Biotin Thickening Treatment

Helps build texture for a long-lasting, voluminous effect.

Purchase Options

High-performance

Award-winning

Vegan

Cruelty-free

IN THE WILD

WHAT PEOPLE ARE SAYING

4.5
Rated 4.5 out of 5 stars
Based on 100 reviews
100 reviews
  • Holly A.
    Verified Buyer
    Hair Type Straight
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    October 6, 2026
    Hair Type Straight
    Hair Density Fine
    What is your main hair goal? Volume + Texture
    Reviewing
    DALLAS Biotin Thickening Treatment
    Rated 5 out of 5 stars
    Wonderful

    I tried this product once and had amazing results! My hair is thinning due to perimenopause and this added so much volume and texture. It also held curls longer even in the heat.

  • Margaux B.
    Verified Buyer
    Hair Type Wavy
    Hair Density Medium
    What is your main hair goal? Hydration + Repair
    September 21, 2026
    Hair Type Wavy
    Hair Density Medium
    What is your main hair goal? Hydration + Repair
    Reviewing
    DALLAS Biotin Thickening Treatment
    Rated 5 out of 5 stars
    Great product

    Only used it once so far, but I can already tell I'll be a big fan!

  • Joy S.
    Verified Buyer
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Curl Care
    August 13, 2026
    Hair Type Wavy
    Hair Density Fine
    What is your main hair goal? Curl Care
    Reviewing
    DALLAS Biotin Thickening Treatment
    Rated 5 out of 5 stars
    The best!!

    I don’t know how I lived without this before! I have fine hair that needs some weight and this makes it smooth and voluminous and I love it so much. I personally locs the smell, too.

  • Hayley
    Verified Buyer
    Hair Type Straight
    Hair Density Fine
    July 20, 2026
    Hair Type Straight
    Hair Density Fine
    Reviewing
    DALLAS Biotin Thickening Treatment
    Rated 3 out of 5 stars
    Nice treatment but the smell

    The treatment is really nice for my fine hair, but the only issue is I can't use it as often as I should because I can't stand my hair smelling like this after. I would describe the scent as Axe body spray adjacent.

    R+Co
    July 20, 2026

    Thank you for your honest 3-star review about our DALLAS Biotin Thickening Treatment, Hayley! ✨ We're so glad to hear that the treatment is working really well for your fine hair - it's wonderful that you're experiencing the thickening benefits the formula is designed to deliver!

    We're really sorry to hear about your experience with the scent though. We totally understand how fragrance can be such a personal thing, and when a scent doesn't work for you, it can really impact how often you feel comfortable using a product. Your "Axe body spray adjacent" description definitely gives us a clear picture of what you're experiencing, and we can see how that would be off-putting for your hair routine.

    It's especially frustrating when you love how a product performs but the scent holds you back from using it as frequently as you'd like to get the full benefits. We know consistency is key with treatments like DALLAS, so we completely understand your dilemma about not being able to use it as often as you should.

    Your feedback about the scent is incredibly valuable to us. We appreciate you taking the time to share both what's working well (the treatment benefits for your fine hair) and what's challenging (the fragrance experience). This kind of detailed input really helps us understand the full customer experience with our products! 💫

    With gratitude,
    The R+Co Team

  • RACHEL
    Verified Buyer
    July 1, 2026
    Reviewing
    DALLAS Biotin Thickening Treatment
    Rated 5 out of 5 stars
    Love!

    I grabbed this along with the Dallas shampoo and love using them together!