okay I am reading a lot of studies on preformed vitamin A in the Cham world. And everything I read is making me uneasy. I was always told to stay away from preformed vitamin A because of the extreme health consequences. But now I hear that keepers give their Chams preformed A occasionally. I only use one Multivite and it just has beta carotene in it and I am being told the beta-cartene does not propeprly convert to Vit A in Chams. I am really interested in trying preformed Vitamin A with caution, but how much? How often? and what brand / supplement do others use on here?