Sodium Citrate: Sodium Citrate is the sodium salt of citrate with alkalinizing activity. Anhydrous: C6H5O7Na3; Hydrated: C6H5O7Na3·nH2O (n = 2 or 5) or C6H5Na3O7/ C6H5O7. 3Na or Na3C6H5O7 or C6H5Na3O7. https://pubchem.ncbi.nlm.nih.gov/compound/Sodium_citrate#section=Top

Sodium citrate is used in cosmetics and skincare products primarily to control the pH level of your product. It also helps to preserve formulations and prevent bacteria and microbial growth.