PROVIDED BY NATURE Vitamin D contributes to the normal functioning of the immune system and is needed to maintain healthy bones, teeth and muscles by aiding the absorption of calcium and phosphate. This is particularly important for women, whose bone density can rapidly decline with age. PERFECTED BY SCIENCE Earthlight is the only plant based, vegan whole food source of vitamin D. A patented production process allows Earthlight to deliver 40,000 IUs of vitamin D in a single gram. Vitamin D2 is considered the equivalent of Vitamin D3. PROVEN BY RESEARCH Vitamin D is designated as a ‘shortfall’ nutrient and current NICE guidelines recommend all adults living in the UK should be advised to take a daily supplement containing 400 international units (10 micrograms) of vitamin D throughout the year, including in the winter. 'Comparing D2 and Ds Isoforms - Jeremy Appleton, ND for PLT Health Solutions' "Both D2 and D3 are derived from natural sources. Functionality of the two isoforms is comparable when taken at nutritional and physiologic doses, vs pharmacologic doses." 'Newer study data indicates daily vitamin D2 as effective as D3.' Keegan R-J H, et al. Dermato-Endocrinology. 2013;5:1:165-76. 2000 IU/d of D2 from mushrooms was as effective as 2000 IU/d of D2 or D3 from supplements in raising and maintaining serum 25(OH)D concentrations.