Niacin is B3, how about Brewers Yeast you can buy it at natural food stores i like it even better. ! tab to 1 cup of feed. How old is your duck? have you checked bottom of the feet for bumble, cuts splinters? see any swelling in the legs?Can I give my ducks b3 instead of niacin?
One of my ducks can't walk and I don't know Where to buy the right niacin since Walmart doesn't have it.