Kosher Fish Oil

I have been suffering from a severe allergy condition for a number of years. It has affected my breathing and overall physical condition in a very profound way. Conventional medicine has not been able to do very much, as the side affects at times outweigh the benefits of the medication. I have been trying the non-conventional route for some time now, and my practitioner is urging me to try taking a very powerful Omega-3 oil supplement, which may be the answer. This fish oil, however, is not kosher, as a significant percentage is from the liver of a shark. Although the shark it’s derived from does have scales, so maybe it is kosher as it has fins and scales? If it is, great, if not, what could I do – is there a way to take this oil if I keep kosher?