I mix duck food and chicken food together, to make the duck food last longer. Ducks need more niacin and if they don't have enough they'll get issues with limping and such, so duck food has higher niacin content. Its most important for ducklings to get niacin since they're growing.
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I get my duck food from Chewy.com, but you can find it at feeds store and places like that. For older ducks (6ish+ months), you can get away with just feeding chicken food, but you'll want to add some niacin.
Brewers and nutritional yeast are commonly used. But you can also use Durvet High Level Vitamin B Complex, and mix that in a wet mash of feed, and give that a couple times a week.
Brewers and nutritional yeast are commonly used. But you can also use Durvet High Level Vitamin B Complex, and mix that in a wet mash of feed, and give that a couple times a week.