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

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Most Helpful Customer Reviews

Just ok

Loved how the product lathered and left my hair feeling clean, but didn't find that it added much volume.

4
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Shampoo

While it does a better job of cleaning my hair than their clarifying shampoo does (which is so syrupy thick it's difficult to wash out thoroughly), it still doesn't seem to get my hair that clean. I get that this stuff is supposed to be concentrated and you lather it first, but it's so thick it doesn't get my hair very clean. It smells great, but I've had better luck with much cheaper shampoo (I always use sulfate free, so that is not the issue).

3
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nice volumizing shampoo

First of all this shampoo smells good. I used it on my hair and it makes my hair soft anf fuffly. For people who live in humid weather places this shampoo can help make hair look less flat.

3
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volumizing shampoo

I didn't really need this product but I tried it anyway and it really works well. I didn't think it would work for my thick hair. If I needed more volume I'd definitely buy this product. I just wish I could've tried the conditioner with the shampoo.

4
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No extra volume

The shampoo made my hair very soft, but I didn't notice any extra volume. I'm not crazy about the smell, either. The sample size is good for me, I have short hair so I've gotten 4 uses out of it. I don't think I'll be purchasing this, though.

4
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Nice product

I have flat hair and this was very helpful. Probably would be more effective when used with the conditioner

4
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Love the smell, a little goes a long way!

This smells divine- I'd like to find matching perfume! And while it seems expensive, I use a third of the amount that I usually use to get such a good lather. I think it does add volume, though it would have been nice to be able to sample the matching conditioner at the same time.

5
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Great Shampoo!!!

I'm not usually one to fall for a shampoo, but this one was so nice in so many ways. It had a nice thickness to it that made lathering up easy, the smell was great, and the overall effect on my hair was better than using my normal shampoo. This might be one to splurge on sometime in the future.

5
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great jfor my thin hair

I have really thin long hair. I need all the volume help I can get. I really liked this and felt it helped my hair have a little more oomph.

4
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Pleasant Shampoo

I've got thick curly hair and this shampoo didn't add to the frizziness which is always good. It left my hair feeling pretty smooth and it has a pleasant but subtle smell. Not sure I'm so in love with it that I feel the need to purchase but I'll keep it in mind.

4
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