Sunlight is the primary way to get vitamin d, although taking certain nutritional supplements — like cod liver oil — can also help.

阳光是获取维生素d的主要途径，此外，摄取一些营养补充剂如鳕雨鱼肝油也会有所帮助。

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The process of hydrogenation, which turns liquid vegetable oil into the solid oils used in commercial baking, destroys the vitamin K naturally found in the oils.

氢化油是由液态植物油经加工制成的固态商业烘焙用油。 在加工过程中，植物油中天然含有的维生素K会遭到破坏。

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Keep in mind, though, that the amounts of vitamin K in healthy oils are still tiny - one tablespoon of canola oil has 20 micrograms.

但要知道，健康食用油中的维生素k含量仍然很少——一汤匙菜籽油中的含量仅为20毫克。

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Vitamin A is found in fish liver oil.

VOA: special.2009.04.21

Fish liver oil also contains vitamin D.

VOA: special.2009.04.21

Certain dietary supplements such as vitamin D and fish oil have proven benefits, but others like bitter orange and vitamin B5 lack evidence.

CNN: Half of Americans use supplements

Omega Protein, which has been around in one form or another since 1878, is trying to get more companies to add fish oil to vitamin supplements and to food, from cereals to ice cream.

FORBES: Fishmonger

According to the U.S. Department of Agriculture's nutritional database, 100 grams of grapeseed oil contains 28.8 milligrams of the antioxidant vitamin E double that of olive oil.

WSJ: An Oil's Promises, From Cooking to Cosmetics