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I saw the cosmetic section of a local online shopping site in my country sells niacin powder. I think it is intended for making beauty products.... Should I buy these to my ducks. These powders are cheaper than brewer's yeast. Brewer's yeast is very pricey in my country: How many tablespoons...

A 4 week old muscovy of mine ends up having Niacin deficiency. It doesn't want to eat and drink. It can stand and walk but it prefers to sleep. due to lockdown I can by poultry supplies. I use Polyvisol to give it source of niacin and vitamins. I see improvements but it is still weak. It...