When the TGA licensed our Cod Liver Oil in 1991, the amount of Vitamin A and Vitamin D was regulated at a dose of 2,500IU of Vitamin A and 320IU of Vitamin D per 4mL. We selected 4mL as our standard dose because in 1987 the 5mL metric teaspoon was hardly known and everyone had a kitchen teaspoon that measured about 4mL.

For much of the year, Cod Liver Oil contains natural concentrations of Vitamin A & D in the above amounts, however, in early spring, the Vitamin A & D levels increase quite significantly. In order to reduce the Vitamin A & D to the regulated levels, a certain portion of the Vitamin A & D is removed by molecular distillation.

In late autumn and winter, the natural levels of Vitamin A & D are at their lowest, and it is necessary to top up the amount in our Cod Liver Oil with the previously retained Vitamin A & D in order to meet the respective regulated levels.