Bio-D-Mulsion Forte supplies 2,000 IU per drop of vitamin D3 as a micro-emulsion for enhanced absorption and utilization. The majority of people in the US do not synthesize sufficient vitamin D in order to meet normal physiological requirements. Published clinical studies have demonstrated significant improvements in 25(OH)D concentrations (202% increase) in as little as six weeks after beginning supplementation with Bio-D-Mulsion Forte