Sr-Mussel Oligopeptide-4
A cosmetic ingredient used as antioxidant, skin protecting, skin conditioning - miscellaneous in skincare, haircare, and personal-care products sold in the European Union.
What is it?
sr-Mussel Oligopeptide-4 is a single chain recombinant protein produced by fermentation in E. coli. The starting gene is synthesized to be identical to the gene which codes for Foot Protein-5 found in the mussel, Mytilus californianus. The parent protein contains a maximum of 96 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.
What does it do?
Sr-Mussel Oligopeptide-4 is listed in the EU cosmetic ingredient inventory with the following declared functions:
-
Antioxidant
neutralises free radicals to slow oxidative damage to the formulation or skin
-
Skin protecting
helps shield skin from external environmental factors
-
Skin conditioning - miscellaneous
improves skin condition through mechanisms not classified under the more specific emollient or humectant subcategories
EU regulatory status
Sr-Mussel Oligopeptide-4 is allowed for use in cosmetic products in the European Union under Regulation 1223/2009. It is not subject to a specific Annex restriction at the time of writing.
Frequently asked questions
What is Sr-Mussel Oligopeptide-4?
Sr-Mussel Oligopeptide-4 is a cosmetic ingredient catalogued in the EU CosIng database. sr-Mussel Oligopeptide-4 is a single chain recombinant protein produced by fermentation in E. coli. The starting gene is synthesized to be identical to the gene which codes for Foot Protein-5 found in the mussel, Mytilus californianus. The parent protein contains a maximum of 96 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.
Is Sr-Mussel Oligopeptide-4 allowed in cosmetics in the EU?
Yes. Sr-Mussel Oligopeptide-4 is allowed for use in cosmetic products in the EU under Regulation 1223/2009.
What does Sr-Mussel Oligopeptide-4 do in cosmetic products?
Sr-Mussel Oligopeptide-4 is declared in the EU cosmetic ingredient inventory with these functions: antioxidant, skin protecting, skin conditioning - miscellaneous.
Related ingredients
Source: EU CosIng database (European Commission). This page is derived from public-sector information published by the European Commission. · Last updated: 25/06/2026