Vitamin D plays an important role throughout life, beginning with fetal development.* Thorne's D-5,000 is NSF Certified for Sport®. Vitamin D supports a number of important functions in the body.* In addition to supporting healthy bones and muscles, it supports cardiovascular health and immune function.* Although direct sunlight provides natural vitamin D, many individuals of all ages, especially the elderly, do not get enough vitamin D from sunlight and their diet. Vitamin D supplementation can be of great benefit in these situations.* Thorne's Vitamin D-5000 contain no lactose or preservatives (BHA, BHT, sodium benzoate, etc) for individuals who are sensitive to those ingredients.**