How we scored it
C12H20O10 324.3 Da: ascorbyl core (glucose-derived vitamin C) and two glyceryl ether groups (glycerin, as in Ethylhexylglycerin) are all natural. 324.3 / 324.3 = 1.00.
What counts. ISO 16128-2 scores the atoms that remain in the final ingredient. Reagents, solvents, catalysts and protecting groups used during manufacture leave no mass behind and are not counted.
Where it comes from
Ascorbic acid is etherified with glycerol-derived units, most plausibly via glycidol or 3-chloro-1,2-propanediol made from epichlorohydrin, where propylene-based supply still dominates. Glycerol-based epichlorohydrin or glycerol carbonate would give a fully natural product, so the supplier must confirm.
In plain English
A water-soluble, stabilised form of vitamin C in which two glycerol-derived units are attached to ascorbic acid; used as an antioxidant and humectant. The ascorbic acid is made by fermenting glucose; the glycerol units come from glycerin or petrochemical epichlorohydrin, depending on the maker.
CosIng definition: bis-glyceryl ascorbate
Structure
(2R)-2-[(1S)-1,2-dihydroxyethyl]-3,4-bis(2,3-dihydroxypropoxy)-2H-furan-5-one
References
- 1ISO 16128-1:2016 and ISO 16128-2:2017 — Guidelines on technical definitions and criteria for natural and organic cosmetic ingredients and products. ISO, Geneva.
- 2Bis-Glyceryl Ascorbate. PubChem CID 67266658. National Center for Biotechnology Information. pubchem.ncbi.nlm.nih.gov ↗
- 3BIS-GLYCERYL ASCORBATE. CosIng — European Commission cosmetic ingredient database. ec.europa.eu/cosing ↗
- 4BIS-GLYCERYL ASCORBATE. CosIng u2014 European Commission database for information on cosmetic substances and ingredients. https://ec.europa.eu/growth/tools-databases/cosing/search?search=BIS-GLYCERYL%20ASCORBATE