'You may be used to looking for key probiotics in yoghurt, but now the beneficial bacteria that's become popular for gut-health is showing up in skin-care products. While research is still underway, Macrene Alexiades Armenakas says "emerging data indicates that these protective bacteria may be beneficial for common skin problems such as redness, flaking, and inflamation." Find it in NUDE Skincare Advanced Cellular Renewal Serum.'