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You can give activated food grade charcoal if that’s what it is We need a little history In my other comment I asked age and what feed and if you have been giving any niacin through nutritional yeast

How old are the ducks What have you been feeding them ? Do you supplement vitamin B complex for extra niacin or add nutritional yeast to the feed ? It kinda looks to me like niacin issues You need to get them 1ml of vitamin B compex over a small treat or directly through syringe so they get...