SULFITES — Friend or Foe of Wine? Below is an excellent link to answer these questions.
In summary, there are four major myths regarding Sulfites:
1. Sulfites in wine causes headaches – FALSE
2. Red wines contain the highest levels of sulfites –FALSE. White wines have almost twice as much and canned soup has six times as much sulfites!
3. Sulfites do not occur naturally – FALSE. Your body produces 10-20 times the amount found in Red Wine daily! Also, sulfites occur naturally in the fermentation process.
4. Sulfites affect the flavor of wine – FALSE. Generally they are so low, they help preserve not take away from the flavor.
Read the following article for more info: http://learn.winecoolerdirect.com/wine-sulfites/ and other one: http://winefolly.com/tutorial/sulfites-in-wine/
If you still doubt, perhaps try a sulfite filter to get wine to a natural state: http://ullowine.com/