Vitamin D is a major vitamin for bone development, mental health and maintenance. You get it from sun exposure, oily fish, liver, egg yolk, and supplements. Here are the symptoms of its deficiency.
Vitamin D deficiency can cause poor sleep and stress on the immune system, which can cause fatigue.
As Vitamin D helps the body absorb calcium, its deficiency can make bones soft and cause pain.
Without enough calcium, muscles won't function right and will repair slowly after activity.
Vitamin D is needed to regulate the 'feel-good' hormone serotonin. Its deficiency can even cause brain inflammation, causing anxiety and depression.
It's another side effect of poor calcium absorption and misaligned joints, as soft bones can't hold joints properly.