Scalp Serum

"Skincare logic for your scalp. The habit matters more than the adaptogens."
Our take

$54 Price at OUAI, checked Oct 2026.

The short answer

OUAI's Scalp Serum is a leave-in, skincare-inspired serum with adaptogens like Arctic root, Siberian ginseng and chaga mushroom plus hyaluronic acid. It's worth it if your scalp feels dry or tight and you'll commit to daily use. OUAI says the appearance of thicker, healthier hair depends on consistency.

Best for

Thinning Hair

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Picked, never paid for

What it is

OUAI Scalp Serum is a skincare-inspired leave-in serum that helps balance and hydrate the scalp. It is designed to support the appearance of thicker, healthier hair with consistent use.

Key ingredients: Arctic root, Siberian ginseng, chaga mushroom and hyaluronic acid
Format: leave-in serum with a glass pipette
Use daily, AM or PM, on wet or dry hair
Suitable for all hair types

How to use

Apply daily to the scalp, starting at your part and along the hairline, on wet or dry hair. Massage in and don't rinse.

Our Take

Why it made the edit.

Why we love it: It approaches the scalp like skin, which is the right instinct. The pipette makes it easy to target your part and hairline without soaking your hair.
Skip it if: You're dealing with sudden or patchy hair loss, which calls for a dermatologist visit first.
The catch: $54 and a daily commitment. Skip days and you're unlikely to see much.

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