Total score of 7 or less
It’s likely that you are not getting enough vitamin D. Many experts consider this amount too low for optimal health. Since it will be hard to reach the recommended daily amount of vitamin D through your diet alone, you probably need a supplement.
You should aim for 20 mcg daily, preferably the vitamin D3 form (check the label). In some cases you will need 25 mcg daily, especially in wintertime. Aim for this amount if one of the following discriptions is applicable for you: you are over 50, darker skinned, spend a lot of time indoors, or spend time outdoors with your head and hands covered.