**VITAMIN C: Benefits, Side Effects, Uses, Dosage, Warnings?** Vitamin C , also called ascorbic acid is known, is perhaps the most well-known vitamin, but this does not only support the immune system. It is a water soluble vitamin, which occurs mainly in fruits and vegetables. Cereals, meat ... to ozone increase and other hazardous breathing air components. Also prevents vitamin C to 100 percent, the conversion of nitrate and nitrite in the carcinogenic nitrosamines.