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!
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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
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In love

This brand of products is my new favorite. The design is great, the formula is amazing and the smell is awesome. And my hair feels so great after using this.

5
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LOVE THIS SHAMPOO
Sampled

Smells so good, makes hair super soft. The conditioner also works well and smells so good. Only drawback is the "container", can't see how much you have and fear I will not be able to get all the product out of it.

5
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BEST SHAMPOO EVER!
Sampled

I absolutely loved this shampoo! the smell was amazing. it made my hair so soft and the smell stayed in my hair throughout the day. I loved how it made me feel like I had just gotten my hair done at a salon. Definitely going to purchase a full size soon!

5
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Great Shampoo
Sampled

This was a great shampoo. Very hydrating, love the smell. Made my hair very easy to style. This will make my favorites list!

4
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number 4 hydrating shampoo
Sampled

love the whole number 4 product line. i felt a difference in my hair after 1 use and didnt feel really good

5
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Enjoyed it!
Sampled

It did the job! I only got one use out of the sample but I have a ton of hair. It left my hair feeling clean and when blown out looked great!

4
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Amazing for dry hair!
Sampled

I have long curly hair and I have never been able to just use shampoo! I always have to use conditioner. But not with this stuff!!!! My hair felt so great, I did not feel the need to use conditioner! My hair was extremely manageable and felt amazing and smelled amazing too!

5
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Clarifying but also Counterintuitive
Sampled

This is a good clarifying shampoo to use when your hair is too oily or over-conditioned, but otherwise it can be drying. It smells great and when used in the right circumstances, leaves hair feeling light and bouncy. However, it is so thick that it needs to be diluted with water before being applied to hair- otherwise you're left with a glob of it sitting at one spot on your head, too thick to be spread anywhere. This thickness issue is hard for me because like all real working women, I am usually in a rush in the shower and generally run on autopilot. So adding in that extra step was tough, and I ended up with an un-even wash:(

2
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SMELLS AMAZING
Sampled

This entire line smells amazing!!! I will def be purchasing soon! I recently used a hairspray from a friends box and it's the best smelling line I've ever seen or used.

5
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