A lot of Zoos use Rocksolid Herptoculture products but if you read the fine print they recommend a rapid turnover of the product. (I'll have to look into that some more).

Many people also use Rep-Cal and Herpetovite and mix them so the ratios are correct (as it says on the directions). These should be discarded and replaced at least every six months.

With Bufonids, there is some indications that some species do not efficiently convert beta carotene to retinol and can result in some toads developins hypovitaminosis of A..

Ed