Kate Somerville Peptide K8 Power Cream 1oz/30mL Anti-Age FULL SIZE; BRAND NEW SEALED BOX. Retails for $158. Kate’s age defense moisturizer takes a multi-dimensional approach to skin repair. Its advanced clinical formula works quickly and over time to improve texture and tone while smoothing and firming skin. Clinically proven to minimize the appearance of fine lines and wrinkles, to have a visibly smoothing effect to the skin and to improve moisturization.