Subway has announced that it will no longer use a chemical in its bread.

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"We are already in the process of removing Azodiacarbonamide as part of our bread improvement efforts despite the fact that it is USDA and FDA approved ingredient," the company said in a statement. "The complete conversion to have this product out of the bread will be done soon."

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The chemical, which could be used to increase elasticity in dough, is banned in some other countries.

A food blogger has pointed out that this chemical is used in shoe rubber and yoga mats, and claims that it has been linked to allergies and asthma. She started an online petition calling on Subway to stop using the chemical.