Originally Posted by GRB5111

Of course, with any answer, it's always got a lot to do with you. Since research shows that vitamin D is essential for many functions, I always take it as a D3 supplement. If I've been outdoors in the sun, I may skip a dose of the D3, but usually take it every day in the winter. I also take a highly absorbed Magnesium Citrate and a high-quality Vitamin K2. This is just me, and the Magnesium eliminates muscle cramping during workouts. From this experience, I believe I need to stay consistent with magnesium supplementation. Vitamin K2 moves the calcium I get from my WOE to where it is most useful (bones) and keeps it away from where I don't want it (arteries). I eat a nutrient dense diet otherwise, so I don't use a multivitamin or take any other supplements. YMMV.