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

5,458 Reviews
3.8 out of 5 stars
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1756
4 Star
1963
3 Star
1168
2 Star
305
1 Star
266
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Most Helpful Customer Reviews

shampoo
Sampled

Great smell and works well. I like that it doesn't weigh my hair down.
I would recommend this product to my friends definitely!

5
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Love this brand!!!
Sampled

This is the third shampoo I have received from Number 4 and I have loved them all! This shampoo does what it says it will. It gave me great volume and softness! Keep sending these samples my way Birchbox!!!

5
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Awesome
Sampled

I really love this stuff!!! Wish the sample was a little bigger but it's great! I will definitely try the other products in the future!

5
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Not a favorite
Sampled

I really did not like the way this shampoo made my hair feel. It felt strawish and I did not particularly like the smell.

3
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Works Well
Sampled

I like this product - smells nice and fresh. Left my hair with more body (I round brush blow dry).

4
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Loved
Sampled

Worked great! Left my hair soft, came with plenty to try it multiple times. Smelled lovely as well. I will definitely think about purchasing.

5
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Volumizing shampoo
Sampled

Seemed to leave my hair a little fuller. Would have liked to try the conditioner with it to get full effect. Ok shampoo.

3
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Delivers!
Sampled

Smells fabulous. No yucky ingredients. Hair felt great. This one is a winner - I'll be purchasing this product and more from this line soon!

5
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Wished it was a bigger sample!
Sampled

I really enjoyed this shampoo, however I have thick, long hair and wish I would have had the opportunity to use it a few times in a row. I liked it enough to purchase it and try it for a longer period of time.

5
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Oh, the volume

This shampoo does as promised! I'm not much for volume but I had about 20% more after just one wash

4
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