Cod liver oil is an excellent source of Vitamin A, Vitamin D, essential fatty acids EPA and DHA and Omega 3 oils. These are essential to proper function of the brain and nervous system.
check out this article from WestonAPrice.org - there are some really impressive claims about how cod liver oil helps with arthritis, heart disease, diabetes, blood pressure, etc.
I bought some originally for C since he has some speech delays and many speech therapists prescribe cod liver oil to add the brain. I just went to the health food store and picked up the common brand Nordic Naturals.
BUT. Turns out this is kind of like buying a "diamond ring" from Target LOL. The nutrients in NN arent even comparable to a real, quality, cod live oil. NN gets their oil from sardines and anchovies - vs. um, COD (go figure). The brands Ill list below get theirs from deep-sea Noregian cod. NN uses Vitamin E derived from SOY (I was really not happy to find this out) wherease a quality brand will use natural preservative like rosemary oil (also an antioxidant).
So. I am going to buy some more soon and really the good stuff is not that much more expensive. Generally adults take 1/2 tsp (its good for us too!) and children take 1/4 tsp so its lasts for quite awile.
Dr. Ron's Blue Ice Cod Liver Oil
(in cinammon, orange and mint)
$23.95 for 8 oz
Quantam Cod Liver Oil $15 for 8 oz
Weston Price recommended taking your Cod Liver Oil with a butter oil blend form pastured cows. Dr. Ron's site offers that choice as well. For a family of 4 it will last 45 days so thats $1 a day.
Ill write more later specifically on Vit D but from what Ive been reading, it is VERY important and MOST of us are not getting enough.