It's called "fortified", or in the case of bread "enriched".
Yes, caffeine is naturally present in coffee.
Yes, biotin is naturally present in a variety of foods such as eggs, nuts, seeds, and certain vegetables.
find out what different nutrients ?
fats
carbohydrate
protiens
protiens
No sulfur dioxide is not present naturally. It pollutes the water.
Minerals \m/
Yes, nicotine is naturally present in tobacco leaves.
The same as in grapes