Saccharin

What Is Saccharin?

Saccharin is the oldest artificial sweetener in commercial use, discovered accidentally in 1879 at Johns Hopkins University. It is a sulfonamide compound — benzoic sulfimide — that is approximately 300–500 times sweeter than sucrose and provides no calories, as it is not metabolized by the body and is excreted unchanged in the urine.

Saccharin is sold under brand names such as Sweet'N Low in the United States and Hermesetas in Europe. It has a distinctive bitter or metallic aftertaste at higher concentrations, which has historically limited its use as a standalone sweetener and led to its frequent blending with other sweeteners in commercial formulations.

Safety History and Regulatory Status

Saccharin has a complex regulatory history. In 1977, the FDA proposed a ban after studies showed that very high doses caused bladder tumors in male rats. The U.S. Congress responded by requiring warning labels on products containing saccharin rather than an outright ban. Subsequent research revealed that the underlying mechanism was species-specific and not relevant to human physiology — related to the high pH and specific protein composition of rat urine — and does not occur in humans or other primates.

In 2000, the U.S. National Toxicology Program removed saccharin from its list of anticipated carcinogens, and warning labels were no longer required. The FDA reaffirmed saccharin's safety, and it currently holds GRAS status. JECFA and EFSA have both established an ADI of 5 mg per kg of body weight per day. Saccharin is approved in over 100 countries.

Individuals with sulfonamide allergies should exercise caution, as there is a theoretical possibility of cross-reactivity, though documented allergic reactions to saccharin are rare.

Practical Uses

Saccharin is heat-stable and has an extremely long shelf life, which gives it advantages in certain food and pharmaceutical applications. Common uses include:

• Tabletop sweetener packets (e.g., Sweet'N Low)
• Diet soft drinks (often blended with other sweeteners to mask aftertaste)
• Toothpaste and mouthwash
• Vitamins and pharmaceutical preparations
• Diabetic-specific food products
• Canned goods and jams

Because of its longevity as a sweetener, saccharin remains a cost-effective option in commercial food manufacturing, though it has been largely replaced or supplemented by newer sweeteners in many consumer-facing products due to taste preferences.