Is sodium benzoate in soda messing with hormones?
Possibly at high doses. Animal studies show ovarian and hormone changes from chronic sodium benzoate.
What's actually in it
Sodium benzoate is the standard preservative in many sodas, fruit drinks, salad dressings, and pickles. The FDA considers it safe at the levels usually found in food. The catch: regular soda drinkers, especially kids and teens, end up with much higher daily doses than the typical user.
Sodium benzoate can also react with vitamin C in the same drink to form small amounts of benzene, a known carcinogen.
What the research says
A 2026 study in Regul Toxicol Pharmacol exposed lab animals to chronic sodium benzoate at doses matched to heavy daily soda intake. The team saw ovarian damage and shifts in reproductive hormones, including changes in the kisspeptin-RFRP-3 system that controls puberty.
The doses weren't unrealistic. They were what a daily two-soda habit could deliver in a child.
Cut soda for kids and replace with plain water, milk, or unsweetened sparkling water. Read labels: brands without sodium benzoate exist, especially in the natural-soda aisle. Skip combos of sodium benzoate plus vitamin C in the same drink.
The research at a glance
| Study | Journal | Year |
|---|---|---|
| Sodium benzoate induces reproductive toxicity via hormonal disruption, ovarian damage and altering kisspeptin/RFRP-3 expression. | Regul Toxicol Pharmacol | 2026 |
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