Anxiety
According to research, there is a strong link between vitamin D deficiency and anxiety. For six months, participants in one study were given vitamin D supplements. The Hamilton Anxiety Rating Scale 14 was used to assess participants' levels of anxiety. One group received no vitamin D supplements at all. Finally, vitamin D supplements significantly reduced anxiety symptoms in the group compared to the control group.
A study published in the Journal of Diabetes investigated whether supplements could improve mental health and type 2 diabetes. For six months, 46 women took part in the study and completed a survey about their mental health. The study discovered that taking vitamin D supplements significantly reduced anxiety levels in women with type 2 diabetes. Another study discovered that people who were anxious had lower levels of calcidiol. Calcidiol is a byproduct of vitamin D breakdown. The study also mentions that ancient literature suggests a link between vitamin D deficiency and anxiety.