Vitamins(维生素) Vitamins are organic substances that, along with carbohydrates, proteins, fats, and inorganic salts,are required in the diet for normal health and growth of an organism. The early history of vitamins can be traced to observations that certain diets produced disease that could be cured by a supplement of another foodstuff, For example, the ancient Arab physicians and their successors valued the use of liver to cure night blindness, and the North America Indian knew that scurvy(坏血病) could be treated by a tea made from cedar(ts)leaves. In seventeenth century, it was standard procedure for the British Navy to provide lemon juice for its sailors to prevent scurvyVitamins(维生素) Vitamins are organic substances that,along with carbohydrates, proteins, fats,and inorganic salts,are required in the diet for normal health and growth of an organism. The early history of vitamins can be traced to observations that certain diets produced disease that could be cured by a supplement of another foodstuff. For example , the ancient Arab physicians and their successors valued the use of liver to cure night blindness, and the North America Indian knew that scurvy(坏血病） could be treated by a tea made from cedar(杉树) leaves. In seventeenth century, it was standard procedure for the British Navy to provide lemon juice for its sailors to prevent scurvy