The only blood test that can diagnose vitamin D
deficiency is a 25-hydroxy-vitamin D
(25 OH vitamin D
). Unfortunately, some doctors are still ordering the wrong test, 1,25-dihydroxy-vitamin D.
Magnesium is essential, you need to take it with your D3. Take D3 with some sort of fat (like coconut oil, avocado, peanut butter, etc. it helps D3 & K2 absorb). Take D3 in morning or afternoon. Not at night. It may keep you up.