Betaine is widely used in the personal care and cosmetics industry as a moisturizing agent. It helps to hydrate the skin and hair by retaining moisture, making it a common ingredient in shampoos, conditioners, and skincare products.

In the food industry, it serves as a dietary supplement to support liver function, improve muscle endurance, and aid digestion. It is also added to certain foods, such as meat and bakery products, as a humectant, stabilizer, or to enhance flavor and texture.

In agriculture, betaine is used as an additive in animal feed to improve growth performance and reduce stress in livestock, particularly in poultry and swine. It is also applied as a biostimulant in crop production to enhance plant tolerance to environmental stresses like drought and salinity.

Additionally, betaine finds application in biochemistry and molecular biology as a stabilizing agent for proteins and enzymes during laboratory experiments. Its versatility makes it valuable across various industries.