Editor's TipEditor's Tip

Post lather, spritz strands with a leave-in conditioner like Number 4 Super Comb Prep & Protect.

Number 4 Hair Care

Birchbox Breakdown

At the end of a long day we could all use a fresh start—the same goes for our hair. When product buildup and styling stress leave your locks feeling dull, use Number 4™ Clarifying Shampoo, subtly scented with white freesia, golden amber, and warm musk, to gently cleanse without stripping moisture or color.

How it Works

Rich in vitamins and antioxidants, this clarifying shampoo restores health and shine to overworked tresses. Black currant and soy restore vibrancy; acai berry and vitamin C deliver youth-boosting antioxidants; Oolong tea and Irish moss defend against environmental damage; and lemongrass and oatmeal gently cleanse and purify. This shampoo is also vegan friendly and free from sulfate, sodium chloride, and parabens.

How to Use

Squeeze one pump (a little goes a long way) of the water-activated formula into the palm of your hand and work into a thick lather. Deposit the lather evenly through damp strands and rinse thoroughly. Use daily for best results.

Water, Decyl Glucoside, Disodium Cocoyl Glutamate, PEG-120 Methyl Glucose Dioleate, Fragrance, Polysorbate 20, Sodium Cocoyl Glutamate, Gluconolactone, Polyquaternium-10, Sodium Benzoate, Benzyl Salicylate, Butylphenyl Methylpropional, Linalool, Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde, 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, 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

224 Reviews
3.9 out of 5 stars
5 Star
78
4 Star
84
3 Star
42
2 Star
12
1 Star
8
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Most Helpful Customer Reviews

Number 4
SampledPurchased

I love this shampoo. It locks in moisture so well that I don't feel like I need to add conditioner to my hair. It leaves my hair feeling soft and smelling great. The only negative is that it doesn't lather well. Other than that it, it does what it says it does. I would recommend this product.

4
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Great shampoo
Sampled

Smells great, lathers nicely, leaves hair clean and soft. My hair is fine and it gave me nice body without weighing it down. Helped with manageability.

4
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Not so much
Sampled

This clarifying shampoo made my hair pretty limp and I wasn't a huge fan of the scent.

1
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Felt Drying
Sampled

Living in a dry climate and having thin hair, this only dried out my hair and left it feeling crispy. Good thing I had some Beauty protect hair oil to apply afterwards. Will not use this again.

2
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Great Shampoo
SampledPurchased

If you have very thick, very curly or wavy hair that requires a lot of product to tame it (leave-in conditioner, oils, serums, etc.) this shampoo is fantastic because it really does leave your hair feeling brand-new and with no product buildup after using it, but still soft and shiny. I actually need less and fewer of the conditioning and smoothing products after using this shampoo.

I never thought I would spend $72 on a bottle of shampoo, but I've honestly never experienced such a perfect one- including at the salon. It's also actually not a bad value because, even if you do have tons and tons of hair like I do, they aren't kidding when they say that you only need a dime-sized amount to lather it up and wash through all of your hair.

5
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Average
Sampled

I really like that this product is vegan. It smells really good, but I did not notice my hair felt particularly clean after using it. My hair felt somewhat clean and a little dry. I think it's really hard to find a clarifying shampoo that actually works that is also vegan.

3
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Honestly, just okay
Sampled

This shampoo worked cleaned and softened my hair but I didn't think that it was absolutely wonderful to be honest. It only smelled okay and it dried my hair out a bit.

3
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AMAZING
Sampled

I have never had a shampoo that I felt Cleansed my hair the way that this product did. I loved the scent and will be purchasing this product in the future. Thankful for getting birchbox to discover new, fun products like this that I may have never tried before now.

5
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Best Shampoo Ever
Sampled

I am a blonde and after two uses of this shampoo, I swear my hair has gotten blonder. Additionally, it leaves my hair feeling clean, soft and smooth! Even if I do not use conditioner, my hair isn't tangled!

5
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Number 4 Clarifying Shampoo
Sampled

I was excited to try this shampoo as I was out of my normal clarifying shampoo. The shampoo is very concentrated, so a little does go a long way. I was disappointed to find this shampoo left my hair feeling weighted and oily, not at all what I expected in a "clarifying" shampoo. I would highly recommend this for those with thick, dry hair.

3
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