Editor's TipEditor's Tip

For best results, condition with Number 4™ Lumiere d’hiver Reconstructing Masque.

Number 4 Hair Care

Birchbox Breakdown

There was a time when we were a bit skeptical about hair oils—the last thing we wanted was a greasy, weighed down ’do. These days, however, we can't imagine a haircare routine without it. This strand-saving elixir gives drab, dull hair a coveted movie star shine (plus a whole host of reparative benefits). Our oil-free days are officially over.

How to Use

Distribute one to two pumps through damp hair, then style as usual. For added radiance, apply one pump of product to dry hair.

Cyclopentasiloxane,C13-14 Isoparaffin,Dimethicone,Dimethiconol,Phenyl Trimethicone,Perfluorononyl Dimethicone,Fragrance (Parfum),Benzyl Salicylate,Butylphenyl Methylpropional,Linalool,Hydroxyisohexyl 3- Cyclohexene Carboxaldehyde,Ethylhexyl Methoxycinnamate,Argania Spinosa Kernel Oil,Helianthus Annuus (Sunflower) Seed Oil,Glycerin,Sodium Ascorbyl Phosphate,Hydrolyzed Soy Protein,Macrocystis Pyrifera Extract,Ribes Grossularia Fruit Extract,Ribes Nigrum (Black Currant) Leaf Extract,Arctium Lappa Root Extract,Avena Sativa (Oat) Kernel Extract,Camellia Sinensis Leaf Extract,Chondrus Crispus (Carrageenan) Extract,Cymbopogon Schoenanthus Extract,Euterpe Oleracea Fruit Extract,Garcinia Mangostana Peel Extract,Hibiscus Sabdariffa Flower Extract,Hydrastis Canadensis (Golden Seal) Root Extract,Ilex Paraguariensis Leaf Extract

More for You!

Product Reviews & Sample Feedback

8,911 Reviews
4.2 out of 5 stars
5 Star
4132
4 Star
3221
3 Star
1203
2 Star
253
1 Star
102
my profile
people who
purchased
sampled
Hair type
Thick
Fine
Straight
Wavy
Curly
Frizzy
Kinky
Dry
Normal
Oily
Hair color
Brown
Blonde
Black
White or gray
Red
Other
Age
17 & under
18-24
25-34
35-44
45-54
55 & over
Apply

Most Helpful Customer Reviews

Be careful
Sampled

Use very sparingly and in small amounts or else your hair will look very greasy

4
Was this review helpful to you? Yes | No 34 of 34 found this review helpful. Was this review helpful to you? Yes | No
Weightless Shine

Love it! I have very very fine, long, color treated hair, so I need a little extra strength/moisture and shine without weighing down my hair any more than usual. I've tried all sorts of serums and glossing creams and stuff in the past with usually average results at best - either I'm not getting the shine results I want or I look like a wet dog, all weighed down with goop. Bought a bottle of this on a whim since I've been such a fan of the other Number 4 products I've sampled, and I'm SO glad I did. This is it.

After a couple of uses, hair is exceptionally shiny and looks healthier than usual. However, my hair is NOT weighed down at all. If anything, it's moving more than usual. And it feels super soft. I'm hoping continued use does improve the health of my hair, but even if not I'd keep using this stuff based on looks alone.

5
Was this review helpful to you? Yes | No 40 of 42 found this review helpful. Was this review helpful to you? Yes | No
It's ok
Sampled

This oil is good at adding shine and defrizzing. It is light weight. I did not think it made my hair feel soft, or that it was repairing anything. I also felt that I had to use a lot of it. I have other oils that I feel are superior.

3
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Love it
Sampled

A little bit goes a long way but boy does it make my hair shiny. It leaves my hair feeling soft and silky.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
A gentle giant of hair oil
Sampled

I was very excited when I tried the Number 4 Fluoro5 Elixer Restore and Repair Oil. My hair felt ultra soft to the touch and really did a great job of managing the flyaway hair I fight with in the winter time.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
nice
Sampled

I really enjoyed this product it wasn't easy at all of my hair really nice and shiny

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Never tried repair oil
Sampled

I'm not sure if it's working to repair or restore, but it doesn't leave my scalp feeling which is a huge problem I usually have.

3
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Really like it
Sampled

Tames my frizzy hair. Thinner consistency than what I am used to but still works. Doesn't really have a smell to it.

5
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Smoothe
Sampled

I'm wearing my hair short and natural gray these days; this added softness to the touch and shine to my hair and calmed down my thick hair.

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Smells great
Sampled

I received this in my monthly birchbox and although i only got a small sample it has lasted me a long time! It works great and it makes my hair smell wonderful! I 100% recommend!

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No