For more than two millenia, byssus - the protein fibres produced by certain molluscs to anchor themselves underwater - occupied an extraordinary place in Mediterranean material culture. The byssus of the noble pen shell, Pinna nobilis, was processed into “sea silk”, a rare textile prized for its remarkable natural qualities. With its traditional source now increasingly scarce, this once-celebrated material has all but disappeared.
Today, a different source of byssus is produced at scale by the modern mussel-farming industry. The blue mussel, Mytilus edulis, produces byssus, which stays attached to the mussel when harvested and is mechanically removed during processing, leaving behind an overlooked marine by-product.
Scottish biomaterials company Seastex saw something different.
Through years of developing proprietary byssus processing technology, Seastex has transformed this overlooked resource into Byssup™: a fine, golden marine powder created for cosmetic innovation. Responsibly sourced from the aquaculture industry and processed without chemical modification or hydrolysis, Byssup™ contains approximately 95% structural proteins while preserving its naturally occurring amino acids.
Now recognised under the INCI name Mussel Byssus Powder, Byssup™ gives cosmetic R&D teams access to an unusual new 100% natural ingredient with a story spanning ancient material culture, modern biotechnology and circular innovation.
Beyond its provenance lies an equally interesting formulation opportunity. Byssup™ offers researchers a naturally derived, protein-rich particulate to explore for skin-conditioning, textural and sensory applications, or as an active-support ingredient. Its distinctive golden appearance also creates opportunities where the ingredient itself can become part of a formulation’s identity and storytelling.
Its potential extends across facial and body care, prestige treatments and marine-inspired collections - particularly for brands seeking ingredients that combine scientific novelty, traceable origin and genuine differentiation.
Byssup™ is now commercially available to cosmetic R&D and formulation teams for evaluation and development.
