1: Are you getting enough sun exposure?

2: Not eating sufficient vitamin D rich foods?

3: Neglecting supplements when needed.

4: Ignoring the importance of regular testing.

5: Being unaware of your specific needs.

6: Skipping fortified foods in your diet.

7: Overestimating the effectiveness of sunscreen.

8: Forgetting about the role of genetics.

9: Taking medications that deplete vitamin D.