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Official CosIng Information


A four amino acid (Glycine – Glutamic acid – Lysine – Glycine) peptide that belongs to the group of signal peptides that mimic skin-protein breakdown products to trick the skin into creating some nice new skin proteins, such as collagen (if this sentence is not clear, here is a bit longer and nicer explanation). 

According to its manufacturer, Tetrapeptide-21 shows superior collagen, hyaluronic acid and fibronectin (all nice and important skin elements) boosting activity, and can smooth and minimize all kinds of wrinkles. Their in-vivo (made on real people) tests confirmed that the peptide improves skin elasticity after 8 weeks of use, and they also have some nice before and after pictures showing visible-to-the-naked-eye wrinkle reduction around the eye area. 

Products with Tetrapeptide-21

Perricone MD No:Rinse Intensive Pore Minimizing Toner NeoCutis Micro Gel Cyberderm H2O Hydration Dr Dennis Gross Triple C Firming Peptide Oil Peter Thomas Roth Un-Wrinkle Turbo Line Smoothing Toning Lotion Beauty Counter Countertime Tetrapeptide Supreme Cream Dr Dennis Gross Firming Peptide Milk Dr Dennis Gross Hydra-Pure Oil-Free Moisturiser Isomers All-In-One The Cream ACO Face Anti Age 40+ Lift & Fill Hydrating Serum ACO Face Anti Age 40+ Lift & Fill Night Cream Normal Skin Algenist Concentrated Reconstruting Serum Cliniderm Age Correct Day Cream Medik8 Liquid Peptides ACO Face Anti Age 40+ Lift & Fill Firming Eye Cream Algenist Power Advanced Wrinkle Fighter Serum Cliniderm by ACO Cliniderm Age Correct Night Cream Melina Organics Intimate Whitening Gel NeoCutis Micro Serum Zo skin health Hydrating Creme ACO Face Anti Age 40+ Lift & Fill Day Cream Normal Skin Spf15 ACO Anti-Age Filling Night Cream Dry Skin Dr Dennis Gross Ferulic + Retinol Triple Correction Eye Serum Serious Skincare Pure-Pep Peptide Concentrate Meaningful Beauty Skin Brightening Decollete And Neck Treatment Broad Spectrum Spf 15 NCN PRO SKINCARE All-In-One Anti Aging Cream Cliniderm Age Defence Sun Face Cream Spf50 Perricone MD Neuropeptide Night Cream StriVectin Tl Advanced Tightening Neck Cream Plus Algenist Complete Eye Renewal Balm Dirty Works (Sainsbury's) Collagen On Call Overnight Facial Lift Dr Dennis Gross Ferulic + Retinol Serum Triple Correction Eye Serum Dr Dennis Gross Hyaluronic Marine Hydration Booster Dr Dennis Gross Ferulic + Retinol Triple Correction Eye Serum REPLENIX Restorative Nighttime Bio-Therapy Serious Skincare Pure Pep Creme Riche StriVectin Tightening Face Serum No7 Lash Impact Lash Serum StriVectin Peptight Tightening & Brightening Face Serum Dr Dennis Gross Ferulic + Retinol Eye Cream REPLENIX Enriched Nighttime Bio-Therapy Jack Black Dry Erase Ultra-Calming Face Cream Philosophy Anti-Wrinkle Miracle Worker Moisturizer Dr. Loretta Anti- Aging Repair Moisturizer No7 Youthful Eye Serum Rodan + Fields Redefine Overnight Restorative Cream BIOLIQ Intensive Eye Serum Cover fx Natural Finish Foundation StriVectin Intensive Eye Concentrate For Wrinkles Dr Dennis Gross Ferulic And Retinol Anti-Aging Moisturiser