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Vitamin D Is Created By The Body When The Skin Is Exposed To Sunshine For A Small Amount Of Time. Ultraviolet Light Stimulates The Conversion Of Vitamin D2 To Useful Vitamin D3. Certain Factors Such As Amount Of Melatonin, Lack Of Sunshine And Certain Lifestyles Can Diminish Vitamin D Within The Body. A Lack Of Vitamin D Can Show As Lethargy, Tiredness, Muscle Problems, Bone Pains And Mood Changes. Certain Health Problems And A Weakened Immune System May Be Assisted By Supplementation With Vitamin D.