06 Jul 2017 --- A groundbreaking study from the University of Surrey has dispelled the myth that vitamin D2 and D3 have the same nutritional value, raising serious questions marks with regards to official guidance around vitamin D. This finding not only has implications for the health sector but also for the retail market. In the belief that it will help a person fulfill their daily intake, many retailers have over the past few years added vitamin D2 to their products. This study, however, has proven that D3 is the most effective form of increasing vitamin D levels in the body.