The hype around Vitamin D supplementation has waxed and waned over the years in the lifting community, but has overall, landed in a place where it’s more or less universally seen as a positive supplement. But what is the state of the data? What can you expect as a lifter out of vitamin D supplementation? How do you measure vitamin D status, how reliable are these measures, and should we even be measuring it? The answer probably differs at the population and individual levels. We’re joined by Dr. Niamh Aspell of Sigma Nutrition who did her Ph.D. on Vitamin D as well as Austin Baraki, MD from barbell medicine who deals with this on a clinical level on a regular basis to answer these questions.