Also, for cold sores, I heard olive leaf extract was very good ! It increases your energy levels a great deal, I am using it at the moment to help fight an infection. I just started some days ago, I feel very energized although I am experiencing some die off effects.
As for colostrum, I recommend buying from "immune tree" or from "Jarrows formula". You can find both of these brands on Amazon, and you can order from their websites as well (immune tree ships internationally from its website). I purchased from Immune tree.