Uvb and D3

[Diver]

Most frog keepers are catching on luckily Monkey Business, and as Jason said there's only one place they get D3 from in the wild and it isn't from diet. The days of over-reliance on supplements ought to be behind us, supplements are there to fill in the gaps of what we are not able to provide in the captive environment, not a beginning point and with the ready availability of UVB bulbs now we don't need to be relying purely on unnatural artificial dietary means.

I'm sure UVB bulbs aren't as good as natural sunlight, but they are a close second. I see from your location that you are lucky enough to have a ready supply of the real thing!