If you are feeling a little down, maybe constantly finding yourself depressed. Or do you perhaps know someone that constantly looks glum? Then you might be suffering from depression, and THIS might be because of a lack of Vitamin D. Certain studies have shown that a deficiency in Vitamin D is very much linked with depression. My advise, if you're seriously depressed and can't think why, or if something bothers you much to much and/or makes you very anxious, go to your local doctor and ask for a Vitamin D level test. If you are suffering, then it's a simple fix of getting more sunlight, or vitamin D supplement tablets!