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

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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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Disappointing
SampledPurchased

I received a sample in my monthly Birchbox and ended up purchasing it. Even though I enjoyed my sample, I was disappointed with the full-size product. Over time, I didn't see the same effects on my hair that I noticed when I first started using the product. It didn't feel like it was getting my hair clean.

3
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Love love love
Purchased

This is the best!!! I could not give this to anyone. It has a great smell and is so smooth it leaves your hair silky while you are washing it. Every product they have is great. A keeper !!

5
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Nice!
Sampled

This is perfect for my super super dry chemically treated hair. It smells good too (smell is very important to me) I would buy again

5
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Number 4 is... Number 1!

I have thick, somewhat dry hair that often jumps from tighter curls to dull waves which I know sometimes depends on the products I use ...
Thus, I have to take a moment to sing this shampoo's praises because I noticed a distinct difference in consistency after using my sample bottle of this stuff for a week -- specifically that it gave me the light weight volume & defined texture that I always hope for + my hair stayed fresh & clean feeling for longer between washes.

Ans although it does seem a little expensive to someone like me who is on a fairly tight budget, I genuinely think it is worth the extra buck to have an awesome product that i can count on to give me the results I want everytime.

5
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Earth Conscious

This product is worth every penny! I love the fact that it's completely vegan. It doesn't leave any residue to make my hair fall flat. I have very curly hair and it's difficult to find a hair product that doesn't make it frizzy or flat. I really love every product I've sampled from No. 4!

5
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Good shampoo
Sampled

I like this shampoo. It lathers really well for a sulfate free shampoo. But its didn't strip my color and smells good. Would purchase in the future

4
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Let your hair take drink

Winter has a way of drying out your hair or over shampooing, styling or color can make your hair dull but this product can really give your hair the drink it needs. When other products can leave your hair lack luster or greesy this gives a refreshing change love love love it

4
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Great scent, nice body to hair
Sampled

Very nice scent to the shampoo, only requires a small amount to work in to your hair. Killer body and feel after as well. I use wax based pomade and it pairs perfectly.

5
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Decent shampoo
Sampled

This shampoo did not do anything special, but it is perfect to take when you travel because it's definitely better quality than those you find in hotels or even from the drugstore.

2
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