Peptides, like hyaluronic acid, improves communication between cells, encouraging them to pump out collagen and elasticin, the key ingredients that keeps skin looking youthful. There is a large number of peptides and their purported uses for anti aging, like Dipeptide-2 (in Hylexin), which supposedly improves lymphatic circulation to shrink bags under the eyes, and Palmitoyl Tripeptide 3 (in Kinerase Ultimate day and night products), which is thought to form a supportive structure for the skin, like collagen. Some studies on Kinerase found that Palmitoyl Tripeptide 3 can increase collagen syntheses stimulation by 119 percent. That not only firms the skin, but also smoothes areas that have lost tissue, like stretch marks.
Other than the above mentioned Hylexin and Kinerase Ultimate products, other products contain peptides - Perricone MD Neoropeptide Firming Moisturizer, Olay Regenerist 14 Day Skin Intervention, and Patricia Wexler MD Dermatology Advanced Fastcription No Injection Wrinkle Filler. All of these products claim to be effective, but extensive research has been done on Kinerase and Hylexin and the results found these products deliver results.