It could be candida being eliminated if the colostrum is helping to re-balance the bacteria balance in your body. If it is candida, you should probably go slow with the changes you implement to improve your digestive system and gut balance because too much kill-off of candida at once can produce a severe reaction when it is eliminated. Candida releases toxins when it dies.
My guess is either candida or allergies, but allergies seems less likely. I use the same colostrum supplement and it has lactose removed to reduce chances of allergies or inflammation developing.
btw, just fyi when ...
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