The science
The formula's distinctive claim is anti-glycation, and unlike most cosmetic novelties it has human tissue data behind it. Glycation is the non-enzymatic reaction between reducing sugars and the amino groups of long-lived proteins, and in skin its targets are dermal collagen and elastin; the resulting advanced glycation end-products, of which carboxymethyl-lysine and pentosidine are the standard markers, cross-link collagen fibres, stiffen them, resist normal turnover and give aged dermis its yellow-brown, inelastic character. Carnosine, the beta-alanyl-histidine dipeptide, is a carbonyl scavenger that competes with protein amino groups for the reactive intermediates of that reaction. A 2018 study in Skin Pharmacology and Physiology tested it in human skin explants maintained under glycating conditions and reported reductions in carboxymethyl-lysine of around sixty percent in epidermis and forty percent in reticular dermis, with pentosidine reduced by roughly half; a finished facial cream containing carnosine reproduced the effect in the same model. The important qualifications are that this is ex-vivo, not a clinical trial, and that scavenging prevents new cross-links rather than reversing existing ones, so the benefit accrues as slower aging over years rather than as a visible change at any follow-up visit.
The visible effects in this cream come from ingredients ISDIN does not headline. Niacinamide, placed fifth above glycerin, has multiple controlled facial trials at two to five percent showing improvements in fine lines, elasticity, barrier function and sallowness over eight to twelve weeks, and it is the most likely source of any firmness change users notice. Sodium hyaluronate crosspolymer is hyaluronic acid cross-linked into a network that resists diffusing away from the surface, which extends the humectant effect and underlies the twelve-hour hydration claim; with glycerin and betaine it accounts for the immediate plumping. The two peptides, palmitoyl tripeptide-38 and a lysyl-derived tetradecyl urea peptide, are signalling peptides supported mainly by supplier in-vitro studies of collagen and hyaluronic-acid synthesis in fibroblasts, with small brand-sponsored clinical panels; their placement at the end of the list is consistent with the low fractions of a percent at which they are supplied, and their contribution should be read as plausible and modest. The Alteromonas ferment is a marine exopolysaccharide with supplier data on reducing particulate adhesion and oxidative markers in cultured skin models, which is where the anti-pollution language comes from; in the finished product it behaves as a light film-former. Tocopherol and ascorbyl palmitate provide antioxidant support, and denatured alcohol at the end of the list serves the texture rather than the skin.
References 1 ShowHide
- Novel Facial Cream Containing Carnosine Inhibits Formation of Advanced Glycation End-Products in Human Skin — Skin Pharmacology and Physiology (2018)