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 sulfate-free 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. The brand's four signature Liquid Complexes—blends of natural extracts—work to protect, strengthen, and purify strands without weighing them down.

How to Use

Dispense into hands and rub together to form a lather before massaging into wet hair. Lather and rinse, then 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

5,102 Reviews
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1637
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1830
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292
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260
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Most Helpful Customer Reviews

great sample

I liked the smell of the shampoo & the texture it gave my hair. Made it very easy to blow out & style.

4
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No 4 Shampoo

Although I like the No 4 clarifying shampoo, I don't care for this one. I felt like it dried my hair out. I also didn't care too much for the smell.

3
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Volume shampoo

I don't need a volume shampoo but my husband has fine hair and really liked it this one. I will probably buy the shampoo and conditioner for him when he runs out of his current brand.

4
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Great product!

I was kind of skeptical about this product, but I do think it really did add volume to my normally flat hair! I may actually think about purchasing this in the future

4
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Simple with great texture

This shampoo added nice volume and was pleasant to use.

4
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shampoo

Finally a number 4 product that smells good. So tired of getting shampoo samples from this brand.

4
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Clean and fresh shampoo

I liked the scent of the shampoo in addition to how it felt like it rinsed clean. Only thing I didn't like was the texture I felt in my hair after use.

4
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Great shampoo

This shampoo works very nicely. I only shampoo a few times a week and I am always happy with how my hair feels after using it. Great product - but I feel like it's pretty expensive.

5
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Hair

This sample was a nice size and I was able to use a few tries. It was a decent shampoo and worked good. The smell was nice also. All in all it is a great sample.

4
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Effective

I was surprised after using this shampoo that it was sulfate free- it still lathers up nicely and makes your hair feel very clean. I didn't really notice a huge difference as far as volume goes, slightly maybe but not wow.

4
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