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Our understanding is that thru water, they need 55 mg a day of niacin... not trusting the feeds niacin content or the stated niacin content(in the feed). We also have a secondary source that says human niacin causes tumors in waterfowl... what do you think?

The other niacin source is some sort of poultry vet site that compares feeds.

I am raising Indian Runners. So are you saying that I should use 500 mg human niacin capsuls that you can buy on amazon for the runners (they are a lightweight breed).

I use a duck and chicken feed brand called 'Scratch and Peck Feeds'. On its website it says the grower feed (which my ducks are on- they are 6 weeks old now) has sufficient niacin levels; but when I looked on a separate site (that was not scratch and peck's website) it said it did not have...