6 '- SL is composed of galactose, glucose, and sialic acid, and is the most abundant sialylated HMO in breast milk. Salivary acid is an important component of neurons, and 6 '- SL can directly or indirectly affect the occurrence of neural signal transduction in the brain. It can serve as a neurotrophic factor to provide energy and material basis for the brain, regulate neuronal morphology and function, and may help improve the intellectual development and cognitive ability of infants and young children.

6 '- SL is approved for use in various foods and beverages such as infant formula, beverages, dairy products, etc. in the United States. The scope of application and maximum dosage may differ slightly between the United States and the European Union. The EU can also apply 6-SL to dietary supplements, formula foods for special medical purposes, and milk based beverages or similar products intended solely for young children.