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R+Co Dallas Biotin Thickening Shampoo | Thickens, Nourishes + Strengthens | Vegan + Cruelty-Free |

4.4 4.4 out of 5 stars 4,796 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Hair Shampoo by R+Co

Sustainability features

This product has sustainability features recognized by trusted certifications.

Packaging efficiency

Reduced air and/or water in the product or packaging for more efficient transportation.

As certified by
Compact by Design (Amazon-developed Certification)
Compact by Design (Amazon-developed Certification)
Compact by Design (Amazon-developed Certification) Compact by Design (Amazon-developed Certification)

Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

Learn more about this certification

Part of
Climate Pledge Friendly
R+Co
Premium Brand Sourced

We work closely with your favorite premium beauty brands and their approved resellers to ensure the premium products sold in our stores are authentic.

Learn more
Price: $38.00 ($4.47 / Ounce) FREE Returns
8.5 Ounce (Pack of 1)
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Purchase options and add-ons

Brand R+Co
Item Form Liquid
Hair Type Thin
Scent Floral
Age Range (Description) Adult

Description

For big, beautiful, bouncy hair, use DALLAS. This thickening shampoo adds vitality to fine, flat hair while nourishing and strengthening from root to tip

Benefits

Thickening, Nourishing, Strengthening, Rejuvenating, Volumizing, Thermal Protection, UV Protection

Suggested Use

Apply to the middle of your hair and work through to the roots and ends.
Complete the regimen
Discover product recommendations selected by Amazon Buyers
R+Co Dallas Biotin Thickening Shampoo | Thickens,...
$38.00
$40.54

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R+Co Dallas Biotin Thickening Shampoo | Thickens, Nourishes + Strengthens | Vegan + Cruelty-Free |
$38.00 ($4.47/Ounce)
Get it as soon as Tuesday, Apr 30
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Ships from and sold by Amazon.com.
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R+Co Dallas Biotin Thickening Conditioner | Weightless Hydration, Strengthens + Enhances Shine | Vegan + Cruelty-Free |
$38.00 ($4.47/Fl Oz)
Get it as soon as Tuesday, Apr 30
In Stock
Ships from and sold by Amazon.com.
+
R+Co Rodeo Star Thickening Foam, Adds Dramatic Volume to Fine to Medium Hair
$38.00 ($7.60/Ounce)
Get it as soon as Tuesday, Apr 30
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Sustainability features

Sustainability features

This product has sustainability features recognized by trusted certifications.

Packaging efficiency

Reduced air and/or water in the product or packaging for more efficient transportation.

As certified by
Compact by Design (Amazon-developed Certification)
Compact by Design (Amazon-developed Certification)
Compact by Design (Amazon-developed Certification) Compact by Design (Amazon-developed Certification)

Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

Learn more about this certification

Part of
Sustainability features
Climate Pledge Friendly

From the manufacturer

Dallas Shampoo
DALLAS Thickening Shampoo

Compare: Volume

Thin, Fine Hair

Good For:

Medium hair

strengthen+keratin

Benefit:

Instant thicken hair

6/10

Volume:

5/10

N/A

Hold/Memory:

7/10

Thin, Fine Hair

Good For:

Every length hair

strengthen+keratin

Benefit:

Mega-volume at root

6/10

Volume:

8/10

N/A

Hold/Memory:

6/10

Thin, Fine Hair

Good For:

Fine hair/dry volume

strengthen+keratin

Benefit:

Long-lasting volume

6/10

Volume:

8/10

N/A

Hold/Memory:

7/10

Thin, Fine Hair

Good For:

Thin, Fine Hair

strengthen+keratin

Benefit:

strengthen+keratin

6/10

Volume:

6/10

N/A

Hold/Memory:

N/A

Learn More
Learn More
Learn More
Learn More

Complete the Look

Rodeo Star Mobile

RODEO STAR Thickening Foam

For big, beautiful, bouncy hair. This thickening shampoo adds vitality to fine, flat hair while nourishing and strengthening from root to tip.

Dallas Biotin thickening conditioner

DALLAS Thickening Conditioner

The final step for hair as big as Texas. This thickening conditioner will prolong vitality and enhance shine.

