Kerastase Genesis Defense Thermique Blow Dry Primer

What the experts use it for.

The concerns the experts tie this product to, in their own words. Paid and founder takes don't count.

Damaged or breaking hair1 expert

“This is a leave-in conditioner, lightweight, but at the same time helps to reduce breakage and offers heat and UV protection.”

Dr. Jenny Liu, watch at 28:29

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

All takes Yay takes Nay takes Mixed takes Hide sponsored

Tea with MD

115k subs

✓Yay

"It has edetoise native cells which are really rich in antioxidants, [...] and it also has this Aqua Oolium complex which helps to lock in moisture while smoothing and softening your cuticle. This is an incredible product. It smells really good, too."

Dr. Jenny Liu

324k subs

✓Yay

"One that I absolutely love, one of my favorite heat protectants of all times, again from Kerastase, and it's their Genesis line, their Defense Thermique. This is a leave-in conditioner, lightweight, but at the same time helps to reduce breakage and offers heat and UV protection. Their whole Genesis line [...] is really meant for individuals that experience hair fall due to breakage. [...] I really love their shampoos and conditioners, but really this is the one that I use the most."

Abbey Yung

888k subs

✓Mixed

"But something about this spray bottle, mixed with that slightly thicker texture, just wasn't the best match. I just feel like it doesn't spray out of this spray bottle in the best way. It's not the most even. It's not something that [...] evenly disperses all over your strands the way that you want it to. It definitely wasn't terrible, it's just something I noticed was bothering me, especially compared to all of my other leave-in conditioners, which I don't feel do that."

What the evidence says.

Independent of what the gurus think, this is what the published research supports about the main active ingredients here.

Frequently asked.

What is Kerastase Genesis Defense Thermique Blow Dry Primer?

A heat-protection primer spray designed to prepare hair before blow-drying, infused with antioxidants and a moisture-locking complex.

Is Kerastase Genesis Defense Thermique Blow Dry Primer worth it?

Mostly yes. 2 of the 3 gurus who reviewed it give it their stamp of approval, for a Guru Score of 80%.

What is Kerastase Genesis Defense Thermique Blow Dry Primer's Guru Score?

Kerastase Genesis Defense Thermique Blow Dry Primer holds a Guru Score of 80%. That is our read on how warmly the experts talk about it, based on the verdicts of 3 expert reviewers we have collected.