There's no easier way to supplement your natural vitamin D intake than with Super Daily D3 from Carlson. You get 25 mcg (1,000 IU) per drop of D3, which is an essential vitamin for good health. The "Sunshine Vitamin" can be produced in your body when your skin is exposed to sunlight under the proper conditions. Sadly, in today's modern world, many people don't get out enough so supplementation is key.