This is a very interesting topic to me.
The website of the producer of X-Factor Gold has more detailed info on that product...
here
However the
Skate Liver Oil is the really interesting stuff there. Apparently Skate & Ratfish belong to the same family and their liver oils are the same color.
It seems recommended by multiple sources to use both of the above type of products along with raw milk & organ meats to accomplish remineralization. But I would be interested to hear of anyone's experience in seeking Factor X.