When it comes to cod liver oil I have been asked what the difference is between it and fish oil. The answer is that cod liver oil has vitamin D and vitamin A in it, whereas Fish oil does not. I take fish oil because it is possible to overdose on the vitamin A in cod liver oil if you take too much. One Tablespoon of cod liver oil contains 13,600 IU of retinol and other natural forms of vitamin A which is well above what I want.
On the other hand, Beta Carotene is far safer because your liver converts it to vitamin A on an as needed basis (just as God designed) so you will never overdose. Beta Carotene is in many supplements (including Multi-Wow) as vitamin A and is the precurser to Retinol, not Retinol itself, therefore it is safer. If you want to eliminate your chances of overdose I would take fish oil and then supplement with Multi-Wow which only has Beta Carotene as vitamin A.