10/29/2025 / By Laura Harris

Preservatives are used to extend shelf life, maintain color and prevent spoilage. But not all preservatives are created equal. Some come with serious health risks. One such chemical is sodium metabisulfite, a controversial additive that has been linked to allergic reactions, respiratory issues and long-term toxicity. Despite regulatory restrictions, it remains in many processed foods today.
Sodium metabisulfite is a sulfur-based preservative widely used in the food, beverage and pharmaceutical industries. It functions primarily as an antioxidant and antimicrobial agent, helping to prevent bacterial growth and oxidation that can lead to spoilage. The use of sodium metabisulfite dates back to the early 20th century, when it became popular for preserving dried fruits, wines and processed meats.
However, in the 1960s and 1970s, growing concerns about its potential allergic and toxic effects prompted regulatory scrutiny. This culminated in stricter regulations introduced by the U.S. Food and Drug Administration (FDA) in 1986. Despite the health concerns, sodium metabisulfite is still permitted for use by both the United States and the European Union, although its use is restricted and subject to specific limits. The compound is not naturally occurring; it is synthetically produced by reacting sodium bisulfite with sulfur dioxide, making it a purely chemical additive.
Research and regulatory actions suggest significant risks linked to sodium metabisulfite in food:
Sodium metabisulfite is a synthetic, non-nutritive preservative with documented health risks, including allergies, asthma and potential long-term toxicity. While regulators have imposed some restrictions, it still lurks in many processed foods.
This story is not medical advice and is not intended to treat or cure any disease. Always consult with a qualified naturopathic physician for personalized advice about your specific health situation or concern.
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