At first I just bought this product as a means of joining the bandwagon what with all the hype I've been hearing from magazines and blog reviews about this product. Then again, once I've tried it, all I can say is: WOW. This serum indeed did wonders to my despicably frizzy and hard to control fly-away hair! Just one to one-and-a-half pumps (or two pumps if you've got hair length that goes beyond the shoulders) of this magical serum and any mane can be tamed! I do admit, this product does not come cheap (it comes off way less costly if you buy the set though), but in the very least, it fulfills what it promises to do. I was not disappointed with the results - my hair became smoother, softer, and stayed in place. It left a hint of fragrance and left my hair more manageable but still touchable. I do not regret buying this product.

my hair is dry type and kinda frizzy, it makes my hair look unhealthy and dull. my previous serum didn't give much difference with my hair, but this one works really nice. it makes my hair less-dry and smoother, and also i love the smell too. :)

I have a really messy and frizzy long hair but dislike ironing or so, then I was recommended to use this, what a discover, never before my hair have shined that way without looking greasy or heavy and the smooth effects last for a couple days. After drying my hair with a towel usually apply two pumps with the hands and fingers thought where my ears end to the ends and that's all.
As I'm clumsy, every time dropping the bottle, even it was "closed" a little of the fluid come off all over; is a shame the original packaging is not travel-friendly.
Even I have really loved it I not repurchasing it anytime soon because is too pricey.

Wow. Its rare im impressed with anything esp for hair and i am impressed with this! I often saw it and thought its insanely over priced. I also got the Masque from the same line once and was not impressed. Ive always used my biosilk as a serum which i love, but this is def better but with a huge price jump. I got this at nordstrom rack so there it was about $36 which is insane for a serum but its def worth it for my hair type. I also rationed it thinking I wouldnt go to salon as often. My hair feels silky, I saw an immediate difference in my hair before and after flat ironing. It made my color more vibrant because of shine and took care of pesky cowlicks and tamed my ragged tips. The packaging is great because only squirt out a little. I have very long, thick thick dry and course hair so for those with fine hair this may not be for you but for those with similar hair i highly recommend.

I would love to love this product as I spent so much money on it but the truth is that I am not very impressed by it.

Pros:
- Lightweight, does not weigh hair down.
- Pleasant smell.
- A little goes a long way.
- Anti-frizz action. I live in Sweden where it is quite dry and cold between October and April/May and that actually makes my normally über frizzy hair behave but I was using this serum last spring/summer (when it was more humid) and it did an OK job controlling frizz.


Cons:
- Not very hydrating
- No heat protection. Strange as on the instructions it says you to use it before blow drying hair.
- No solar filtre or protection for external aggressions, which makes it useless for me who only uses this serum in the summer.
- Last but not least, this product is really overpriced!

I will definitely not repurchase this product. I would rather look for a serum/oil that is more versatile (i.e. solar filtre and heat protection) and gives me more for my money.
However this product might be helpful for those who live in humid weathers and have some extra cash to spend on it.

Amazing. I have used this on and off over the years, and always come back. It works wonders on my thick frizzy hair!

Having read loads of good reviews of this product I bought it myself expecting it to be a miraculous cure for my damaged hair. Unfortunatelly, i can't say it's any better than other products for hair ends. My hair is very thin and gets greasy in no time, so this product makes it even worse even though it's not very greasy itself. The only advantage i can point out is that it gives some extra shine. I just came to conclusion this product is not made for very thin hair. It may be perfect for those with thick hair.

I'm growing out my pixie -- and, although my hair is fine and straight, I've got cowlicks all over my head so manageability can be a real issue. Love that this serum tames flyaways and cowlicks without making my hair flat or greasy looking. I've always tended to be frugal with beauty products but this is absolutely worth the splurge!

A nice serum for an anti-frizz effect. I always use it after the Oleo-Relax shampoo and masque.

This is the only serum that can tame my very long and fine but tangly hair. I have tried the serum ultimate but it seems too heavy and not as detangling as this serum. I usually use Kerastase shampoo and conditioner but when I travel I just use the hotel shampoo and conditioner (bvlgari, loccitaine, etc). My hair will be smooth and shiny as long as I have this serum regardless of what I use prior. Definitely my HG and I cannot live without it!!