From my studies - I believe hepatitis is often viral in nature but also can be caused by toxins. I have never heard of hepatitis being directly caused by a nutritional deficiency. But I have not studied too much about the causes! I've never had a bird with this disease.Finchly, now.. you know, if you have any evidences that the hepatitis could be caused by a nutritional deficiency, please, let me know, thanks.
I'm rearranging the sentence with rancid: Another choice is cod liver oil, but it It goes rancid (spoils, ruins) quickly so only mix what they will eat in a short time. Stir a little into their seed mix.
(sorry! My typing can't keep up with my brain.)