i've read that if you don't take enough calcium then to maintain blood level vit D causes calcium to be taken from bones. however, no clue about numbers. I drin

i've read that if you don't take enough calcium then to maintain blood level vit D causes calcium to be taken from bones. however, no clue about numbers. I drink two glasses of milk and get way more calcium than i need, is 4000 IU vitamin D high enough to warrant k2? what about body weight/composition, gender and my diet. Nutrition science is in middle ages for sure