At least IF you are going to take cod liver oil you should take 5000 IUs a day of vitamin D.
Better yet take only the vitamin D supplement and get your vitamin A from eating foods high in vitamin A.
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A study published in year 2004 showed that cod liver oil and a multivitamin slightly reduced mean number of respiratory infections in children, but the total number of doctor visits for these infections was slightly higher in the cod liver oil/multivitamin group (68 versus 61). The 1930s study demonstrated far superior benefits with cod liver oil.

One difference between these studies is that cod liver oil in the 1930s study had more vitamin D. The other issue is that children in the 2004 study received 3,500 IU of preformed vitamin A (not beta-carotene) and only 700 IU of vitamin D.

Given what we now know, a more appropriate dose should have been 500-1,000 IU of vitamin A (instead of 3,500 IU used in the 2004 study) and 2,000-3,000 IU of vitamin D3 (as opposed to 700 IU used in the 2004 study).
Excess Vitamin A Can Thwart Vitamin D

Vitamins A and D compete for each other’s function in the body. Preformed vitamin A, found in excess amount in many commercial supplements, can thwart vitamin D’s protective effects. This is not an issue with beta-carotene, as it converts to vitamin A in the body only on demand.

Consumption of excess preformed vitamin A, as found in commercial multivitamins and modern cod liver oil, may cause bone toxicity in those with inadequate vitamin D status. One study showed that women with the highest intake of preformed vitamin A had 2.1 times more hip fractures. A meta-analysis found that people who took preformed vitamin A supplements had a 16% increase in overall mortality, perhaps through antagonism of vitamin D.
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Also from Dr. Joel Fuhrman:
Are there any problems with taking supplements?
The main problem with taking a typical multivitamin is that it may expose you to extra nutrients that you do not need. Sometimes too much of certain nutrients can have toxic or harmful effects. For example, I do not recommend taking supplements that contain vitamin A, isolated beta-carotene, or iron, because there are risks associated with consumption of these nutrients above what we receive in our diet.

Ingesting vitamin A or beta-carotene in isolation–from supplements, instead of from food–may interfere with the absorption of other crucially important carotenoids, such as lutein and lycopene, thus potentially increasing cancer risk. 1

The precursor to vitamin A, beta-carotene once was regarded as a safe and beneficial antioxidant and even recommended as an anti-cancer vitamin, but it has recently been shown to increase the risk of certain cancers when administered as an isolated supplement. Scientists now suspect that problems may result when beta-carotene is ingested without other carotenoids that would have been present had it been ingested from real food. Beta-carotene is only one of about 500 carotenoids that exist. Beta-carotene supplements are poor substitutes for the broad assortment of carotenoid compounds found in plants.

http://www.lef.org/magazine/mag2010/jan2010_Startling-Findings-About-Vitamin-D-Levels-in-Life-Extension-Members_02.htm
http://www.diseaseproof.com/archives/supplements-dr-fuhrman-discusses-vitamins-and-supplements.html

I’m currently running a giveaway to win a bottle of Fermented Cod Liver Oil (osolo orange) from Green Pastures!

Anyone can enter as long as you are an Australian Resident!

You can go here to enter: http://healthfoodlover.com/hfl/2010/09/happy-1-year-health-food-lover-csn-store-giveaway-jaffa-cake-recipe-jaffa-frosting/

(The giveaway is in the middle of the post).

Good luck!

“………Recent research also revealed, that the transformation humans underwent when apes became intelligent and turned into humans happened only in coastal regions, where the apes started to consume large amounts of fish. Why not benefit from that knowledge and consume more fish oil?…….”

Scotty Logan

I also once watched a special on BBC about people with depression. It showed the Atrophy of the Brain tissue in this person before the protocol then showed the vast improvement after the protocol. The protocol was feeding the depressed person Fish Oil (not sure if it was Cod Liver Oil) for 9 weeks and also Free Range Fresh Eggs from chickens that had been eating a Green plant called ‘Leutin’ i think. What remarkable results . . . . . can’t find this footage anywhere .