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From your query it is clear that that you are having depression and cervical pain
. Sometime depression and low mood itself can lead to neck pain due to muscle spasm.
and will relieve your symptoms, if they are due to vitamin deficiency
. It is safe. So, in my view you can continue it.
I hope this information has been both informative and helpful for you.
Wish you Good Health.
Dr. Ashish Mittal