OUAI

Hydrating Scalp Serum for Healthy, Fuller Looking Hair

4.2 · 1054 reviews
5,735 ₽

What it is: Healthy hair starts with the scalp. This skincare-inspired serum helps balance and hydrate your scalp to create an ideal environment for hair to thrive.Hair Type: Straight, Wavy, Curly, and CoilyHair Texture: Fine, Medium, and ThickHair Concerns:- Damage, Split Ends, and Breakage- Thinning- Flaky, Dry ScalpKey Benefits: - Fosters a healthy, balanced scalp- Soothes irritation from styling- Promotes the appearance of thicker, fuller hairHighlighted Ingredients:- Adaptogens and Hyaluronic Acid: Promote hydration and a healthy barrier.- Red Clover Flower Extract: Reduces scalp discomfort from styling.- Peptides: Support the appearance of fuller, thicker, and healthier hair.Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also vegan, gluten-free, cruelty-free, and comes in recyclable packaging.What Else You Need to Know: This serum supports the appearance of thicker, healthier hair. Featuring adaptogens like Arctic root, Siberian ginseng, and chaga mushroom combined with hyaluronic acid, this serum promotes hydration and a healthy barrier. It's good for all hair types.Research Results: Based on a 16-week expert grading study performed on 32 subjects- 100% of users showed improvement in the look of fuller, thicker hair- Clinically proven to help improve the overall health of the scalp and  the look of fuller, thicker hair- 90% of users showed improvement in health of their scalpBased on a 12 week consumer study of 115 participants:- 91% of users reported that their hair feels healthier- 87% of users reported a visible improvement in the appearance of their hairFragrance Description: Scented with Cape Town, a calming and earthy fragrance of spearmint, ginger, basil, and green fig.

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What it is: Healthy hair starts with the scalp. This skincare-inspired serum helps balance and hydrate your scalp to create an ideal environment for hair to thrive.Hair Type: Straight, Wavy, Curly, and CoilyHair Texture: Fine, Medium, and ThickHair Concerns:- Damage, Split Ends, and Breakage- Thinning- Flaky, Dry ScalpKey Benefits: - Fosters a healthy, balanced scalp- Soothes irritation from styling- Promotes the appearance of thicker, fuller hairHighlighted Ingredients:- Adaptogens and Hyaluronic Acid: Promote hydration and a healthy barrier.- Red Clover Flower Extract: Reduces scalp discomfort from styling.- Peptides: Support the appearance of fuller, thicker, and healthier hair.Ingredient Callouts: Free of parabens, formaldehydes, formaldehyde-releasing agents, phthalates, mineral oil, retinyl palmitate, oxybenzone, coal tar, hydroquinone, sulfates SLS & SLES, triclocarban, triclosan, and contains less than one percent synthetic fragrance. It is also vegan, gluten-free, cruelty-free, and comes in recyclable packaging.What Else You Need to Know: This serum supports the appearance of thicker, healthier hair. Featuring adaptogens like Arctic root, Siberian ginseng, and chaga mushroom combined with hyaluronic acid, this serum promotes hydration and a healthy barrier. It's good for all hair types.Research Results: Based on a 16-week expert grading study performed on 32 subjects- 100% of users showed improvement in the look of fuller, thicker hair- Clinically proven to help improve the overall health of the scalp and  the look of fuller, thicker hair- 90% of users showed improvement in health of their scalpBased on a 12 week consumer study of 115 participants:- 91% of users reported that their hair feels healthier- 87% of users reported a visible improvement in the appearance of their hairFragrance Description: Scented with Cape Town, a calming and earthy fragrance of spearmint, ginger, basil, and green fig.

Customer reviews

1.0
verified purchase
Can’t believe price increase for the same product

While i have not noticed a significant difference in my hair, I used to purchase this product quite regularly. I’ve noticed that the price used to be $80 and now it’s $90 for the same exact product. Ouai is such an expensive brand and yet they jeep increasing the prices. Ridiculous

10/3/2026
5.0
verified purchase
LOVE this MUST TRY

I bought this because my hair was not doing well and I changed shampoos hair oil etc, so I did not expect much. But boy did it WOW me! I was experiencing more hair falling out due to stress/change of environment, this completely saved me and revived my hair. I went to read other people’s reviews and realized it had this function! I also bought for my mom who always had thin hair, this has worked miracles for both of us and I have emptied bottles after bottles and will keep buying forever!!

9/29/2026
5.0
verified purchase

I almost finished 1 bottle. Its done a great job on my scalp and hair

9/21/2026
4.0
verified purchase

I love, this product, it’s made my hair feel more voluminous and less oily. I wish there was more in a bottle for the price, especially since it’s recommended for everyday use.

8/30/2026
5.0
verified purchase
A must have in my routine

I needed a replacement for my scalp serum found it without any problems. I in and out of the store without any problems.

8/1/2026
1.0
verified purchase
Don’t bother

Get the ordinary peptide density serum and Pantene abundant & strong instead. Because what the actual f is this dropper. Terrible design. And frankly I’m seeing more shedding in the shower when i use this at night.

6/19/2026
1.0
verified purchase

I was soooo consistent with this product because it was so expensive. Used this every day for a full year religiously and was very hopeful. No results :/

6/5/2026
4.0
verified purchase
Amazing and Works

This really works, my hairdresser can verify! I lost hair from breast cancer a few yrs ago. I never grew and started using this, it’s a miracle in a bottle!

3/20/2026
5.0
verified purchase
This has gave me the best hair growth results

I went and had my hair done today with a high end beauty salon, and this is the product I have been using for hair loss, and new hair growth. And my stylist told me I have so much new hair growth so whatever I’m doing keep it up

3/17/2026
5.0
verified purchase

YES, YOUR HAIR WILL GROW. Investment that works. No smell or residue :)

3/7/2026