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Any dietary factor or other substance that possesses the activity of a given vitamin or acts to counteract a vitamin deficiency; such as, carotenoid in human subjects.

The primary known role of carotenoids is to act as a source of vitamin A in the diet and fruits and vegetables are the main sources of carotenoids in the human diet.

This entry is located in the following unit: vita-, vito-, vit- + (page 4)