"Literally the best hair serum I’ve ever used! It’s not too heavy, but still hydrates my hair perfectly and leaves it feeling so soft and healthy. No question, I will absolutely be buying this again!"
$0 now with try before you buy
Our lightweight hydrating 3-in-1 leave-in is your daily essential for smooth, frizz-free air dries, blow dries, or day 2-3 refreshes. Protects from heat up to 450℉.
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The Hydrate + Hold Kit
$11 Savings
Why we love it:
This versatile styler works on all hair types to detangle, de-frizz, and deeply moisturize, without feeling heavy. Formulated with nourishing BotaniComplex™, Red Algae and Hyaluronic Acid, it leaves hair soft, silky, and protected from heat styling.
100mL / 3.4 Fl. Oz.
Proven Performance
Clinically-tested, pro-grade haircare designed for visible results.
96%
experienced softer hair*
95%
said it reduced the appearance of frizz*
91%
experienced more hydrated hair*
79%
Proven to reduce breakage by up to 79%*
Defends against daily stress from brushing and styling*
Our signature fragrance evokes the spirit of an untamed California garden, verdant and clean, with subtle notes of woody vetiver and fresh, rejuvenating citron.
Notes of bergamot, fig & neroli blossom
Stylist Secret
Use Milk Hair Serum in combination with Santa Lucia Styling Oil on damp and dry hair. Lightweight enough to work on any hair type. Use 2 pumps of Santa Lucia for every 1 pump of Milk.
Mara Roszak
RŌZ Founder and Celebrity Stylist
Clean isn’t a compromise — it’s our standard.
Performance grade
For all hair textures
Clean ingredients
Cruelty-free
Sustainable packaging
Vegan
FAQ
Overall rating: 4.849379 / 5 from 1288 reviews.
AI Generated Review Summary
The Milk Hair Serum is praised for its lightweight hydration, silky hair feel, and healthy, shiny, bouncy look. It effectively smooths frizz without weighing down curls, and customers appreciate its soft, luscious feel and luxurious packaging.
Summary topics
- Packaging (6%): Customers expressed satisfaction with the beautiful and luxurious packaging, which was mentioned multiple times in the reviews.
- Hair Feel (54%): Many customers remarked that the RŌZ Milk Hydrating Leave-In Conditioner Hair Serum makes their hair feel silky.
- Hydration (5%): Customers expressed appreciation for the lightweight and hydrating Milk Hydrating Leave-In Conditioner Hair Serum.
- Hair Look (11%): It was highlighted by customers that this product makes their hair look healthy, shiny, and bouncy.
- Frizz Control (7%): It was reported by customers that this product instantly smoothed out frizz without weighing down their curls.
Review topics: ["size","volume","fragrance","issues","color","absorbs","weight","scent","improvement","design","results","works","quality","feels","benefits","shipping","packaging","texture","look","difference","hair","bottle","hydration","serum","formula","residue","ingredients","leave","style","amount"].
Review highlights
- "My hair feels smoother and healthier overall, and the light scent is a nice bonus—subtle but pleasant." —
- "It has a creamy texture that feels luxurious going on, and my hair absorbs it easily without feeling weighed down." —
- "It’s super lightweight, smells fresh, and makes my hair feel so soft and smooth without weighing it down." —
Reviews
Not perfect for my hair, but still very good!
"I have thin and damaged hair with dry ends. I used the serum on damp hair. + It has a vivid scent, which is something I generally enjoy. + I noticed it surprisingly provides some styling to my hair. + It gave a softer feeling to my hair. - I felt that the serum took away the feeling of having just washed my hair. I would have expected a shinier and softer effect from the serum for this price. However, the smell and the styling help make it unique as a serum."
Beautiful lightweight
"My thin lightweight hair loves this stuff. The packaging is wonderful and fits easily in my to go back for traveling and best of all It has a spa like botanical scent from the essential oils inside the formula and the consistency is wonderful for my hair type . It doesn’t make my hair feeling greasy or weighed down it just feels so soft and smooth to touch. It’s the perfect serum for before and after blow drying for the soft bouncy blowout look."
SO SOFT
"It took a little "training" to get my hair to air dry the way I was wanting, but this certainly helped with frizz and my hair was still so soft, it doesn't feel like there's any product in it, which I love."
Love it!
"I love the Milk Hair Serum! Usually I’m picky with scents and this one is amazing. It’s stronger scented when it goes on but isn’t overpowering when it dries. My hair feels smooth and dries naturally afterwards. Will definitely purchase again."
