I think natural form of vitamin C intake is more beneficial than synthetic form because natural vitamin C is fresh and more reliable than synthetic one. It dont have any side effects too. However when you are sick, eat as many oranges (and other vitamin-C rich fruits) as you can, While you also take tens of thousands of milligrams of cheap, supplemental ascorbic acid vitamin C. There are many vitamin C benefits to our health and life.
The main dietary sources of vitamin C are fresh fruits and green leafy vegetables. Traces of vitamin C occur in fresh meat and fish but scarcely any in cereals, Germinating pulses contain good amounts. Roots and tubers contain small amounts. Amla or the Indian gooseberry is one of the richest sources of vitamin C both in the fresh as well as in the dry condition. Guavas are another cheap but rich sources of this vitamin.