A Peptide-Rich Serum: Kate Somerville Kx Active Concentrates Bio-Mimicking Peptides Serum If you're changing up your skin-care routine to focus on anti-ageing, incorporating Kate Somerville Kx Active Concentrates Bio-Mimicking Peptides Serum ($59, originally $98) will give you a smoother, firmer complexion. Peptides can help your complexion look lifted, firmer, and brighter as well as support the moisture barrier. You can use this twice a day. Image Source: nordstrom.com Kate Somerville Kx Active Concentrates Bio-Mimicking Peptides Serum $59 from nordstrom.com Buy Now