If you really want to know what’s in your wine, other than grapes and yeast, take a moment to consider that traditionally farmed grapes contain trace levels of pesticides, even after washing, due to absorption through soft skins. In addition, small amount of pesticides have been found in wines made with traditionally farmed grapes.
But before you give up drinking wine entirely, consider trying organic and biodynamic wines, whose farming practices are both rooted in a philosophy that involves promoting the use of natural techniques to keep the soil and crops healthy without the use of synthetic pesticides or fertilizers.