???? Olaplex No.1 Hair Multiplier 100ml – Professional Concentrate ???? The original bond-building concentrate used by salons worldwide. ━━━━━━━━━━━━━━━━━━━━━━━━━ ✨ WHAT IS NO.1?. ━━━━━━━━━━━━━━━━━━━━━━━━━ Olaplex No.1 is the professional concentrate that started it all.