A supercharged addition to the range the No.O has the highest dose of patented olaplex technology in any take home product.  Intended to work as a two part process it acts as a primer to the no.3 to rebuild hair bonds strengthening and protecting your hairs integrity.  It will restore chemical treated heat ridden hair.  Working its magic on all types and textures of hair, it even works if you have never tainted your locks with colour or tongs.  The more often it is used the healthier your hair will become!