Thanks for sharing this is very helpful

but we should also remember not all amphibians are the same and their needs for UVB will differ. Large predatory frogs can get D3 from a diet that includes whole prey items like fish, mice, lizards or other frogs. There's just not enough evidence to support that all frogs need UVB, but they have been raised without for years and many have fared well. With such success, I highly doubt keepers or breeders will or should have to change their ways until more research on each species has been done. Most of the studies I have seen have been doing on small frogs that feed on insects (which naturally lack D3) or basking species.

Yes, some develop MBD and they might not have had UVB, but was this the cause or inadequate supplementation and gutloading of insects, lack of variety or wrong temperatures?