I have questions around the contained vitamin D?

A daily dose, 1 tablespoon/8 ml, contains 2000 mg of omega-3 and 20µg of vitamin D3/800 IU.

The vitamin D3 comes from sheep’s wool and is added afterwards in our Omega-3 Total, because the unavoidable step of purifying the fish oil, also removes the vitamin D of the fish from the fish oil.