Not all preservatives deserve to be called poisons. BHT is a preservative because it's an antioxidant. It's available as a dietary supplement for that reason. A

Not all preservatives deserve to be called poisons. BHT is a preservative because it's an antioxidant. It's available as a dietary supplement for that reason. Alpha-tocopherol is a preservative additive but is often used to fortify foods with additional vitamin E. Salt, vinegar, and ascorbic acid are all also preservatives.