Editor's TipEditor's Tip

For best (ie: biggest) results, follow with Number 4 Volumizing Condition, which adds both body and shine.

Number 4 Hair Care

Birchbox Breakdown

This singular shampoo proves that style and substance aren't mutually exclusive. The sleek packaging and fresh scent are a nod to Parisian flair, while the scientific formula is designed to turn fine, flat strands into rich, full-bodied hair. (No strings attached.)

How it Works

This sulfate-free formula is designed to detangle and cleanse hair without weighing it down. It uses natural lemongrass, golden seal, and gooseberry, plus the brand’s four signature Liquid Complexes™. Each complex is a different blend of natural ingredients designed to help protect, purify, strengthen, and revitalize hair.

How to Use

Emulsify in hands and massage into wet hair. Lather. Rinse. Follow with Volumizing Condition.

More for You!
  • Free returns within 90 days of purchase
  • Extra samples and gifts in the Bonus Shop

Product Reviews & Sample Feedback

4,510 Reviews
3.8 out of 5 stars
5 Star
1453
4 Star
1583
3 Star
958
2 Star
265
1 Star
251
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Most Helpful Customer Reviews

great shampoo
Sampled

i was look for a shampoo for grey/ white hair.she suggested this product to make my hair full-bodied.love this product,great shampoo.makes my hair silky and smoothe wish you had aproduct like this to take care of white hair thomas

5
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Best shampoo
Sampled

I LOOOVE this shampoo!!! My hair wasn't frizzy. I want the full product.

5
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great
Sampled

Best product ever! Makes my face so clean and clear! Never using another product again! Such a great little find! Thanks birch box!

5
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Amazing

This product is great. I love the smell... it lasts all day. I have very thin hair and it can get weight down by heavy shampoo and this is meant to give volume and it does! I usually have to wash my hair every day because most shampoos make my hair oily, I can go two days with Number 4. I wish it was less but it's such high quality.

5
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Great Shampoo
Purchased

I have very fine hair. I sampled this and had to buy it. My hair looks thicker, keeps the style all day and best of all smells good. I will buy this again.

4
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Love this
Sampled

I love this and several other No. 4 products. I purchased the Super Comb Prep & Protect, Volumizing Shampoo and Volumizing Conditioner soon after trying in my Birchbox. They are my favorite products which I use everyday. I will continue buying and would recommend to anyone!

5
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Worked great!
Sampled

I really liked this product. I felt like my hair had lots more volume after using it. It also felt very smooth and soft.

5
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Ok
Sampled

It was ok ! Don't think I would go out a buy. Glad I got to try it out first!

3
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great shampoo
Sampled

i really love this brand. this product works very well on mixed hair, oily and dry. the smell is very soft. the presentation is very elegant.

5
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Hair
Sampled

I did not find this product very good at cleaning nourishing and replenishing.

1
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