With the widespread availability of herbal supplements and the general turning away from uneccesarily perscribed medications, we need to be even more careful to avoid treif items. Although we are accustomed to the constant onslaught of unkosher recommendations by the nations, combinations of items, processing, and renaming can disguise the usually well known avoidables. Krill oil next to cod liver oil, catfish next to cod, and etc. We have to remember that the reason these foods are forbidden by HaShem will not always be immediately apparent to us. It's always good to go over those items that we're forbidden again to refresh our memories! Rather than post it all here again, I'll direct you to a link at Wikopedia that discusses the matter in a well organized format already: