Son of Food

It sounds like an urban legend, but there’s a kernel of truth behind the idea that human hair has been used in food production. The connection comes from an amino acid called L-cysteine, which has historically been sourced from hair, feathers, or other keratin-rich materials.

Today, most L-cysteine is produced synthetically or from safer sources, but its unusual origins still surprise people. Understanding where it shows up can help you make more informed choices about what you eat.

Commercial Bread Products

Many packaged breads use L-cysteine as a dough conditioner to improve texture and shelf life. It helps make dough more pliable and easier to process on a large scale.

While modern production often relies on synthetic versions, older methods sometimes sourced it from human hair. That history is what fuels the surprising connection.

Bagels

Bagels, especially mass-produced varieties, may also include dough conditioners like L-cysteine. This helps achieve that chewy texture people expect.

Because bagel dough is dense and requires significant processing, additives are more common. The ingredient source has evolved, but its past origins remain notable.

Pizza Dough

Pre-made pizza dough, particularly in frozen or chain restaurant settings, sometimes includes additives to standardize consistency. L-cysteine can play a role in speeding up production.

This allows manufacturers to produce dough quickly without long fermentation times. While convenient, it’s another place where the ingredient has historically appeared.

Processed Pastries

Packaged pastries such as croissants, danishes, and snack cakes often rely on conditioners to maintain softness. These products are designed for long shelf life and uniform texture.

L-cysteine has been used in some formulations to achieve those results. Today, labeling and sourcing practices are more transparent than in the past.

Crackers

Certain commercial crackers use dough enhancers to maintain a consistent crunch and structure. This is especially true for large-scale production.

Although not all brands include L-cysteine, it has appeared in ingredient lists before. Checking labels can help you understand what’s included.

Tortillas

Soft tortillas, particularly those sold in bulk, may include additives to keep them flexible and prevent tearing. Dough conditioners can help maintain that soft texture over time.

As with other baked goods, L-cysteine has been used in some cases. However, many manufacturers now opt for alternative sources or different additives entirely.

Fast Food Buns

Fast food buns are engineered for consistency, softness, and durability. They need to hold up under heat, moisture, and handling without falling apart.

To achieve this, manufacturers sometimes use dough conditioners. Historically, this included L-cysteine derived from keratin sources, though modern practices have largely shifted away from human hair sourcing.

• L-cysteine is an amino acid used to improve dough texture
• It was historically sourced from keratin, including hair and feathers
• Many manufacturers now use synthetic or plant-based alternatives
• Ingredient labels can help identify its presence
• Not all products in these categories contain it

It’s important to keep this topic in perspective. While the idea may sound alarming, food safety regulations and modern manufacturing have significantly changed how ingredients are sourced.

Most consumers today are unlikely to encounter products using older sourcing methods. Still, knowing the history behind certain additives can make you a more informed shopper.