Are iron oxides vegan?

Iron oxides, also identified by the food additive code E172, are mineral-based chemical compounds composed of iron and oxygen used primarily as colorants to provide red, yellow, and black pigments. While they occur naturally in mineral ores such as hematite, commercial food-grade iron oxides are synthesized industrially to ensure chemical purity and remove heavy metal contamination. Manufacturers produce them through controlled chemical reactions, typically by the precipitation of iron salts followed by washing, drying, and calcination. These pigments commonly appear in confections, cake decorations, candy coatings, dietary supplement tablets, and pharmaceutical capsules.

Iron oxides are considered vegan because they are derived entirely from mineral and synthetic sources. Animal-derived ingredients, tissues, and byproducts are not used as raw materials or processing aids at any stage of their production. Because the manufacturing process relies solely on inorganic chemical compounds, iron oxides are free from animal inputs and are fully suitable for a vegan diet.