Hi
Indeed Cod liver oil is a good source of vit A and vit D.
Vitamin D is an acid. Coincidentally? Calcium and Magnesium are alkaline.
Simplistically, CalMag + vit D = Acid/Alkaline Balance = pH Balance.
From http://www.westonaprice.org/archive/felter-lloyd.html
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Dose
The light-colored oil is the best. Some prefer the darker colored oils. The dose of cod-liver oil is 1/2 fluid ounce, twice a day, or more; but it is best to begin with small doses at first, say 1 drachm only, in order to lessen the risk of nausea and vomiting. Patients soon accustom themselves to its use without repugnance. It is best given alone, followed by some claret, or a little sugar and cinnamon powder, or prepared with aromatic oils, the same as castor oil (which see). It may be given in coffee, milk, or brandy, and for consumptives in Bourbon. A pinch of salt sometimes renders it palatable, while others advise the chewing of a small portion of smoked herring. Tomato catsup and particularly the froth of malted beverages appear to mask the unpleasantness of the oil. (For various methods of rendering the oil palatable, see Emulsio Olei Morrhuae.)
Dr. Alexander Wallace recommends a mixture of equal parts of lime-water and cod-liver oil, well shaken together, as a tonic, sedative, antacid, and nutrient; it forms a thick, milky emulsion, palatable, especially when taken with a little sherry wine, and may be used in all the forms of disease in which cod-liver oil is recommended.
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From the above, lime-water is a source of calcium. Therefore here is an example of taking both calcium and vit D together. To know more about lime-water and its possible use go to the Ask Moreless forum. Don't be shy to address this forum with your questions.
Another good article about cod liver oil http://www.newmediaexplorer.org/chris/2004/01/13/cod_liver_oil_number_one_sup...
Vit D3 vs Cod liver oil from AskMoreless http://curezone.com/forums/fm.asp?i=1334221#i
And remember this: vitamin D will be very useful when comes the flu season.
Dr Mercola on vit D and flu http://articles.mercola.com/sites/articles/archive/2008/10/21/avoid-flu-shots...
Video
Dr Mercola on Vit D
http://www.youtube.com/watch?v=ur_yXEUOOx8&feature=related
Dr. John Cannell on vitamin D
http://www.youtube.com/watch?v=--NqqB2nhBE
Good Luck
WIEL