It is essential to maintain healthy vitamin D levels throughout all stages of life – from fetal development to old age. Vitamin D helps protect a number of important functions in the body. Because the amount of vitamin D needed to achieve minimum vitamin D sufficiency (commonly defined as a 32-ng/mL 25(OH)D blood level) or higher depends on many factors and can vary significantly from individual to individual, we offer one encapsulated vitamin D3 formula and two liquids.