https://en.wikipedia.org/wiki/Sodium_metabisulfite
Na2S2O5
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Sodium metabisulfite is added as an excipient to medications which contain adrenaline (epinephrine), in order to prevent the oxidation of adrenaline.[7] For example, it is added to combination drug
formulations which contain a local anaesthetic and adrenaline,[7] and to the formulation in epinephrine autoinjectors, such as the EpiPen.[8] This lengthens the shelf life of the formulation,[7] although the sodium metabisulfite reacts with adrenaline, causing it to degrade and form epinephrine sulfonate.[9]
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It (or liquid SO2) is commonly used as an antimicrobial and
antioxidant in winemaking; bottled wine indicates its use with the label “Contains Sulfites” in the US.
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Safety
Sodium metabisulfite, despite not being flammable, decomposes at 150°C releasing toxic sulfur dioxide. It is corrosive when dissolved in water. Some people who are sulfite sensitive may experience an allergic reaction to sodium metabisulfite, sometimes severe, resulting in labeling requirements for food safety.[22] In 2024, it was named ‘allergen of the year 2024’ by the American Contact Dermatitis Society.[23]
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Also, in hair care:
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Sodium Metabisulfite: A preservative and antioxidant that prevents the dye ingredients from oxidizing and changing color in the bottle before it is mixed with a developer.
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