Niacin question

I was using the brewers yeast for humans from Walmart but it didn’t do anything to help this one duckling. I have no immediate access to direct niacin due to being out in the boonies. Takes 45 minutes to get to Walmart and 25 minutes to get to the feed store. I’m stuck with what I got unfortunately.
What's the niacin content of your yeast?
 

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