Organic grapes do not have added sulfites. Organic grapes may contain some naturally occurring sulfites. Organic grapes cannot have added sulfites that were not naturally present on the grape when it was picked.
The use of sulfites in organic farming is allowed under specific circumstances. Sulfites are used as an antioxidant and microbial inhibitor to help preserve food. Organic farmers must use the lowest possible amount needed and document why they use it to comply with organic regulations.
While the amount of sulfites in organic grapes is typically much lower than in conventionally grown grapes, there is no way to guarantee that all organic grapes are 100% free of sulfites.
Conventionally grown vineyards spray their grapevines with sulfur as pest control. However, it must be applied at least 30 days before harvest to reduce the residual effects. Sulfur residue may remain on the grapes, but it is not likely enough to cause any significant health issues. But if they miss following the 30 days intervals, it causes allergies and may cause significant health issues. Additionally, some winemakers may add or “spike” a small number of sulfites as a preservative, though this practice is not allowed in certified organic wine.
In conclusion, organic food doesn't just mean no chemicals or pesticides – it also means knowing where your food came from and how it was processed. Knowing what ingredients can be found in grapes can help you make better decisions regarding eating healthy and supporting responsible farmers.