All products are fantastic
"I have tried almost everything with thick, course hair that gets so frizzy in humidity. The salon I go to started to carry Roz and spoke so highly about all the products. I bought the Milk serum first, then shampoo and conditioner and oil. They are fantastic. And I learned something from Roz, and use more product that I ever used. I followed her directions and am so happy with the results. Just try it, you won't be sorry."
Lightweight Softness Without the Weight
"I have long hair with fine to medium strands, and I use heat tools almost every day, so keeping my hair soft and healthy can be challenging. Many leave-in products tend to weigh my hair down or make it feel greasy, but this serum was different. From the first use, my hair felt incredibly soft, smooth, and lightweight. It helped reduce frizz, made brushing and styling easier, and left my hair looking healthier without losing movement. I love how silky my hair feels while still staying manageable throughout the day."
Amazing Product
"I ordered things that look great on Instagram a lot and sometimes they are very disappointing. This product is delicious and amazing. I am now going to order the shampoo and conditioner because they sent me samples and I love all of it so much it’s oil based so it oils your hair without making it greasy it smells amazing and it makes your hair, soft and healthy. The difference is huge for me"
Frizz control using plant lipids!!
"This is celebrity-stylist favorite hair serum for a reason! It’s beautifully engineered to deliver deep, weightless hydration and frizz control using plant lipids and micro-proteins. I have dry and frizzy ends so something like this is the dream! Formulation-wise, the serum also contains ingredients like panthenol which helps improve hair elasticity. I love the packaging that it comes in and it’s very easy to use! The scent is wonderful too. It truly is great for all hair types - keeping your ends hydrated helps with the issue of split ends! I love that the serum uses natural algae and plant lipids instead of heavy plastics and silicones."
Love!
"I am obsessed with this milk leave-in conditioner hair serum! I have a wavy hair type and definitely added to my hair routine. I apply right after a shower and leaves my hair smooth and soft. The texture is lightweight and application goes a long way. There is a light scent to it not too overpowering. Overall it is very hydrating and recommend for any hair type. This product was provided for promotional purposes in exchange for my honest review."
Q&A
- Is Milk safe to use it with extensions
- Hi Karla! Thank you for your question! Yes, the Milk Hair Serum is completely safe to use on color-treated hair and extensions. We avoid ingredients like sulfates, parabens, cyclic silicones, and drying alcohols, which are the ingredients of most concern with extensions and color treatments. If you have any other questions, feel free to reach out to us directly at hello@rozhair.com! Xx, Team RŌZ
- Hi, How is this different from your conditioner? Can I use this in place of it? I have fine hair and too much product always weighs my hair down. Thanks!
- Hi Julia! Thanks for your question! Our Foundation Conditioner is a rinse-out treatment that hydrates and balances after cleansing, while the Milk Hair Serum is a lightweight leave-in that smooths, hydrates, and protects (up to 450º heat). They’re designed to complement each other — the conditioner works in-shower, and the serum keeps hair smooth and hydrated all day without weighing it down, even on fine hair. Xx, Team RŌZ
- Can it be used on hair with Keratin ?
- Hi Karen! Thanks for your question! Our products are completely safe to use on color and keratin-treated hair. All of our products are vegan, cruelty-free, sulfate-free, paraben-free, triclosan-free, and gluten-free! Our formulas are also free from sodium chloride, the salt most commonly linked to affecting keratin treatments. That said, we always suggest a patch test or checking in with your stylist if you have any specific concerns. Xx, Team RŌZ
- Can I use this to define my waves when I use my diffuser?
- Hi Jodi! Thanks so much for your question! You certainly can use the Milk Hair Serum to prep your hair before diffusing. Milk is formulated to hydrate, smooth frizz, and add subtle definition to your hair's natural texture. Apply 2-3 pumps of Milk on damp, towel-dried hair, focusing on the mid-lengths to ends. Gently comb the product through, and scrunch your ends to help your natural wave come back to life a bit. Then just diffuse as normal! As an added bonus, our Milk Hair Serum protects hair from heat styling up to 450º! Xx, Team RŌZ
- My hair naturally dries very straight and is fine. I love the Air Thickening Spray but am wanting something with a little more moisture and am wondering if the milk serum would be suitable for air drying?
- Hi Anna! Thanks so much for your question. The Milk Hair Serum is our holy-grail for air dry styles! The ultra lightweight formula hydrates, tames frizz, and adds subtle definition to your natural hair texture. It's also perfect for post-styling smoothing and an easy refresh in-between wash days. Xx, Team RŌZ
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