Milk Hair Serum

Best-selling leave-in conditioner

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℉.

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

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The Hydrate + Hold Kit
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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.

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

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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.

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

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: 4.8408256 / 5 from 1357 reviews.

AI Generated Review Summary

This Milk Hair Serum is praised for its ability to detangle, de-frizz, and deeply moisturize hair without feeling heavy. Customers appreciate its soft, silky texture and the luxurious packaging. The product is also noted for its pleasant scent and its effectiveness in enhancing hair health and shine.

Summary topics

  • Hair Feel (17%): A significant number of customers remarked that the product makes their hair feel amazing, great, soft, and healthy.
  • Packaging (4%): Customers appreciated the beautiful and luxurious packaging of the RŌZ Milk Serum product.
  • Scent (35%): A substantial number of customers appreciated the pleasant smell of the RŌZ Milk Hydrating Leave-In Conditioner Hair Serum.
  • Frizz Control (5%): Customers appreciated the ability of this product to eliminate frizz and provide all-day hydration.

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","customer service","quality","curls","touch","magic"].

Review highlights

  • "My hair feels incredibly soft, smells amazing, and looks healthier than ever." — Leah G.
  • "This serum smells amazing, and makes my hair feel hydrated and nourished." — Laura M.
  • "My hair feels smoother and healthier overall, and the light scent is a nice bonus—subtle but pleasant." — trendyvibesrashi

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 my hair!

"It’s been a long time since I’ve really been happy with an internet purchase. It’s usually hype driven. But i decided to try it because the texture of my hair has changed since i turned 60 ish. I really am enjoying the softer feel, the nice scent, and how much better my hair looks and feels. I’m glad i tried Roz. I’ll most certainly be ordering again,"

— Marti B. (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)

My hair is very fine

"My hair is very fine and wavy. This milk serum does an amazing job letting my hair flaunt its natural waves when applied to towel damped hair, but keeps it beautiful the next day smoothing fly aways! My hair doesn't look oily the 2nd day after, which is so hard to find from other brands. For these reasons, I would recommend this. The smell is sweet and slightly floral, and lasts for a short time."

— Joanna F. (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)

Milk Serum

"Love the serum. Helps my type 4 dense coily hair feel so soft wet or dry. The serum helps detangle as well. The greatest challenge due to the density of my hair, I need to use more than what others might use and will go through the bottle faster which can be costly."

— Materre (4/5)

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)

the goldilocks of products

"this is great no matter how I style my hair - air dry or blow out with a round brush. I have fine, thick hair and like it to look natural. This banishes frizz and gives my hair enough hold to have some texture once it's dry. It combats both fly aways or flat looking hair. Where has this been all of my life?!?"

— Constance C. (5/5)

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)

Q&A

Hair Education

Practical haircare education for consumers and salon professionals, with clear guidance on products, ingredients, washing, styling, and technique.

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