Olay
Olay was founded in 1952 and is owned by Procter & Gamble. The Regenerist line is Olay's most clinically studied anti-aging range, and this serum contains the brand's highest concentration of Palmitoyl Pentapeptide-4 (Matrixyl) — a collagen-stimulating peptide with independent clinical trial support published in the International Journal of Cosmetic Science.