Hello, I am 41 years old and recently found out from a recent blood test that I have a very low level (5) of vitamin D in my blood. Doctor said she would call in a prescription for vitamin D that I would take over 8 weeks and repeat a blood test. I have yet to receive the prescription because doctor's order never reached the drug store and it's been two weeks of me trying to reach her to tell her to call it it again. Can I take vitamin D over the counter instead? And what would be the dosage?