Almost all living creatures have the ability to develop vitamin D3 from UVB exposure and do so automatically when they are exposed to ultraviolet. Many reptiles develop all their D3 from the exposure to UVB in their natural habitat. The natural production of D3 under UV light is a self limiting process. Because our Mega-Ray® mimics a piece of real sunshine, we strongly recommend not using any D3 supplements. Our extensive blood serum 25-OH-vitaminD3 testing has shown that supplementing D3 is completely unnecessary while proper UV levels are maintained. It should also be noted that when normal D3 levels are present in the blood stream, the body has the ability to metabolize all the calcium that's needed from the normal diet and in most cases if the animal is being fed a high calcium diet, calcium supplements aren't necessary.

If you have doubts about the sufficiency of the calcium in your animal's diet or you have a juvenile or gravid animal and feel its best to supplement calcium, we highly recommend the Rep-Cal brand Calcium, No VitD3, Phosphorus Free only for use with our bulbs.