It is principally a mixture of the glycerides (see glycerol) of many fatty acids, But its minor constituents, the fat-soluble vitamin a and vitamin d, give it its importance.

主要是由多种脂肪酸甘油脂组成的混合物，含有少量但很重要的脂溶性维生素a和d。

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But some vitamins, especially fat-soluble ones that are stored in the liver, can be harmful if taken in excess. Taking too much vitamin a can lead to headaches, skin changes and liver damage.

但是一些维生素，特别是脂溶性维生素在肝脏中储存，补过了就会影响健康。

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Also known as tocopherol or produced in the pregnant phenol, is a fat-soluble vitamin, is one of the most important antioxidant.

又名生育酚或产妊酚，是一种脂溶性维生素，是最主要的抗氧化剂之一。

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Vitamin D is a fat-soluble vitamin that occurs naturally in a limited number of foods, so fortified foods including milk, margarines and breakfast cereals and dietary supplements are the major source for most Americans.

CNN: How much vitamin D should someone over 55 take?

Beta carotene is a type of carotenoid, a plant pigment that is a provitamin for vitamin A. During its digestion and metabolism, a percentage is converted to vitamin A, a fat-soluble vitamin that is important for vision, growth and development, and healthy immune and reproductive function.

CNN: Should I take beta carotene as a supplement?