I can’t comment on the Wellman vitamins as I haven’t used or checked out their ingredients. But I have both used and checked out the ingredients of MoreEPA Fish Oil Capsules and Viridian Multi Vitamin and mineral formula.
When it comes to cod liver oil or fish oil supplements, the thing you really need to look for is a high EPA and DPA per capsule. Also be mindful of capsules that require you to consume 2, 3 sometimes even 4 capsules per day, in order to be consuming the daily recommended dose.
As for vitamins, avoid the cheap supermarket own brands particularly. These tend to contain lots of fillers and low grade, low percentage vitamins. The Viridian range is also vegan and vegetarian approved.