It is obvious from what has been written above that both vitamin D2 and vitamin D3 are available for fish in their diet, however vitamin D2 is almost absent in fish. The only
form of vitamin D that has been identified at significant levels in fish oils (both body and liver) is vitamin D3. This is also supported by the work of world famous vitamin D
researchers including Dr Michael Holick who has never found vitamin D2
(ergocalciferol) in cod liver oil or other livers oils including flounder, red fish,
mackerel, eel, and mullet liver oils. In addition, similar results have been obtained by the Institute of Aquaculture, Stirling University who have sampled fish livers and a great deal of unrefined fish liver oils over many years.
This article applies to: Rosita Extra-Virgin Cod Liver Oil (EVCLO).