No one has mentioned reptile lamps yet? Medical UVB is expensive and probably can't be bought without a license of some sort. Reptile lamps you can buy from a l

No one has mentioned reptile lamps yet? Medical UVB is expensive and probably can't be bought without a license of some sort. Reptile lamps you can buy from a local pet store or online. But nothing beats the real sun (and greenery and fresh air), obviously. Given that the discovery of Vitamin D, heck the whole concept of vitamins even, is relatively recent, we really don't know what else we don't know.