Milk Hair Serum
Milk Hair Serum
Milk Hair Serum
Milk Hair Serum
Milk Hair Serum
Milk Hair Serum
4.8 stars, 1335 reviews
BEST SELLER

Milk Hair Serum

Best-selling leave-in conditioner

A leave-in conditioner and styling serum for air-dries, blowouts and between-wash styling.

450º Heat Safe
Damp or Dry Use
Frizz-Free Air Dry
Size:
Frequency:

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The Hydrate + Hold Kit
The Hydrate + Hold Kit
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Free + Easy Returns

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.

Milk is the leave-in conditioning step. Santa Lucia Styling Oil is a styling oil, while Evergreen Style Cream is a styling cream for sleek shapes and flyaways.

Choose a drying technique with the step-by-step air-dry guide.

On damp hair, apply mid-lengths to ends, before styling. It provides light moisture and smooths dry ends without weighing hair down.

On damp hair, apply mid-lengths to ends and skip your roots. It's lightweight and sinks in fast.

On damp hair, start with one pump on your ends and gradually build from there.

Apply 2–3 pumps to damp hair before styling. It softens strands and calms frizz. Layer Santa Lucia Styling Oil on top for added smoothness.

Apply 2-3 pumps throughout on towel-dried hair before brushing. Air dry or blow dry smooth. Once dry, apply 1-2 pumps to smooth frizz or for a day 2 refresh. Mix 2 pumps Milk Leave-In Conditioner Hair Serum with 1 pump of Santa Lucia Styling Oil for extra hydration.

Aqua / Water, Glycerin, Cetearyl Alcohol, Cetyl Alcohol,Cetrimonium Chloride, Panthenol, Furcellaria Lumbricalis Extract, Vaccinium Myrtillus Seed Oil, Amaranthus Caudatus Seed Extract, Hydrolyzed Chestnut Extract, Hydrolyzed Walnut Extract, Hydroxyacetophenone, Helianthus Annuus Seed Oil / Helianthus Annuus (Sunflower) Seed Oil, Caprylyl Glycol, 1,2-hexanediol, Sodium Gluconate, Hydroxypropyltrimonium Hyaluronate, Sodium Metabisulfite, Tocopheryl Acetate, Bisabolol, Diisostearyl Malate, Limonene, Vitis Vinifera Fruit Extract / Vitis Vinifera Fruit (Grape) Extract, Geraniol, Phenethyl Alcohol, Linalool, Zingiber Officinale Root Extract / Zingiber Officinale (Ginger) Root Extract, Boswellia Serrata Resin Extract, Hydroxycitronellal, Citric Acid, Rosmarinus Officinalis Leaf Extract / Rosmarinus Officinalis (Rosemary) Leaf Extract, Sodium Benzoate, Potassium Sorbate, Parfum / Fragrance

Cosmopolitian Holy Grail Beauty Awards

2025 Marie Claire Skin + Hair Awards

Who What Wear Greatest 100 Hair Products
Before image
After image
Milk Hair Serum Before After

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*

*In a clinical study with expert clinician evaluation

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

The Routine

Milk Hair Serum

Milk Hair Serum

On towel-dried hair, use 2-3 pumps of Milk Hair Serum throughout your mid-lengths to ends.

Santa Lucia Styling Oil

Santa Lucia Styling Oil

Mix just 1-2 pumps of our styling oil with the milk to help smooth frizz. Twist or braid your hair loosely to create soft shapes as your hair dries.

Air Thickening Spray

Air Thickening Spray

Spray all over your hair and scrunch in, building body and letting your natural texture come through

The Difference

Leave-In Cream
Hair Oil / Serum
Heat Protectant
Yes
varies
No
varies
varies
Yes
Yes
No
No
varies
Yes
No
varies
varies
Yes
varies
No
varies
varies
varies
varies

Clean isn’t a compromise — it’s our standard.

Performance grade
For all hair textures
Clean ingredients
Cruelty-free
Sustainable packaging
Vegan

FAQ

Apply 2-3 pumps to damp towel-dried hair, focusing on mid-lengths to ends. Then air-dry or style as usual! Once your hair is dry, apply a touch more Milk to smooth and tame any extra frizz.

Yes—it offers heat protection up to 450°F, so it’s a great prep step before blow drying or styling with hot tools.

It’s a great option if you’re looking for lightweight hydration, softness, and frizz control without heaviness—especially for air-drying or low-maintenance styling.

