Respect Your Hill
Join Date: Feb 2005
Bikes: 2007 Colnago CLX Carbon, 2 Cannondale R2000Si's (road), 1 Trek (road), 1 Cannondale (Mtn)
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Most are best taken with a meal. Vitamins A,D,E & K are fat-soluble and are absorbed best when there is some sort of fat content in your stomach (whether it be from ingesting a meal that contains a small amount of animal fat or vegetable fat).
Vitamins C and Vitamin B are water soluble. Vitamin B needs an acidic environment for absorption (but does not require to be taken with fat). If you are taking antacids or some other sort of buffer that reduces the acid content in your stomach, you won't fully absorb the B vitamins.
Calcium is thought to be best taken at night before sleep for best absorption of this bone building supplement.
I say, google "vitamins" on the internet and you should be able to learn alot about them. As always, be careful where or who you are getting your information from, but vitamin absorption should yield similar answers across the board.
It is different if you are taking just a one-a-day versus several different pills.