Editor's TipEditor's Tip

You can use this mild shampoo every day without worrying about drying out strands. For best results, follow with L’eau de Mer Hydrating Condition and use Lumiere d’hiver Reconstructing Masque once a week.

Number 4 Hair Care

Birchbox Breakdown

Whether your hair is over-processed and brittle or just chronically dry, this is the shampoo for you. The satiny formula is gentle enough to use every day and helps to soften and hydrate strands with natural essential oils and extracts. Free of parabens and sulfates, it foams into a rich lather that leaves hair soft and shiny. Vitamin B5 conditions hair and silicone bumps up the gloss factor, while the brand’'s patented Liquid Complexes help protect, purify, strengthen, and revitalize hair.

How to Use

The concentrated formula goes a long way. Depending on hair length and thickness, apply one or two pumps of shampoo to your and work into a lather. Work into wet strands and rinse thoroughly and follow with Number 4 Hydrating Condition.

Water, Sodium Cocoyl Isethionate, Sodium Lauryl Sulfoacetate, Cocamidopropyl Hydroxysultaine, Disodium Laureth Sulfosuccinate, Sodium Lauroyl Sarcosinate, Cocamidopropylamine Oxide, Fragrance (Parfum), Divinyldimethicone/Dimethicone Copolymer, Glycereth-26, Glycol Distearate, Gluconolactone, Disodium Cocoyl Glutamate, Lauryl Alcohol, Decyl Glucoside, Quaternium-91, Panthenol, Guar Hydroxypropyltrimonium Chloride, Amodimethicone, PPG-3 Benzyl Ether Myristate, Sodium Benzoate, PEG-120 Methyl Glucose Dioleate, Sodium Cocoyl Glutamate, C11-15 Pareth-7, Trisodium Ethylenediamine Disuccinate, Laureth-9, Glycerin, C12-13 Pareth-23, C12-13 Pareth-3, Polyquaternium-7, Dihydroxypropyl PEG-5 Linoleammonium Chloride, Trideceth-12, Linalool, Helianthus Annuus (Sunflower) Seed Oil, Hydrolyzed Vegetable Protein PG-Propyl Silanetriol, Sodium Ascorbyl Phosphate, Hydrolyzed Soy Protein, Macrocystis Pyrifera Extract, Ribes Grossularia Fruit Extract, Ribes Nigrum (Black Currant) Leaf Extract, Yogurt 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!
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

5,991 Reviews
4.0 out of 5 stars
5 Star
2205
4 Star
2175
3 Star
1159
2 Star
307
1 Star
145
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

Giving it a try.

I liked the fact that it lathered up really well, but the smell bothered me. Still, it did seem to moisturize my hair so I might try it again.

4
Was this review helpful to you? Yes | No 3 of 3 found this review helpful. Was this review helpful to you? Yes | No
Love

Took me a while to appreciate the natural clean scent of this product, but it's honestly amazing and good for your hair!

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

This one didnt do much for me. My hair is in rough shape. maybe better for softer hair, less damaged.

3
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Good Product
Sampled

Great moisturizing shampoo. My hair was less frizzy after using. Taking off one star as the fragrance though not unpleasant was not my favorite

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Its a good shampoo
Sampled

I like this shampoo. It lathers well. My color treated hair did well with it. Non drying and doesn't smell bad.

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
first time was good
Sampled

My hair is fine and highlighted, so I have to alternate between volumizing shampoos and hydrating... This seems to be a good candidate for the hydrating side of things.

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Shining Shampoo
Sampled

This was a great smelling, moisture boosting shampoo. I took it on a trip when I typically feel like everything is dry from flying and was pleased with the fullness my hair had, the scent of the shampoo, the texture it left my hair with.

4
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Decent shampoo
Sampled

When I first cracked this shampoo open, I thought the scent was a little strong, but nice. However, actually using it, the scent is incredibly strong and musky, and just too much. As for the hydrating- I do have dry hair, and this didn't dry it out further, but it didn't really do anything to improve my hair after using it til it ran out. My hair looked and felt the same, but the smell gave me a headache.

2
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Stinky
Sampled

The shampoo is actually pretty rich and luxurious feeling and a little goes a long ways, but the smell is not my favorite. It's an earthy/patchouli type smell that was incredibly strong and even overpowered my normal scent....which I use body wash, lotion and perfume layered. Very strong. Was not a fan.

2
Was this review helpful to you? Yes | No   Was this review helpful to you? Yes | No
Perfect Shampoo
Sampled

This is an awesome shampoo for colored, frequently-styled, or fine/dry hair.
I have naturally curly strands, which have a tendency to get weighed down and lose their bounce when I use rich, “hydrating,” products.
I subject my hair to Brazilian Blowouts + Keratin treatments, as well as, hot irons for styling. Because of this, I don’t like to use too many clarifying products in fear that it will strip my (already-delicate) hair! This hydrating Number 4 Shampoo, however, removes any/all buildup at the root, and still leaves my hair feeling bouncy and clean without any dry or brittle strands. Highly recommend it!

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