Yes! The Milk Hair Serum works great on damp or dry hair. Apply a small amount to dry hair in between wash days to refresh your style or add a boost of hydration.

Overall rating: 4.843446 / 5 from 1335 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: [color, feels, packaging, issues, hair, look, texture, scent, bottle, hydration, fragrance, shipping, results, formula, residue, serum, weight, ingredients, style, leave, amount, consistency, absorbs, frizz, oil, quality, customer service, curls, magic, touch].

Review highlights

  • "My hair feels smoother and healthier overall, and the light scent is a nice bonus—subtle but pleasant." — trendyvibesrashi
  • "It has a creamy texture that feels luxurious going on, and my hair absorbs it easily without feeling weighed down." — dmarie160
  • "It’s super lightweight, smells fresh, and makes my hair feel so soft and smooth without weighing it down." — aznlazylady

Reviews

Great product. As I’ve gotten

"Great product. As I’ve gotten older , my curly hair has finer and I have a lot less hair 😞. Now in my 50’s, have been searching for products that dont weigh my hair down , that allow for a nice frizz free definition of curls. Thia product is great. Now just one step , previously used leave in conditioner plus curl cream. doesnt leave hair crunchy or wet looking. Light fragrance. Great for air drying. Havent teied to diffuse. Is a bit costly .. and have to use a bit more product. But overall a great product. Wouls love if a travel Size was available"

— J G. (5/5)

Love, love, love!

"I purchased the shampoo, condition and milk hair serum. I really enjoy the fragrance, it is a nice but not-overpowering femine note. I have very fine hair and super hard water, which don't always mesh well. My hair is noticeably smoother and more manageable. The milk hair serum is a real super star containing frizz!!"

— Sarah B. (5/5)

In LOVE with Roz!

"I cant get over how much I love the Roz Hair Milk! Ive been struggling with hair loss so as part of my new regime, ive stopped using conditioner and replaced it with ROZ. My hair is so soft and shiny and smells like literal heaven. Highly recommend!"

— Michele M. (5/5)

Frizz isn’t gone but it’s less

"I try to be pretty low maintenance with my hair, even so, it still needs something. I’ve found that with the Hair Milk Serum, I can be less particular about mousses and gels because the serum tones down some of the frizz when diffusing. I’d say the main drawback for the product is the scent. I like the smell, but it’s a bit too strong and long lasting. Fortunately, when following up with mousse or gel, the scent seems to reduce a little."

— Heather F. (4/5)

Game Changer

"I've spent about three years looking for a practical, nearly fool proof way to emphasize my wavy hair to the point where it's curly, and ROZ is the best product I've used! I used the mousse and milk and I love, love, love my hair! It was easy to do and after diffusing, I had voluminous, season-two Carrie Bradshaw hair from "Sex and the City" and really, isn't that the goal?"

— Mandi B. (5/5)

"This is the absolute best hair product I have ever owned. I use it daily on both damp and dry hair. It smooths my frizz but does not weigh it down or make it look oily. The smell is light and beautiful. Packaging is chic and elegant. It’s all around my favorite! Cannot recommend it enough!"

— Shannon (5/5)

Luxurious

"Everything about The Hair Serum is absolutely luxurious! The smell, the texture and the shine on my hair after applying the product is absolutely delicious. It's easy to use, not complicated. I have natural pepper hair and at times, my whites would become wirey making my hair difficult to work with. The Hair Serum has solved my problem. I will absolutely be repurchasing."

— Gabriela A. (5/5)

Amazing Product

"The milk hair serum is a game changer. You can use it on wet hair before blow drying, and it can be used as a finishing product for frizz and fly aways, and it doesn't make fine hair greasy. I have bought several bottles over the past few years, and each bottle lasts me almost a year. I highly recommend!"

— Michael V. (5/5)

silky hair

"This is the only product I've ever tried that leaves my otherwise textured wavy hair actually smooth and silky and feels feather light. I can run my fingers through my hair without friction or tangles. I'm 46 with some extremely course gray hair, but with this serum, it feels silky again like I remember in my 20s!"

— Kelly D. (5/5)

As promised

"I purchased both the milk and mousse. Both are true to their word. I have 2b waves and these products helped define the waves pattern without weight and eliminated frizz even after humid days and sweaty stage performances. I get more volume when I diffuse but air drying worked as well. I’ve tried a lot of different products that work well at first, then kinda crap out. But I am having consistent results with Roz. It’s summer and my waves show up better in the summer so I will be interested to see what happens when the weather dries out. But I’m really happy so far!"

— Megan T. (5/5)

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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