I use the same niacin that I take as a supplement for the ducks.
Regular, as opposed to the non flushing variety.
Humans manufacture niacin from tryptophan, meaning that B3 really isn't officially a vitamin for us. However, it's at a rate of about 500mg of tryptophan for 3mg of niacin, which...
Keep an eye on her and try not to worry too much. Never hurts to supplement niacin (B3) either. Today is the first day in a week that I didn't have at least one duck with a slight limp.
Two weeks ago, Pocahontas was actually laying down after taking seven steps, so she got some indoors time...