AcidSialic Acid is a naturally occurring carbohydrate. AcidSialic Acid was originally isolated from the mucin of the submandibular gland, hence the name. AcidSialic Acid is usually present in the form of oligosaccharides, glycolipids or glycoproteins. AcidSialic Acidthe brain has the highest levels of sialic acid in the human body. AcidSialic Acid content in the gray matter is 15 times that of the liver, lungs and other internal organs. AcidSialic Acidthe main food source of sialic acid is breast milk, also found in milk, eggs and cheese.