Japanese Fermentation Serum with Aged Sake Lees & Rice Ferment
30 mL / 1.0 fl oz · Made in Japan
A lightweight, fragrance-free facial serum created with two exceptional Japanese fermentation ingredients: aged sake lees extract and alcohol-free rice ferment derived from sake.
YuBi is designed for skin that feels dry, looks dull, or has lost some of its natural softness and glow.
Its water-based texture absorbs easily without a heavy or oily finish, leaving skin feeling hydrated, smooth, supple, and comfortable.
C$79
Japanese fermentation, reimagined for modern skin.
For centuries, rice fermentation has been part of Japanese food, beauty, and wellness traditions.
YuBi brings that heritage into a modern facial serum through carefully selected Japanese fermentation ingredients — including sake kasu aged for more than 1,000 hours and an alcohol-free rice ferment made from traditionally brewed junmai sake.
This is not simply a “sake skincare” serum.
It is a formula built around the process of fermentation and the valuable components created from rice, koji, yeast, and time.
What YuBi Helps Support
YuBi is especially suited to skin experiencing:
- Dryness or dehydration
- Dull-looking skin
- Rough or uneven-feeling texture
- Loss of softness and suppleness
- A tired-looking complexion
- A compromised-feeling moisture barrier
With regular use, skin feels more hydrated, smooth, soft, and naturally radiant.
Two Japanese Fermentation Ingredients at the Heart of YuBi
01 — Aged Sake Lees Extract
KOHAKUYUKI
Not ordinary sake kasu.
YuBi contains an extract made from sake kasu produced by a historic Japanese sake brewery.
Fresh sake kasu is further matured at low temperature for more than 1,000 hours through a carefully controlled two-stage fermentation and aging process.
During this maturation, the originally pale sake kasu gradually develops a distinctive amber tone.
The result is KOHAKUYUKI — “Amber Snow”, an aged sake lees extract developed by Japanese cosmetic ingredient specialist Koken together with the sake brewery.
KOHAKUYUKI naturally contains fermentation-derived components including:
- Amino acids
- Natural sugars
- Organic acids
- Glucosylceramide
- Ferulic acid
- α-Ethyl Glucoside (α-EG)
These components make aged sake kasu especially interesting as a Japanese fermentation ingredient for modern skincare.
The amber-colored sake kasu shown above is KOHAKUYUKI’s aged sake lees source material. Image courtesy of Koken Co., Ltd.
Why Age the Sake Kasu for More Than 1,000 Hours?
Fresh sake kasu already contains valuable fermentation-derived components.
But maturation changes it.
According to Koken’s ingredient research, the aging process increases several components present in sake kasu, including amino acids and other fermentation-derived compounds.
This is why YuBi uses aged sake lees extract, rather than relying only on ordinary sake kasu.
It represents something deeply Japanese:
taking time, fermentation, and craftsmanship to create greater value from a traditional ingredient.
Fresh sake kasu vs. aged amber sake kasu
Over time, low-temperature aging transforms fresh sake kasu from a pale cream color into a deeper amber tone, creating the distinctive source material behind KOHAKUYUKI.
02 — Alcohol-Free Rice Ferment
AF SHONAI BIJIN
YuBi also contains an alcohol-free rice ferment made from Japanese sake.
AF SHONAI BIJIN begins with rice grown in Yamagata, Japan and junmai sake brewed using the traditional Kimoto method, one of Japan’s historic sake-brewing techniques.
The cosmetic ingredient is then processed to create an alcohol-free rice ferment suitable for skincare.
It naturally contains components created through rice fermentation, including:
- Amino acids
- D-amino acids
- Natural sugars
- Lactic, malic and succinic acids
- Ferulic acid
- Kojic acid
- Other fermentation-derived components
These naturally occurring compounds contribute to the hydration and conditioning properties that make rice fermentation so compelling in Japanese skincare.
Image courtesy of Koken Co., Ltd.
From a Historic Japanese Sake Brewery to Your Skincare Ritual
The sake and sake kasu behind YuBi’s fermentation ingredients come from a Japanese brewery with approximately 400 years of history.
For us, this matters.
YuBi was not created simply by adding a fashionable “fermented ingredient” to a serum.
We wanted the ingredients to have a real origin — connected to Japanese craftsmanship, sake brewing, rice fermentation, and generations of knowledge.
The same brewery produces both the sake and sake kasu used as the source materials for YuBi’s key fermentation extracts.
Photo: SAKEGLOW founder with the president of the sake brewery behind YuBi’s sake and sake kasu source materials.
What Is α-EG?
A fascinating component created through sake fermentation.
α-EG, or α-Ethyl Glucoside, is a naturally occurring compound associated with sake fermentation.
