No.2 is applied after chemical processes to repair any remaining bonds that were not relinked during the first step of the service. It can also be used by itself as a Mini Treatment to provide additional reparative benefits during other salon services. Brand new, sealed, unopened. Authentic, I am a licensed cosmetologist. Each bottle purchased has a unique QR code. Scan the unique QR code on the bottle to verify authenticity. 3-5 buisness days shipping & handling