The Rx concentrations are higher and generally cholecalciferol instead of ergocalciferol which is less absorbable and not as long-lasting. It’s fine to try it

The Rx concentrations are higher and generally cholecalciferol instead of ergocalciferol which is less absorbable and not as long-lasting. It’s fine to try it out. What I’m casting doubt upon is the blood test of Vitamin D levels and whether low levels are even an indicator of a problem. In my case I had very very low blood levels of D and was prescribed supplements and sun exposure. Years later, I found out I actually have a form of sun allergy. As mentioned, YMMV.