Dallas Thickening Spray

DALLAS Thickening Spray

Quintessential spray for a mega blow-dry. Great for volume at roots, control at ends and an overall smooth look. Tons of body and shine w/o stiffness.

Death Valley Mobile

DEATH VALLEY Dry Shampoo

The quickest way to get volume and body into your hair. This dry shampoo absorbs extra oil and adds texture for an untamed look.

About R+Co

Focus on sustainability

Compact by design from Climate pledge friendly. Certified by Amazon.

Small changes in product size & weight lead to lower carbon emissions.

We created Compact by Design to identify products that, while they may not always look very different, have a more efficient design. With the removal of excess air and water, products require less packaging and become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

Here are a few of the many ways products can qualify:

Less packaging

Less air in container

More efficient shape

Waterless technology

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.3 x 2.3 x 5.6 inches; 9.6 ounces
  • Item model number ‏ : ‎ 810374024843
  • UPC ‏ : ‎ 810374029831 810374024843 810374020555
  • Manufacturer ‏ : ‎ R+Co
  • ASIN ‏ : ‎ B017GGC9BI
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.4 4.4 out of 5 stars 4,796 ratings

Looking for specific info?

Customer reviews

4.4 out of 5 stars
4.4 out of 5
4,796 global ratings

Customers say

Customers like the quality, smell and effect of the shampoo. They mention that it's a great product that leaves their hair feeling clean and soft. They also appreciate the effect it has on their hair, mentioning that it gives good body and thickness. Customers also like the volume, style, and comfort. However, opinions are mixed on value.

AI-generated from the text of customer reviews

164 customers mention131 positive33 negative

Customers like the quality of the shampoo. They say it's a great product, it leaves their hair feeling clean without stripping their scalp and leaving it dry. Some say that it does a good job of cleaning their fine oily hair and that it smells ok. Overall, customers are satisfied with the quality and how it makes their hair look and feel.

"...Rinsing out: The shampoo and conditioner both rinse out easily, and my hair feels thicker in the shower--there is a bit of a 'squeaky clean' feel,..." Read more

"For the price, it is really nice. It makes my hair feel fuller and soft. The scent is kinda lacking though." Read more

"...It has been working better than other shampoo I’ve seen advertised as volume boosters...." Read more

"...It still makes my hair look more full, lathers better & doesn’t look dirty. I will probably look for a different option when it’s gone...." Read more

137 customers mention105 positive32 negative

Customers like the smell of the shampoo.

"...The scent is very nice too. If you are scent-sensitive, you may not like this really apparent spicy scent but I enjoyed the experience...." Read more

"...This had great reviews. It doesn't smell "pretty", though not a bad fragrance. It took about 6 weeks to start noticing...." Read more

"...The scent is strong when applying, but does not stay in the hair which I honestly prefer...." Read more

"...It makes my hair feel fuller and soft. The scent is kinda lacking though." Read more

54 customers mention45 positive9 negative

Customers like the effect of the shampoo on their hair. They say it gives good body to their hair, making it appear fuller, thicker, and healthier. Some say it's great for fine hair that needs a lift.

"For the price, it is really nice. It makes my hair feel fuller and soft. The scent is kinda lacking though." Read more

"...It still makes my hair look more full, lathers better & doesn’t look dirty. I will probably look for a different option when it’s gone...." Read more

"...half an inch longer every month on average, and I have experienced little to no hair loss compared to when I used non-biotin shampoos...." Read more

"My hair seems more healthy when I use it." Read more

50 customers mention41 positive9 negative

Customers like the thickness of the shampoo. They say it makes their hair feel thicker, and some say it gives their hair the appearance of being thicker. Some customers also say it adds fullness without compromising texture. Overall, most are satisfied with the product's thickness and quality.

