Editor's TipEditor's Tip

This is one area where matching makes sense. Pair this conditioner with Number 4 Volumizing Shampoo to get the best results.

Number 4 Hair Care

Birchbox Breakdown

Even fine hair needs a good conditioner. This sulfate-free formula detangles and softens hair without weighing it down. You’ll be left with smooth, manageable hair that is noticeably fuller and more dynamic. Did we mention it also smells spectacular?

How it Works

There are zero sulfates or parabens in this formula, but there is vitamin B, which helps to fortify and moisturize strands. It also contains the brand’s four signature Liquid Complexes™, which are blends of natural ingredients designed to help protect, purify, strengthen, and revitalize hair.

How to Use

After shampooing, squeeze out excess water from hair. Apply one or two pumps of conditioner (depending on length), concentrating on mid-shaft and ends.

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

Product Reviews & Sample Feedback

4,403 Reviews
3.6 out of 5 stars
5 Star
1147
4 Star
1426
3 Star
1089
2 Star
369
1 Star
372
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Most Helpful Customer Reviews

Hair
Sampled

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

1
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Continued from the shampoo
SampledPurchased

I have yet to use this without using the shampoo, but it does a rather great job of adding volume to my hair. This 8.5oz size is great to try the product and use sparingly, but it simply isn't enough quantity to sustain for very long. The conditioner ran out much faster than the shampoo, nearly 1.5x the usage from a 8.5oz container.
My only question is whether or not I can maximize my utility by substituting for a cheaper shampoo/conditioner alternative and utilize additional hair product to replicate the results I get from this brand.

4
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Average
Sampled

Not enough in sample to use enough to really tell if the product works like it says

3
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another meh product
Sampled

smells good, works okay; nothing special though really. Could take or leave it. Won't be buying again. Was worth the try though. Same performance as their shampoo

2
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Smells good and makes hair soft but does not work well for curls
Sampled

My hair is curly, and I did not find it gave my hair any lift at the roots. However, it does smell very nice and did leave my hair feeling soft.

3
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smells great but does nothing for my hair

I've read a few other reviews about the smell being a bit much, but I actually loved the smell. It's a shame the conditioner doesn't actually do anything for my hair. In fact, it was difficult just to distribute through my hair due to it's weird consistency. It left my hair limp, tangled, and not the least bit moisturized, which I am pretty sure is the opposite of what a conditioner should do. Thankfully, I tried this as a sample, so not too much of a loss on my end. I would not purchase the full size, especially at the absurd asking price, and would not recommend it to others.

1
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Perfect
Sampled

I love this brand and everything they offer. Smells great and my hair soaks it up! Love love love this!

5
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Heavy scent
Sampled

Brought the sample with me on an overnight trip so I had a better quality conditioner than what they usually give at the hotel. It didn't soften or smooth my hair, and I found the scent to be much too heavily perfumed. I actually found it so overwhelming it gave me a bit of a headache and couldn't wait to wash it out.

1
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Nice smell, not very manly though...
Sampled

Same as the shampoo... the smell is nice and relaxing and it feels good on head (nice lather), however it is expensive for what it is.

3
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I wanted to love it...
Sampled

I really wanted to love this product. I had loved loved loved the clarifying shampoo. My hair would feel amazing after using it. I also enjoy the Prep & Protect sample I have (keep it in my travel bag). While this product did work well with the volumizing aspect, it also left tangles in my hair (which is an impressive feat for how thin my hair is). Also, I found that if I use even a touch bit too much, the smell is incredible overwhelming. I'm not usually so sensitive to smells but this one gives me a headache and makes me feel light headed. I've use this three times and it is the only common factor of my showers.

1
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