The phrase "contains sulfites" on wine labels sounds like a warning, but sulfites are naturally occurring compounds that are actually essential for preserving wine quality.
Sulfites, while viewed with skepticism, are necessary additions for extending wine's shelf life, discouraging bacterial growth, and preventing oxidation—enabling wine to age gracefully.
No wine can be entirely sulfite-free since all wines, via yeast fermentation, produce some sulfites; those labeled sulfite-free contain less than 10 ppm.
The common belief that sulfites cause wine headaches is largely exaggerated; more likely culprits include histamines, tannins, sugars, gelatins, or even the alcohol itself.
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