Sr-Dog Polypeptide-4

Sr-Dog Polypeptide-4 is a peptide—a chain of amino acids—derived from dog sources and used in skincare formulations. Peptides function as signalling molecules in skin, potentially communicating with cells to support various protective and conditioning functions.This particular ingredient is classified as an antioxidant and skin protectant, meaning it may help defend against environmental stressors and support the skin's natural barrier. It is also used for its hair conditioning properties in products designed for scalp and hair health.

As a peptide, Sr-Dog Polypeptide-4 can interact with skin cells through receptor-mediated pathways. Peptides are small enough to penetrate the outer skin layers and may trigger cellular responses that support natural skin defences and maintain structural integrity.In its antioxidant capacity, the ingredient likely neutralises free radicals—unstable molecules generated by sun exposure, pollution and oxidative stress—that can contribute to skin damage and premature ageing.

Sr-Dog Polypeptide-4 is typically incorporated into serums, moisturisers and conditioning treatments. There is no established upper limit for daily use; however, as with any active ingredient, introduce it gradually if your skin is sensitive and observe how your skin responds over 2-4 weeks before drawing conclusions about its effectiveness.

Sr-Dog Polypeptide-4 is generally considered well-tolerated in cosmetic formulations. Those with sensitivity to animal-derived ingredients should check product labelling, though peptides are typically processed and purified during manufacture.