Buy the Olaplex N°.9 Bond Protector™ Hair Serum.

One bottle protects your whole head from heat and lasts way longer, instead of babysitting just the tips.

What was compared

1. Shields hair every time you reach for heat tools
Olaplex N9 is rated to protect up to 450F/232C across your whole head. Rene Furterer makes no heat protection claim at all, so your straightener or blow dryer still cooks your lengths unless you layer on another product.
2. Works on all your hair, not just the ends
N9 is built for damp or wet strands, all hair types and textures, used all over. Furterer's serum is formulated specifically for split ends, so it is doing a job on maybe an inch of hair while the rest of your head gets nothing from it.
3. Costs less per ounce and the bottle lasts longer
N9 runs 10.67 dollars per fluid ounce at 90mL, Furterer runs 38 dollars per fluid ounce in a much smaller size. For a product you are meant to use daily, that gap adds up fast over a year of refills.
4. Light enough for daily wear, no greasy buildup
Reviewers describe N9 as a weightless, silicone-free serum with pollution protection, dries hair fast and leaves it smooth without feeling heavy. That matters because a serum you use every day has to disappear into your routine, not sit on top of it.
5. Yes, Furterer has the stronger split-end stats. Doesn't matter here.
Furterer cites 82 percent felt ends stronger and 92 percent felt detangled after one use, real numbers for a real problem. But that is a fix for already-split ends, which a trim solves better anyway, while most people reach for a serum daily to stop damage and frizz before it starts, which is exactly what N9 is built for.