Proven to deliver visibly firmer, more supple, and healthy-looking skin after 28 days, Bio Retinoid ™ Youth Cream amplifies the power of REN's natural retinol alternative, Bidens Pilosa, by combining it with Red Algae and Olive Leaf Extracts. Red Algae Extract delivers an instant visible-lift effect that helps to smooth the appearance of fine lines; while Olive Leaf Extract helps prevent loss of firmness and protects your skin against damage caused by free radicals that can contribute to the visible signs of premature ageing. This product is vegan, dermatologist tested and approved and tested on sensitive skin.