I've never given vitamin K. Usual recommendation is B vitamins, thiamine in particular, since Corid is a thiamine blocker/mimic. Honestly, most of the time that is not even necessary. If you want to supplement, a simple B complex (human tablets or capsules) that contains thiamine, or a poultry vitamin that contains thiamine is all you need. You can empty the capsule, or crush the tablet and sprinkle over a bit of moistened feed, so it will stick, or many poultry vitamins can be mixed in the drinking water. If they are all symptom free, and acting normally, you may not even need to do that.
