Vitamin: nf A vitamin is an organic substance, contained in food and essential for the proper use of their nutritive principles (lipids, proteins and carbohydrates) and for certain functions (vitamin A for vision, for example) (See below the table of roles and main dietary sources of vitamins).
The quantities of vitamins required are very low (from microgram to milligram), but they must be provided imperatively, and if possible...
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