It has attracted scientific interest in Japan, particularly in research exploring the relationship between sake-derived compounds and skin.
YuBi contains fermentation ingredients that naturally contain α-EG.
Rather than treating α-EG as an isolated “miracle ingredient,” we see it as part of the much larger and more interesting story of Japanese fermentation.
More Than One Ingredient
YuBi combines Japanese fermentation ingredients with a simple group of complementary skincare ingredients.
Hyaluronic Acid
Helps attract and retain moisture, supporting a hydrated and comfortable skin feel.
Equol
A skincare ingredient derived from soy-related research and used in formulas designed for mature-looking skin.
Peony Root Extract
A botanical extract traditionally valued in Japanese and Asian beauty formulations.
Aloe Vera
Helps soothe and condition the skin.
Together with the rice- and sake-derived fermentation ingredients, they create a lightweight serum designed for daily use.
The Texture
Light. Watery. Comfortable.
YuBi was intentionally created without the heavy, oily finish often associated with richer anti-aging serums.
It absorbs quickly and layers easily with the rest of your skincare routine.
Fragrance-free.
Colorant-free.
Ethanol-free.
Oil-free.
No added perfume means you experience the formula without fragrance masking the ingredients.
How to Use
Use morning and evening after cleansing.
Apply a few drops to the face and neck and gently press into the skin.
Follow with moisturizer as needed.
In the morning, finish with sunscreen.
YuBi can also be layered with your existing skincare routine.
When Will I Notice a Difference?
Hydration and softness may be noticeable soon after application.
Changes in the overall look and feel of the skin are better evaluated with consistent use over several weeks.
Skincare is cumulative.
We recommend paying attention not only to how the skin looks immediately after application, but also to how it feels over time — hydration, softness, smoothness, comfort, and natural radiance.
Full Ingredient List
Water, Butylene Glycol, Glycerin, Pentylene Glycol, Oryza Sativa (Rice) Lees Extract, Rice Ferment Filtrate (Sake), Sodium Hyaluronate, Equol, Paeonia Lactiflora Root Extract, Aloe Barbadensis Leaf Extract
Made in Japan.
What YuBi Does Not Contain
- Added fragrance
- Added colorants
- Ethanol
- Mineral oil
- Parabens
- Sulfates
- Phthalates
Why SAKEGLOW Chose Fermentation
Fermentation has always fascinated us because it transforms something simple into something more complex.
Rice becomes sake.
Sake brewing creates sake kasu.
And sake kasu itself can be matured further, developing new characteristics through time and continued fermentation.
SAKEGLOW was created to explore that intersection between Japanese tradition, fermentation science, and modern beauty.
YuBi is our first expression of that philosophy.
Frequently Asked Questions
Does YuBi contain alcohol?
YuBi does not contain ethanol as an intentionally added ingredient.
The rice ferment used in YuBi is Koken’s AF SHONAI BIJIN, an alcohol-free cosmetic ingredient derived from traditionally brewed Japanese sake.
Does YuBi smell like sake?
No.
YuBi is fragrance-free and has virtually no scent.
Is YuBi oily?
No.
YuBi is a lightweight, water-based, oil-free serum.
Can I use YuBi every day?
Yes.
YuBi is designed for daily use, morning and evening.
Can I use it with my moisturizer?
Yes.
YuBi can be applied before moisturizer.
If your skin is dry, we recommend sealing in hydration afterward with the moisturizer that works best for your skin.
Can I use YuBi with other serums?
Yes.
YuBi is designed to layer easily with other skincare products.
When using multiple serums, apply lighter water-based products before richer formulas.
Is YuBi suitable for sensitive skin?
YuBi was created as a gentle, fragrance-free formula.
However, every skin is different. If you have highly reactive skin, patch testing before full-face use is recommended.
Is this a probiotic serum?
No.
YuBi is better described as a Japanese fermentation serum.
Its key ingredients are fermentation-derived cosmetic ingredients; YuBi is not marketed as a live-probiotic skincare product.
A Japanese Fermentation Ritual for Everyday Skin
Japanese skincare does not always need to be complicated.
Sometimes it begins with one beautifully made product, thoughtful ingredients, and consistency.
YuBi Glow Serum brings together aged sake kasu, alcohol-free sake-derived rice ferment, and modern Japanese skincare formulation in one lightweight daily serum.
For skin that feels hydrated, smooth, soft, and naturally luminous.
30 mL · Made in Japan · C$79
Ingredient Photography Credits
Images of KOHAKUYUKI Aged Sake Lees Extract and AF SHONAI BIJIN Rice Ferment used with permission from Koken Co., Ltd.
© Koken Co., Ltd. Used with permission.