Saccharin
The short version
The original synthetic intense sweetener — 300–500x sucrose, with a long and contested safety history.
It's permitted and generally considered safe, but there are a few reasons to be mindful — like sensitivities in some people, debated studies, or intake limits. The Safety section below explains the specifics.
Where it comes from
Discovered in 1879 by Constantin Fahlberg working in Ira Remsen's laboratory at Johns Hopkins. Produced industrially by the Maumee process from anthranilic acid or by oxidation of o-toluenesulfonamide. The oldest commercial intense sweetener — predates the 20th century.
How it's used
Used in tabletop sweeteners (Sweet'N Low), pharmaceuticals, oral care products, animal feed, and many diet beverages. About 300–500 times sweeter than sucrose with a slight metallic aftertaste. Heat-stable and suitable for cooking and baking.
Safety profile
ADI of 5 mg/kg body weight. In the 1970s, rat studies linked very high doses to bladder cancer, prompting US warning labels — these were removed in 2000 after subsequent research established the mechanism as rat-specific (rodent-specific urinary proteins). Currently considered safe by JECFA, FDA, and EFSA at normal use levels.
Physical & chemical properties
White crystalline powder, sparingly soluble in water (sodium salt is freely soluble — the typical food-grade form). Stable to heat, acid, and prolonged storage.
Regulation worldwide
Permitted globally. US warning label requirement removed in 2000. Canada banned it in food for decades but reauthorized it as a tabletop sweetener.
Educational information only. Not medical or dietary advice.