How much vitamin D should I take?

Gary Brecka recommends taking at least 5000 international units (IU) of vitamin D3 daily, alongside 120 to 140 micrograms of vitamin K2 to ensure proper calcium regulation and prevent arterial calcification. This dosage is often considered more effective by functional medicine practitioners than the standard recommended daily allowance. He suggests aiming for vitamin D3 blood levels between 60 to 80 nanograms per deciliter as an optimal range 1 2. It's important to check your vitamin D3 levels through blood tests to ensure they are within this optimal range.