111Skin Y Theorem Bio Cellulose Facial Mask 5 Pack in Beauty: NA. 111Skin Y Theorem Bio Cellulose Facial Mask 5 Pack in Beauty: NA. The Y Theorem Bio Cellulose Facial Mask is a healing treatment to repair, rest and rejuvenate your skin. Designed to soothe, support and strengthen stressed skin, 111Skin's reformulated mask is infused with complexes that are inspired from wound-healing processes. The superior bio-cellulose body, initially used to treat burn victims, acts as a second skin that encourages superior penetration of ingredients. Alongside a blend of botanical and synthetic actives, the mask works to support a plumper, brighter and calmer appearance within the complexion. N-Acetyl Cysteine (NAC) is a skin conditioning ingredient that supplies bioavailable cysteine for glutathione (a tripeptide antioxidant) replenishment. NAC also prevents oxidative damage and inflammation as well as playing a vital role within repair processes of the skin, providing an optimum environment for collagen and elastin production.. Suitable for normal skinTargets concerns of fine lines and wrinkles. Biodegradable & cruelty-free. Free of Sulfates and Paraffin. 5 masks x 0.78 fl oz/ 23 ml. Apply middle Bio Cellulose layer to clean, dry skin. Wear for 20 minutes. Use up to three times per week, and for longer durations when extra hydration is needed. 111R-WU70. YTBM115. Working in collaboration with space scientists responsible for the well-being of astronauts, renowned cosmetic surgeon Dr. Yannis Alexandrides developed the patented NAC Y2 formula that runs through the core of his highly effective skincare line. Named after his Harley Street, London clinic, 111SKIN's cutting-edge products feature potent healing ingredients designed to promote a youthful and radiant appearance while offering unprecedented protection against environmental damage.