The two forms of Vitamin D supplements are D2 and the more potent D3. Health Origins® Vitamin D3 2,400 is key nutrient manufactured in a highly absorbable liquid softgel from. Vitamin D3 is synthesized in the body from sunlight and only a small amount can be obtained from food. The winter season and most all sunblock products inhibit the body’s ability to produce optimal levels of Vitamin D. As a result, Vitamin D3 supplementation becomes even more necessary to ensure your body receives an adequate supply.