Sodium Benzoate is a salt of Benzoic Acid, found naturally in cranberries, prunes, plums, cinnamon, ripe cloves, and apples and used as a preservative in cosmetics and personal care product formulas as a fragrance ingredient, masking ingredient, anti-corrosive agent, and most frequently, as a preservative.
The Cosmetics Database still found concerns regarding cancer, developmental and reproductive toxicity, organ system toxicity, irritation and biochemical cellular changes with Sodium Benzoate as an ingredient in cosmetics and personal care products. One or more animal studies showed brain and nervous system effects at moderate doses, broad systemic effects at low doses, and in vitro tests on mammalian cells showed positive mutation results. One or more animal studies showed biochemical changes at high doses where the human health implications are not yet well understood, and animal studies showed skin irritation at high doses as well.
Some studies have shown that Sodium Benzoate itself can damage DNA by attacking the cells' mitochondria. Because mitochondria are so vital to the functions of cells and their oxygen consumption, damage can lead to malfunction and disease.
A professor at the University of Sheffield found that Sodium Benzoate and the damage that it can cause to DNA structure can be linked to a variety of neurodegenerative diseases, including Parkinson's Disease, and can damage the aging process as a whole.

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