Ingredient · Updated October 2026

Sodium metabisulfite

Flagged in 2

Found in 2 products

What is Sodium metabisulfite?

Sodium Metabisulfite is a chemical compound commonly used as a preservative. It is created by combining sulfur dioxide with sodium carbonate, leading to a crystalline powder that dissolves in water.

As a preservative, it's effective in preventing the growth of bacteria and fungi in both foods and industrial products. However, it can pose health concerns for sensitive individuals, particularly those with asthma or sulfite sensitivities, as it may trigger allergic reactions or respiratory issues.

When you see Sodium Metabisulfite on a label, it's important to consider the context, especially if you have a known sensitivity to sulfites. It's allowed in many food and cosmetic products but with usage limits imposed by regulatory bodies.

Commonly found in: foods, makeup, food preparation, cleaning products, bottled water

What to watch

May cause allergic reactions in people with sulfite sensitivity.
Can trigger asthma symptoms in sensitive individuals.

FDA

The FDA regulates its use in food and requires it to be declared on labels due to possible allergic reactions.

Research

Studies show it is effective as a preservative, but there are concerns over asthma and allergy aggravation in sensitive groups.

Vegan

Sodium Metabisulfite is not derived from animals and is typically considered vegan-friendly.

Sources: Food Additive Regulations for Sulfites

Scout's take

Sodium metabisulfite is a preservative used to prevent oxidation and spoilage. It can cause allergic reactions in sensitive individuals, particularly those with asthma. Its use is primarily functional, with no nutritional benefits.