11 Apr 2019 --- An adequate intake of certain nutrients is associated with a reduction in all-cause mortality when the nutrient source is food, but not supplements. This is according to a Tufts University study, which also identified that there was no association between dietary supplement use and a lower risk of death. However, supplement suppliers highlight that the “bold” findings must be approached with “caution,” as dividing products into “good” and “bad” categories can lead to doubt in the industry and cause confusion among consumers. The study also failed to differentiate between subgroups of vitamin K, which has led the industry to question some of its findings.