Editor's TipEditor's Tip

For the ultimate nourishment, treat your hair daily to Number 4™ Fluoro5 Elixer Restore & Repair Oil.

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.

How it Works

Number 4™ uses vitamin B5 to condition hair and silicone to bump up the gloss factor, plus the brand’s patented Liquid Complexes™. Each of the four complexes is a different blend of natural ingredients, designed to help protect, purify, strengthen, and revitalize hair.

How to Use

The concentrated formula goes a long way. Apply one pump to wet strands and work into a lather. Rinse thoroughly, and follow with 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

185 Reviews
3.9 out of 5 stars
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70
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58
3 Star
39
2 Star
12
1 Star
6
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Most Helpful Customer Reviews

GREAT product for curly, dry locks

I have very dry, very course curly hair and I often have difficulty finding products that give my hair adequate hydration but don't weigh my curls down. This stuff is FANTASTIC!! It gave my hair body, lift, enhanced my curls, and plenty of moisture! I'm only giving it four stars because 1) It's really, really pricey, especially for my budget and 2) I wasn't crazy about the scent. If not for those issues, would have been a 5 star all the way.

4
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Great sample

After getting their detangling spray samples in the past I've grown fond of this brand and was pleased to receive a shampoo.....I love the smell, very unique, and a very relevant sample considering how dry my hair gets....Because I have long thick hair, these samples don't really help me decide if I'd want to spend so much on a full size though...

4
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Best hydrating shampoo I've used
Purchased

I was hesitant in using this when I recieved a sample until I read it was free of sulfates and parabens. So glad I tried this. After only one use it made such a difference in my hair that I ordered the full size bottle. Very expensive however a little goes a long way and the bottle has lasted a long time.

4
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Number 4 Hydrating Shampoo

I really loved this shampoo! I really wish they would have included the conditioner too. Very good product overall. Would definitely purchase.

4
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Works great

I like how it controls my hair in what is already a humid spring for us. I can go longer between washes. The price point is the only problem but I imagine the big bottle will last forever.

4
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Interesting

Just not enough in package to really see if it works as well as it advertised to do, but I love the smell and what it did you, I just have a lot of hair.

3
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good shampoo

I liked this product. I don't understand how it foamed even though it is supposed to be sulfate and paraben free. I also think that it is overpriced for what it is - but overall a good shampoo.

4
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Love this shampoo!

I was hesitant to try this shampoo, but after the first try I love it! It works wonders for my slightly oily hair. Usually I will have to wash it after one day, but with this shampoo I can add an extra day. Living in a very humid climate this shampoo saved my hair!

5
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Good

Smells great, works well on my hair. I don't like how it claims to be sulfate-free, yet it is absolutely not. All you have to do is check the ingredient list.

3
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The smell!
Purchased

The hydration is really good - I need it living in Alaska. But, it was the smell that sold me. Sultry. And, my brother-in-law and my husband BOTH commented on how good my hair smelled within a day of each other when I used the sample. Ummm, wow. Been married 16 years - that never happens! This stuff is pricey, but I wait until I have a decent amount of points and then get the big bottle. I don't need much, which is also nice. Though, if you like the stuff that gets big and foamy - this is not the shampoo for you.

5
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