Biotin Thickening Conditioner

This thickening conditioner will prolong vitality and enhance shine.

Purchase Options

High-performance

Award-winning

Vegan

Cruelty-free

How to use

Step 1
Apply to mid-lengths and work through ends.
Step 2
Leave on for 1-2 minutes.
Step 3
Rinse.

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IN THE WILD

WHAT PEOPLE ARE SAYING

4.8
Rated 4.8 out of 5 stars
Based on 198 reviews
198 reviews
  • Candace H.
    Verified Buyer
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    September 30, 2026
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    Reviewing
    DALLAS Biotin Thickening Conditioner Retail Liter
    Rated 5 out of 5 stars
    Serous Thickening.

    I cannot believe how incredible this conditioner feels! My hair texture is extremely fine, and I've never used a thickening conditioner that actually made my hair feel any different... until now. I cannot believe how incredibly thick and soft my hair feels after using this conditioner. I've never spent this much money on a conditioner before and I was extremely skeptical about its efficacy, but I've been so delighted with all my other R&Co products that I decided to give it a try. I picked up one of the little travel-size bottles to test the product before going all in, and I was convinced after a single use. I'll never go back to regular conditioner again!

  • Nicole W.
    Verified Buyer
    Hair Type Straight
    Hair Density Medium
    What is your main hair goal? Volume + Texture
    September 15, 2026
    Hair Type Straight
    Hair Density Medium
    What is your main hair goal? Volume + Texture
    Reviewing
    DALLAS Biotin Thickening Conditioner Mini
    Rated 5 out of 5 stars
    Love this, it works!

    Love the whole Dallas line. Immediately turned around and bought the full size after a week with this mini. Hair feels healthier and thicker!

  • Karen M.
    Verified Buyer
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Hydration + Repair
    September 15, 2026
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Hydration + Repair
    Reviewing
    DALLAS Biotin Thickening Conditioner
    Rated 5 out of 5 stars
    Favorite shampoo

    I absolutely love this shampoo. I have fine, thin hair and it feels much healthier after using this for a few weeks. The scent is amazing too.

  • Carolyn F.
    Verified Buyer
    Hair Type Straight
    Hair Density Medium
    What is your main hair goal? Volume + Texture
    September 10, 2026
    Hair Type Straight
    Hair Density Medium
    What is your main hair goal? Volume + Texture
    Reviewing
    DALLAS Biotin Thickening Conditioner
    Rated 5 out of 5 stars
    Dallas Thickening Conditioner

    I like this product but wish the bottle did not have such a narrow opening.

    R+Co
    September 11, 2026

    Thank you so much for your 5-star review, Carolyn! ✨ We're really glad to hear that you're loving DALLAS Biotin Thickening Conditioner!

    We totally hear you about the bottle opening — that's definitely helpful feedback! We understand how frustrating it can be when the packaging design makes it tricky to dispense the product easily, especially when you're in your shower routine. Your input about the bottle design is really valuable to us, and we appreciate you taking the time to share that with our community.

    Thanks so much for giving DALLAS a try and for being part of the R+Co family! 💫

    With gratitude,
    The R+Co Team

  • Kelly C.
    Verified Buyer
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    August 19, 2026
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    Reviewing
    DALLAS Biotin Thickening Conditioner
    Rated 5 out of 5 stars
    Great!

    I love this conditioner. My hair is very fine and, unfortunately, thinning. This conditioner does such a nice job conditioning my hair without weighing it down. I also love the smell!