0 any of a group of natural substances that are necessary in small amounts for the growth and good health of the body:
1 any of a group of natural substances that are necessary in small amounts for growth and good health and that are obtained from food
A diet deficient in vitamin D may cause the disease rickets.
Studies suggest that regular intake of the vitamin significantly improves brain function.
Oranges are a good source of vitamin C.
Its seed is a rich source of protein, minerals, and vitamins for human nutrition, and the straw is a valued animal feed.
Some people consider trace elements or micro-nutrients to be more important in the nutrition of man than their organic micro-nutrient counterparts-the vitamins.
The leaves could also be an important source of minerals and vitamins.
