The amount of fat in a fish oil supplement is only about 1 gram. While that might help a little, studies which have shown increased absorption of fat-soluble vitamins have involved taking them with a high-fat meal (i.e., about 15 grams or more -- that's at least 3 teaspoons of oil or other fats). Most meals provide at least 5 grams of fat (the amount of fat in a single egg, for instance), while a tuna wrap with mayo can have 40 grams.
In the case of vitamin D, taking it with a meal has increased absorption by 32% to 57% compared to taking it with just water. The bigger (and fattier) the meal, the better — at least for absorption!
Of course, you can also purchase special formulations of some fat-soluble vitamins and other supplements which enhance their absorption — in some cases, even more than taking them with fats. These are described in our reviews of CoQ10
and vitamin D
. Other supplement ingredients which are fat soluble and are best absorbed with fats are vitamin A
, vitamin E
, and vitamin K
, as well as astaxanthin
and boswellia (and its key component AKBA)