Vitamin D increases the need for vitamin K and magnesium. Vitamin K doesn't increase the need for vitamin D. Vitamin D is taken to maintain a higher serum level. For the calculator, assume it's currently 0 ng/mL.So if i take D lowers vitamin K in blood since it needs to use it? or is it other way around? I did not understand. I cannot take blood test yet since it might be expensive and i do not have money yet