Dr Paige talks about the importance of Vitamin D as a daily vitamin 

Vitamin D helps to achieve a therapeutic or an ideal clinical level to promote bone formation and enhance immune function. You can eat too many calories and still be vitamin D deficient. We recommend our own supplement Regenevita RegenaDULta. RegenaDUltra furnishes your body with an ultra-concentrated 10,000 IU (250 mcg) dose of vitamin D. Our blend supports the absorption of vitamin D with the additions of vitamins K1, K2 and geranlylgeroniol (GG). This formulation creates a powerhouse for your bone, immune, and cardiovascular health. We've also added quillaja extract and medium chain triglycerides (MCTs) in a combination that boosts bioavailability - so you receive the maximum benefit possible.