"This shampoo and conditioner really does thicken the hair, keeps it shining and easier to style." Read more

"...You can use it sparingly and it is very thick, smells wonderful and really works great on thin hair!..." Read more

"You really do get fatter hair at least I did. And it's clean too. And shiney and manageable...." Read more

"Provides some body, smells good and very thick." Read more

42 customers mention32 positive10 negative

Customers like the volume of the shampoo. They say it adds volume to their fine hair, thin hair, and thinning hair. They also say it cleans and adds thickness without making hair greasy or heavy. Overall, most recommend the product for its volume and thickness.

"...I appreciate lift, volume, hold, and to be able to work with it through out the week...." Read more

"...I don’t know how, but it works. After only one use, my hair had much more volume...." Read more

"I like it. smells great and adds volume to my fine hair. Would order again." Read more

"...This product did not provide the volume I am seeking. However, it does give hair nice shine, pleasant fragrance and sleek feeing...." Read more

39 customers mention33 positive6 negative

Customers like the style of the shampoo. They say it helps with overall appearance and shine, making their hair look thicker and gorgeous. They also mention that it has a pleasant fragrance and sleek feeling. Overall, most are satisfied with the style.

"...I really am impressed. My hair is shiny and soft and full and stayed that way all day. The scent is very nice too...." Read more

"This shampoo and conditioner really does thicken the hair, keeps it shining and easier to style." Read more

"You really do get fatter hair at least I did. And it's clean too. And shiney and manageable...." Read more

"...However, it does give hair nice shine, pleasant fragrance and sleek feeing...." Read more

38 customers mention38 positive0 negative

Customers find the shampoo comfortable. They say it leaves their hair feeling soft, clean, and shiny with body. Some customers say it gives their hair texture. Overall, most are satisfied with the product's comfort and results.

"...The shampoo and conditioner both rinse out easily, and my hair feels thicker in the shower--there is a bit of a 'squeaky clean' feel, and that helps..." Read more

"For the price, it is really nice. It makes my hair feel fuller and soft. The scent is kinda lacking though." Read more

"...It feels clean and soft so hopefully it holds up and I don’t end up with greasy roots and stringy hair but so far so good!" Read more

"...Leaves your hair looking health, shiny and soft. Is very nice. It has a faint scent of cleanliness and nothing overpowering." Read more

65 customers mention23 positive42 negative

Customers have mixed opinions about the value of the shampoo. Some mention it's worth the price and a great bargain, while others say it'd be better off getting a different product.

"...I delayed buying this shampoo because it is so expensive; but, as it turns out, you only need to use a very small amount of the shampoo so it does..." Read more

"...Is it worth the money…ehh probably not, but if your experimenting with what works for your hair I would at least give this a try." Read more

"...It is a little expensive, but I use it every few washes." Read more

"...It makes your hair so clean, thick, and lustrous. Yes, it's expensive, but you only need a quarter size in your hand to get a full use...." Read more

No more oily hair!
5 Stars
No more oily hair!
So let me start off by saying how much I love this shampoo and conditioner. All my life I have had to wash my hair every day because my scalp gets too oily and therefore itchy. I would scratch my head and get dandruff. No matter how much I tried to train my scalp to skip a wash it never worked. Finally my hair dresser recommended these products and OMG guys, I CAN LITERALLY GO WITHOUT WASHING MY HAIR FOR 3-4 DAYS NOW! My hair doesn’t get excessively oily anymore, no itchiness, and no more dandruff. The best shampoo and conditioner I’ve ever tried! Love it!
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Top reviews from the United States

Kathryn Magendie
5.0 out of 5 stars Skeptical Expectations turned to Happy Results
Reviewed in the United States on July 30, 2023
Size: 0.23 Fl Oz (Pack of 2)Verified Purchase
This shampoo and conditioner gave me such volume for my baby fine thinner hair! I really am impressed. My hair is shiny and soft and full and stayed that way all day. The scent is very nice too. If you are scent-sensitive, you may not like this really apparent spicy scent but I enjoyed the experience. I ordered the sample to try as I've been disappointed before by shampoo and conditioner claims, but this is one I will definitely re-order in the full size.

