Hey Andy and Wendell,
Thanks for the replies guys...
Wendell,
Goos question about getting them out in full spectrum or natural sunlight...
I would think that them being diurnal reptiles, hognose snakes would need to produce vitamin D3 by basking in UV in order to process calcium...
Offering a D3 supplement would solve the problem with not getting them out in the sun but I would be very careful about the ammount offered... D3 is a fat soluable vitamin and if allowed to build up in high levels it can cause some serious health issues...
A side note...
Vitamin D3 is not even an actual vitamin... It is actually a broken bond steroid known as a secosteroid...