Vitamin D

With all the studies coming out linking Vitamin D deficiency to everything from ongoing musculoskeletal pain, frequent or intense colds and flu, neurological symptoms such as depression and impaired cognition, headaches, unrelenting fatigue to head sweating. Not to mention studies showing that optimizing your vitamin D levels may help you prevent
cancer, heart disease, autoimmune diseases, infections, neurodegenerative diseases, and much more.

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I think it is well worth your while to know your Vitamin D level and keep it optimized