There is a large population that suffers from vitamin D deficiency during the fall and winter months. If you feel you have a vitamin D deficiency, the symptoms are here:
Vitamin D insufficiency can cause persistent and/or repeated muscle pain, particularly in the hamstrings and rotator cuff in the shoulders.
Lower levels of vitamin D have been linked to alopecia areata, an autoimmune illness characterised by dramatic hair loss from the head and body.
Vitamin D is also essential for maintaining a healthy immune system, so if you are constantly battling diseases such as the common cold, you may not be getting enough of it.
Regardless of how much sleep you receive, are you exhausted and worn out? A vitamin D shortage may be to blame if this ailment is more frequent in the winter.
The "happiness hormones" serotonin and dopamine are produced in part by vitamin D. In the absence of these, you may be more depressed than usual.
1) People with dark-colored skin
2) Elder People
3) Pregnant Women