.od.nih.gov/factsheets/Zinc-HealthProfessional/