Dr. Robert Schuelt who heads the MedCram channel on YouTube recommends that anyone living above the border with Mexico should be taking between 3000-5000 mg of D3 daily. Unless you're outdoors an hour or more a day, shirt off, between October and March in the USA, you're not getting enough D3, not from food, not from fortified dairy.

Watch K vitamins, though. They affect clotting, and if you're already on a DOAC or taking warfarin, you will undo the treatment those are meant to impart to you.