Comparing E223 - Sodium metabisulphite vs E227 - Calcium bisulphite

Is sodium metabisulfite bad for you?

For most people it isn’t “bad” at the low levels used in foods, but sulfite‑sensitive individuals (including some asthmatics) can have reactions such as wheezing, hives, or headaches. Regulators set a group ADI for sulfites of 0–0.7 mg SO2 equivalents per kg body weight per day.

Is sodium metabisulfite safe?

Yes—E223 is an approved preservative/antioxidant when used within regulated limits, though sulfites must be declared on labels and can trigger adverse reactions in sensitive people and some asthmatics.

Is sodium metabisulfite gluten free?

Yes. It’s a synthetic inorganic salt and contains no gluten; any gluten risk would come from other ingredients or cross-contact, not the additive itself.

What is sodium metabisulfite used for?

It’s used as an antioxidant and preservative to prevent browning and microbial spoilage in foods and drinks (e.g., wine, cider, dried fruits, seafood, potato products), and as a sanitizing agent for winemaking/brewing equipment.

How much sodium metabisulfite per gallon of wine?

To add about 50 mg/L (ppm) SO2 to 1 US gallon, use roughly 0.28 g sodium metabisulfite (about half a sodium Campden tablet); winemakers typically target 25–50 ppm free SO2 depending on pH and often use potassium metabisulfite instead.