FAST! The Olaplex #9 serum has a monster 50 perc drop. A weightless, leave-in antioxidant serum that improves shine and texture. It even protects from future damage by nourishing hair, blocking pollutants, neutralizing free radicals, and providing heat protection up to 450°F. Sold and shipped by Amazon so your item is 100 perc guaranteed! Xo, Donna