Our expert says:
Lindsey, it’s more often not the foods themselves that contain the sulphur, but rather the preservatives and additives in them. The best person to ask about these things would be DietDoc.
Your allergy can be related to porphyria or it can even be a sign of porphyria. The best would be to see your doctor and have him do the tests for you to make sure. Good luck.
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