The firming and lifting effects of this age-defying serum are enhanced with long-term use. Inactivated probiotic Lactobacillus cells are added to stimulate the skin’s production of β-defensins. These peptides shift the populations of microbes in the skin to favour beneficial species so that they can outcompete pro-ageing species. Suma Root, Muira Puama Bark, and Madonna Lily extracts are used in combination to improve the strength of capillary walls and aid in tissue repair. Over time, skin firmness and youthfulness improve.