Ecdoin is also called tetrahydromethylpyrimidine carboxylic acid. Ecdysone protects halophilic bacteria from damage and it has two major functions: 1) Moisturizing: It is an important substance to maintain the osmotic pressure balance and its unique molecular structure has strong water Chemicalbook complexation ability, which can structure free water in cells and is a very excellent natural moisturizer. 2) Repairing: Ecdysone can counteract UV damage to skin and repair UV-induced cell DNA damage.