Raisins are made from fresh grapes, dried or air-dried, and dehydrated in large quantities. There will be a lot of water loss during the formation of dried fruits, and some water-soluble vitamins will evaporate with water during this process. Some active substances such as flavonoids will also be lost to some extent. Moreover, some active substances of grapes will inevitably be destroyed in the sun-curing process. Therefore, raisins are not as rich in nutrients as fresh grapes.
In the process of changing from fresh grapes to raisins, the proportion and content of rich nutrients in grapes will change to some extent. Water loss, sugar increase, iron content will further increase. So it can provide more energy to the human body. If it is anemia, raisins will be many times more effective than fresh grapes when needed.
In a word, raisins and fresh grapes have their own advantages, but they are both rich in minerals. Only a lot of fresh grapes can make a little raisin. If you want to get the same amount of minerals, the demand for fresh grapes is many times that of raisins, so raisins can completely win by quantity in the demand for mineral supplements. Therefore, if you eat the same amount of fresh grapes and raisins, their nutritional value is almost the same. If you want to supplement more comprehensive nutrition, you should eat fresh grapes, but if you need energy, you should choose raisins. If it is simply to obtain minerals, it is recommended to eat raisins, and the same amount will get more minerals.