Lather: Enough lather for me - I'm used to sulfate-free shampoos that don't lather a lot.
Rinsing out: The shampoo and conditioner both rinse out easily, and my hair feels thicker in the shower--there is a bit of a 'squeaky clean' feel, and that helps with baby fine hair.
Look of hair: Very full and my hair even has some body, which it rarely does. Lots of shine.
Feel of hair: soft but not too slippery (baby fine hair can be too slippery sometimes and fall flat). It feels as if I've been to the salon.

Very happy with my order.
47 people found this helpful
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Dog Lover
5.0 out of 5 stars Fuller hair but doesn’t look clean
Reviewed in the United States on November 1, 2023
Verified Purchase
Like other reviewers have stated, it leaves my hair looking sort of greasy or dirty. It doesn’t lather well, but it does make my hair look fuller. I’ve been mixing it half and half in the palm of my hand with another shampoo which seems to work pretty well. It still makes my hair look more full, lathers better & doesn’t look dirty. I will probably look for a different option when it’s gone.

03/29/24 Edit: Turns out I love this shampoo when I mix it with an Aveda shampoo designed to add volume to fine hair. One more tip, I started doing a daily heaping scoop of Vital Proteins over a year ago which helped my hair grow. I’ve actually received compliments on my hair lately and I’ve always had fine, thin, dry hair so to me this is worth the expense of these products! Note that it doesn’t take much of these expensive shampoos, maybe a nickel size of this shampoo with a dime size of the Aveda and that is enough to lather me up. I’ve also had to mix up the conditioners, but that would be a different review.
6 people found this helpful
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BettZZ
5.0 out of 5 stars My hair was falling out! This changed everything!
Reviewed in the United States on April 6, 2024
Size: 8.5 Ounce (Pack of 1)Verified Purchase
I've had so many of my girlfriends notice the difference in my hair that I ought to rep this product lol! My hair was falling out in handfuls and scalp was showing through. Short of a transplant, which I can't afford, I've been trying different biotin based products, with no luck. This had great reviews. It doesn't smell "pretty", though not a bad fragrance. It took about 6 weeks to start noticing. Now, 6 months later I need a haircut every 6-7 weeks! All my spots have filled in, it's amazing.
3 people found this helpful
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Colin
4.0 out of 5 stars Great for Flat Oily Hair
Reviewed in the United States on April 5, 2024
Size: 8.5 Ounce (Pack of 1)Verified Purchase
I’m a guy that gets very oily hair throughout the day which causes my hair to become flat. I do not like my hair flat and prefer to have it fluffy and this shampoo has started to help that process. It has been working better than other shampoo I’ve seen advertised as volume boosters. The scent is strong when applying, but does not stay in the hair which I honestly prefer. Is it worth the money…ehh probably not, but if your experimenting with what works for your hair I would at least give this a try.
One person found this helpful
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June B
5.0 out of 5 stars Nice
Reviewed in the United States on February 24, 2024
Size: 8.5 Ounce (Pack of 1)Verified Purchase
For the price, it is really nice. It makes my hair feel fuller and soft. The scent is kinda lacking though.
2 people found this helpful
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Kendra
3.0 out of 5 stars Snarls and matting
Reviewed in the United States on December 20, 2023
Size: 8.5 Ounce (Pack of 1)Verified Purchase
The shampoo does a good job of cleaning my fine oily hair and it smells ok. My only complaint is that it’s sooo hard to comb through and gets so matted and snarly. I use a dry shampoo called Living Proof to stretch out the time that I need to rewash my hair since I really don’t enjoy washing it with the matting and struggle to comb through it, not to mention how damaging that can be. It has been a real struggle and gets beyond frustrating to find the right shampoo and conditioner but I really recommend trying Living proof products they have really helped me and been a game changer.
4 people found this helpful
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J.Corcoran
5.0 out of 5 stars Good product
Reviewed in the United States on April 11, 2024
Size: 8 Ounce (Pack of 2)Verified Purchase
Works as advertised. Well worth the cost.
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CRG
5.0 out of 5 stars Great shampoo and conditioner
Reviewed in the United States on March 6, 2024
Size: 8 Ounce (Pack of 2)Verified Purchase
This shampoo and conditioner really does thicken the hair, keeps it shining and easier to style.
One person found this helpful
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