SPF 50+ · PA++++ · Birch Sap Hydration

The anti-aging step you’ll love wearing.

Sun protection that wears like a serum — no white cast, no heaviness. Just skin that ages on its own schedule.

First order: buy one, get one free · Free U.S. shipping over $30
Hayun sun serum on skin
01Highest UVA rating
PA++++ against visible aging
02Zero white cast
Invisible on every skin tone
03Moisturizer built in
One step, most mornings
Birch Moisture Sun Serum texture
The one product

Birch Moisture Sun Serum

★★★★★ Loved by over 20,000 women

SPF 50+ and PA++++ protection in a weightless birch-sap serum, with niacinamide and adenosine working on tone and firmness while the shield is up.

Buy Now Second tube free on your first order
Why we exist

Up to 90% of visible aging is sun, not birthdays.

Cumulative UVA exposure — through clouds, through windows, every single day — is the biggest driver of fine lines, dark spots, and sagging. The most powerful thing you can do for your future skin is the simplest: protect it daily, with something you actually enjoy wearing.

Daily UV protection

From our mornings to yours

★★★★★

“This feels more like a lightweight serum than SPF, absorbs in seconds, and gives my skin the healthiest glow.”

Emily R., verified buyer
★★★★★

“For the first time in years, I'm actually consistent with wearing SPF every single day. It never pills under makeup.”

Sarah K., verified buyer
★★★★★

“I'm in my late 40s — this has become a non-negotiable part of my routine. My skin feels smoother and looks healthier.”

Michelle T., verified buyer
Minji Yoon, founder of Hayun
From the founder

“The best anti-aging product is the sunscreen you’ll actually wear. So I made one worth wearing.”

— Minji Yoon, founder of Hayun

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