Is there any specific niacin tablets I should be buying for my 2 year old duck or just buy any? And do all niacin tablets dissolve?
You want to buy plain niacin not flush free or time released, it is said you have to ask for it because they keep it behind the counter, why I have no idea. and I think if you crush the tablet real good and mix with water it will probably dissolve better.

It's just plain Niacin 100mg per tablet, so I put 1 tablet to a gallon of his water every other day now that he's doing better. The supplement I found for poultry had a list of other vitamins with the Niacin so I worried about giving him more of something than he needs. Now he just gets this along with his feed and foraging and is showing remarkable improvement after 5 days.