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Viacutan appears only to contain omega-6 no omega-3 which is equally essential, the balance between omega-3 and omega-6 is just as important as the quantity in the diet. Too much omega-6 is actually inflammatory, it's omega-3 that has the anti-inflammatory properties.
Udo's choice is good but being vegetarian not as good as fish oil - humans only convert 5-10% of the Omega-3 from vegetarian sources, we use most of the omega-3 from fish. I am not not convinced by your health food store man,
Mark, it is perfectly acceptable for humans to get their omega-3 from canned oily fish which has been heated and pressurised. My understanding is that short chain polyunsaturates such as those in flax are very delicate but the long chain ones are more resistant to heat. Speaking personally I have taken the H&B high strength fish oils for a couple of years and my skin cleared up (eczema/ contact dermatitis), why I stopped I will never know.