I have just noticed this special supplement. I have only briefly had a look - and at least some of the papers are accessible.
Vitamin D Special Issue
The Editorial Board of Endocrine Connections has commissioned the first special issue of the journal, covering the latest developments in the field of Vitamin D.
Led by Guest Editors, Professor Susan Lanham-New, Professor Martina Rauner and Professor Josef Köhrle, this special issue will provide clinicians and researchers with a comprehensive update on the latest developments in Vitamin D research from across the globe, through a series of reviews and recent research.
Thoughts from Editor-in-Chief, Professor Adrian Clark
“I am delighted to introduce this special issue celebrating the centenary of the discovery of the relationship between Vitamin D and ultraviolet light. Few topics better represent the ethos of this journal that seeks to promote the “connections” within and beyond classical endocrinology. To achieve this aim, and guided by our guest editors, we have been fortunate to recruit an outstanding series of world leaders who have provided excellent reviews of the state-of-the-art in the subject."
Low Vitamin D and hypothyroidism
Losing hope with vitamin D 
Gabapentin and Vitamin D
